diff options
324 files changed, 4346 insertions, 2 deletions
diff --git a/src/browser/UserManual.py b/src/browser/UserManual.py new file mode 100644 index 00000000..fd0d94d9 --- /dev/null +++ b/src/browser/UserManual.py @@ -0,0 +1,20 @@ +from PyQt4 import QtGui,QtCore + + +class UserManual(QtGui.QWidget): + """ + This class creates Welcome page of eSim. + """ + def __init__(self): + QtGui.QWidget.__init__(self) + self.vlayout = QtGui.QVBoxLayout() + + self.browser = QtGui.QTextBrowser() + self.browser.setSource(QtCore.QUrl("../browser/pages/User-Manual/eSim.html")) + self.browser.setOpenExternalLinks(True) + #self.setSource(QtCore.QUrl("../browser/pages/welcome.html")) + #self.setOpenExternalLinks(True) + + self.vlayout.addWidget(self.browser) + self.setLayout(self.vlayout) + self.show()
\ No newline at end of file diff --git a/src/browser/pages/User-Manual/eSim.html b/src/browser/pages/User-Manual/eSim.html new file mode 100644 index 00000000..b98a4fa2 --- /dev/null +++ b/src/browser/pages/User-Manual/eSim.html @@ -0,0 +1,4296 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" + "http://www.w3.org/TR/html4/loose.dtd"> +<html > +<head><title></title> +<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> +<meta name="generator" content="TeX4ht (http://www.cse.ohio-state.edu/~gurari/TeX4ht/)"> +<meta name="originator" content="TeX4ht (http://www.cse.ohio-state.edu/~gurari/TeX4ht/)"> +<!-- html --> +<meta name="src" content="eSim.tex"> +<meta name="date" content="2015-07-31 15:26:00"> +<link rel="stylesheet" type="text/css" href="eSim.css"> +</head><body +> + +<!--l. 62--><p class="indent" > + +<div class="center" +> +<!--l. 1--><p class="noindent" > +<!--l. 2--><p class="noindent" ><span +class="cmbx-12x-x-207">eSim</span><br /><br /> +<span +class="cmbx-12x-x-144">An open source EDA tool for circuit design,</span> +<span +class="cmbx-12x-x-144">simulation, analysis and PCB design</span><br /> + +<img +src="figures/logo-trimmed.png" alt="PIC" +> + +<img +src="figures/iitblogo.png" alt="PIC" +><br /> +Indian Institute of Technology Bombay<br /> +August 2015</div> +<div class="center" +> +<!--l. 22--><p class="noindent" > +<!--l. 23--><p class="noindent" >To<br /> +<span +class="cmr-12">Mr. Narendra Kumar Sinha, IAS</span><br /> +<span +class="cmr-12">An Electronics Engineer and a Bureaucrat,</span><br /> +<span +class="cmr-12">Who dreamt of educating all Indians through NMEICT and</span><br /> +<span +class="cmr-12">Who envisioned and made possible the Aakash Tablet </span></div> + +<!--l. 31--><p class="noindent" > + + +<!--l. 66--><p class="indent" > + + <h2 class="likechapterHead"><a + id="x1-1000"></a>Contents</h2> <div class="tableofcontents"> + <span class="chapterToc" > <a +href="#Q1-1-3">Preface </a></span> +<br /> <span class="chapterToc" > <a +href="#Q1-1-5">Acknowledgements </a></span> +<br /> <span class="chapterToc" > <a +href="#Q1-1-7">List of Acronyms </a></span> +<br /> <span class="chapterToc" >1 <a +href="#x1-50001" id="QQ2-1-8">Introduction</a></span> +<br /> <span class="chapterToc" >2 <a +href="#x1-60002" id="QQ2-1-9">Installing and Setting up eSim</a></span> +<br /> <span class="chapterToc" >3 <a +href="#x1-70003" id="QQ2-1-10">Architecture of eSim</a></span> +<br />  <span class="sectionToc" >3.1 <a +href="#x1-80003.1" id="QQ2-1-11">Modules used in eSim</a></span> +<br />   <span class="subsectionToc" >3.1.1 <a +href="#x1-90003.1.1" id="QQ2-1-12">EEschema</a></span> +<br />   <span class="subsectionToc" >3.1.2 <a +href="#x1-100003.1.2" id="QQ2-1-13">CvPcb</a></span> +<br />   <span class="subsectionToc" >3.1.3 <a +href="#x1-110003.1.3" id="QQ2-1-14">Pcbnew</a></span> +<br />   <span class="subsectionToc" >3.1.4 <a +href="#x1-120003.1.4" id="QQ2-1-15">KiCad to Ngspice converter</a></span> +<br />   <span class="subsectionToc" >3.1.5 <a +href="#x1-180003.1.5" id="QQ2-1-21">Model Builder</a></span> +<br />   <span class="subsectionToc" >3.1.6 <a +href="#x1-190003.1.6" id="QQ2-1-22">Subcircuit Builder</a></span> +<br />   <span class="subsectionToc" >3.1.7 <a +href="#x1-200003.1.7" id="QQ2-1-23">KiCad to Ngspice netlist converter</a></span> +<br />   <span class="subsectionToc" >3.1.8 <a +href="#x1-210003.1.8" id="QQ2-1-24">Ngspice</a></span> +<br />  <span class="sectionToc" >3.2 <a +href="#x1-220003.2" id="QQ2-1-25">Work flow of eSim</a></span> +<br /> <span class="chapterToc" >4 <a +href="#x1-230004" id="QQ2-1-27">Getting Started</a></span> +<br />  <span class="sectionToc" >4.1 <a +href="#x1-240004.1" id="QQ2-1-28">eSim Main Window</a></span> +<br />   <span class="subsectionToc" >4.1.1 <a +href="#x1-250004.1.1" id="QQ2-1-29">Workspace</a></span> +<br />   <span class="subsectionToc" >4.1.2 <a +href="#x1-260004.1.2" id="QQ2-1-31">Main-GUI</a></span> +<br /> <span class="chapterToc" >5 <a +href="#x1-320005" id="QQ2-1-48">Schematic Creation</a></span> +<br />  <span class="sectionToc" >5.1 <a +href="#x1-330005.1" id="QQ2-1-49">Familiarising the Schematic Editor interface</a></span> +<br />   <span class="subsectionToc" >5.1.1 <a +href="#x1-340005.1.1" id="QQ2-1-51">Top menu bar</a></span> +<br />   <span class="subsectionToc" >5.1.2 <a +href="#x1-350005.1.2" id="QQ2-1-53">Top toolbar</a></span> +<br />   <span class="subsectionToc" >5.1.3 <a +href="#x1-360005.1.3" id="QQ2-1-55">Toolbar on the right</a></span> +<br />   <span class="subsectionToc" >5.1.4 <a +href="#x1-370005.1.4" id="QQ2-1-57">Toolbar on the left</a></span> +<br />   <span class="subsectionToc" >5.1.5 <a +href="#x1-380005.1.5" id="QQ2-1-59">Hotkeys</a></span> +<br />  <span class="sectionToc" >5.2 <a +href="#x1-390005.2" id="QQ2-1-60">Schematic creation for simulation</a></span> +<br />   <span class="subsectionToc" >5.2.1 <a +href="#x1-400005.2.1" id="QQ2-1-62">Selection and placement of components</a></span> +<br />   <span class="subsectionToc" >5.2.2 <a +href="#x1-410005.2.2" id="QQ2-1-66">Wiring the circuit</a></span> +<br />   <span class="subsectionToc" >5.2.3 <a +href="#x1-420005.2.3" id="QQ2-1-68">Assigning values to components</a></span> +<br />   <span class="subsectionToc" >5.2.4 <a +href="#x1-430005.2.4" id="QQ2-1-70">Annotation and ERC</a></span> + +<br />   <span class="subsectionToc" >5.2.5 <a +href="#x1-440005.2.5" id="QQ2-1-74">Netlist generation</a></span> +<br /> <span class="chapterToc" >6 <a +href="#x1-450006" id="QQ2-1-76">Simulation</a></span> +<br />  <span class="sectionToc" >6.1 <a +href="#x1-460006.1" id="QQ2-1-77">Analysis Inserter</a></span> +<br />   <span class="subsectionToc" >6.1.1 <a +href="#x1-470006.1.1" id="QQ2-1-79">Types of analysis</a></span> +<br />   <span class="subsectionToc" >6.1.2 <a +href="#x1-510006.1.2" id="QQ2-1-83">DC analysis inserter</a></span> +<br />   <span class="subsectionToc" >6.1.3 <a +href="#x1-520006.1.3" id="QQ2-1-85">AC analysis inserter</a></span> +<br />   <span class="subsectionToc" >6.1.4 <a +href="#x1-530006.1.4" id="QQ2-1-87">Transient analysis inserter</a></span> +<br />  <span class="sectionToc" >6.2 <a +href="#x1-540006.2" id="QQ2-1-89">Adding Source Details</a></span> +<br />  <span class="sectionToc" >6.3 <a +href="#x1-550006.3" id="QQ2-1-92">Adding Ngspice Model</a></span> +<br />  <span class="sectionToc" >6.4 <a +href="#x1-560006.4" id="QQ2-1-93">Adding Device Model Library</a></span> +<br />  <span class="sectionToc" >6.5 <a +href="#x1-570006.5" id="QQ2-1-96">Adding Sub Circuit</a></span> +<br />  <span class="sectionToc" >6.6 <a +href="#x1-580006.6" id="QQ2-1-97">Kicad to Ngspice Conversion</a></span> +<br />  <span class="sectionToc" >6.7 <a +href="#x1-590006.7" id="QQ2-1-99">Simulation</a></span> +<br /> <span class="chapterToc" >7 <a +href="#x1-600007" id="QQ2-1-104">PCB Design</a></span> +<br />  <span class="sectionToc" >7.1 <a +href="#x1-610007.1" id="QQ2-1-105">Schematic creation for PCB design</a></span> +<br />   <span class="subsectionToc" >7.1.1 <a +href="#x1-620007.1.1" id="QQ2-1-107">Netlist generation for PCB</a></span> +<br />   <span class="subsectionToc" >7.1.2 <a +href="#x1-630007.1.2" id="QQ2-1-109">Mapping of components using Footprint Editor</a></span> +<br />   <span class="subsectionToc" >7.1.3 <a +href="#x1-640007.1.3" id="QQ2-1-110">Familiarising the Footprint Editor tool</a></span> +<br />   <span class="subsectionToc" >7.1.4 <a +href="#x1-660007.1.4" id="QQ2-1-114">Viewing footprints in 2D and 3D</a></span> +<br />   <span class="subsectionToc" >7.1.5 <a +href="#x1-670007.1.5" id="QQ2-1-118">Mapping of components in the RC circuit</a></span> +<br />  <span class="sectionToc" >7.2 <a +href="#x1-680007.2" id="QQ2-1-120">Creation of PCB layout</a></span> +<br />   <span class="subsectionToc" >7.2.1 <a +href="#x1-690007.2.1" id="QQ2-1-121">Familiarising the Layout Editor tool</a></span> +<br />   <span class="subsectionToc" >7.2.2 <a +href="#x1-710007.2.2" id="QQ2-1-125">Hotkeys</a></span> +<br />   <span class="subsectionToc" >7.2.3 <a +href="#x1-720007.2.3" id="QQ2-1-126">PCB design example using RC circuit</a></span> +<br /> <span class="chapterToc" >8 <a +href="#x1-730008" id="QQ2-1-141">Model Editor</a></span> +<br />  <span class="sectionToc" >8.1 <a +href="#x1-740008.1" id="QQ2-1-143">Creating New Model Library </a></span> +<br />  <span class="sectionToc" >8.2 <a +href="#x1-750008.2" id="QQ2-1-148">Editing Current Model Library</a></span> +<br />  <span class="sectionToc" >8.3 <a +href="#x1-760008.3" id="QQ2-1-150">Converting Library file to XML file</a></span> +<br /> <span class="chapterToc" >9 <a +href="#x1-770009" id="QQ2-1-151">Sub-Circuit Builder</a></span> +<br />  <span class="sectionToc" >9.1 <a +href="#x1-780009.1" id="QQ2-1-153">Creating a Sub-Circuit</a></span> +<br /> <span class="appendixToc" >A <a +href="#x1-79000A" id="QQ2-1-156">Solved Examples</a></span> +<br />  <span class="sectionToc" >A.1 <a +href="#x1-80000A.1" id="QQ2-1-157">Solved Examples</a></span> +<br />   <span class="subsectionToc" >A.1.1 <a +href="#x1-81000A.1.1" id="QQ2-1-158">Basic RC Circuit</a></span> +<br />   <span class="subsectionToc" >A.1.2 <a +href="#x1-84000A.1.2" id="QQ2-1-167">Half Wave Rectifier</a></span> +<br />   <span class="subsectionToc" >A.1.3 <a +href="#x1-87000A.1.3" id="QQ2-1-177">Inverting Amplifier</a></span> +<br />   <span class="subsectionToc" >A.1.4 <a +href="#x1-90000A.1.4" id="QQ2-1-187">Precision Rectifier</a></span> +<br />   <span class="subsectionToc" >A.1.5 <a +href="#x1-93000A.1.5" id="QQ2-1-198">Half Adder Example</a></span> + </div> + + <h2 class="likechapterHead"><a + id="x1-2000"></a>Preface</h2> <a + id="Q1-1-3"></a> +<!--l. 5--><p class="noindent" >eSim was formerlly known as freeEDA/Oscad. Seeds for eSim were sown when the National +Mission on Education through ICT (NMEICT) was launched: the mission document identified +<span +class="cmti-10x-x-109">Adaption & deployment of open source simulation packages equivalent to Matlab,</span> +<span +class="cmti-10x-x-109">OrCAD, etc.</span>, as one of the areas NMEICT would concentrate on. The FOSSEE +(free and open source software in science and engineering education) group at IIT +Bombay, of which we are a part of, initially started working on Python and Scilab. The +Standing Committee of NMEICT encouraged us to contribute to other open source +software as well. This push helped us develop eSim, an open source alternative to +OrCAD. +<!--l. 18--><p class="indent" > eSim is an electronic design automation (EDA) tool, developed using KiCad and Ngspice. +We have made the netlist files generated by KiCad suitable for simulation through +Ngspice. In order to provide an explanation facility, we have developed a method to +automatically generate differential equations that describe a given analog circuit. +Once satisfied with simulation results, the user can create a Gerber file for PCB +fabrication. +<!--l. 24--><p class="indent" > The FOSSEE team has also created more than 160 Scilab Textbook Companions, +each of which contains Scilab code for worked out examples of standard textbooks, +mostly in engineering and science. These have been created by the students and +professors from various educational institutions in India. These textbooks can be +downloaded free of cost from <span class="cite"> [<span +class="cmbx-10x-x-109">?</span>]</span>. They can also be executed remotely on GARUDA cloud +<span class="cite"> [<span +class="cmbx-10x-x-109">?</span>]</span>. +<!--l. 32--><p class="indent" > We are embarking on a similar methodology for eSim as well: we have solved most of the +worked out examples of <span class="cite"> [<span +class="cmbx-10x-x-109">?</span>]</span> and given the solution in Appendix <a +href="#x1-79000A">A<!--tex4ht:ref: ch:appen --></a>. We hope to create eSim +Textbook Companions for all other relevant standard textbooks as well in the near future, +once again through students and other volunteers. +<!--l. 38--><p class="indent" > Solving the worked out examples of <span class="cite"> [<span +class="cmbx-10x-x-109">?</span>]</span> was a good exercise, as it helped identify and +include some missing features. The yet to be created eSim Textbook Companions +are expected to help in this regard, while simultaneously increasing the available +documentation. +<!--l. 44--><p class="indent" > Lab migration is another important activity that the FOSSEE team is involved in. It +provides equivalent Scilab code for Matlab based labs. This is also carried out through +students and volunteers. We are starting this activity for eSim as well: we will try to provide + +equivalent eSim based solution to all circuit design labs that currently use proprietary +software. +<!--l. 51--><p class="indent" > Another important project supported by NMEICT is the Teach 10,000 Teachers (T10KT) +programme. This methodology, pioneered at IIT Bombay <span class="cite"> [<span +class="cmbx-10x-x-109">?</span>, <span +class="cmbx-10x-x-109">?</span>]</span> has demonstrated that it is +possible for the best people in the field to provide extremely high quality training +to a large number of learners simultaneously. eSim is expected to be used in the +forthcoming T10KT course on Analog Electronics, organised by IIT Kharagpur +<span class="cite"> [<span +class="cmbx-10x-x-109">?</span>]</span>. +<!--l. 60--><p class="indent" > We invite all EDA enthusiasts to work with us through the following resources: +<a + id="x1-2001r1"></a>1. URL for all FOSSEE activities: http://fossee.in <a + id="x1-2002r2"></a>2. URL for all eSim resources: +http://oscad.in <a + id="x1-2003r3"></a>3. Textbook companion: textbook-companion@oscad.in <a + id="x1-2004r4"></a>4. Lab migration: +lab-migration@oscad.in <a + id="x1-2005r5"></a>5. SELF workshops: SELF-workshop@oscad.in <a + id="x1-2006r6"></a>6. eSim +development and enhancing its capabilities: Oscad-dev@oscad.in <a + id="x1-2007r7"></a>7. Feedback on this book: +Oscad-textbook@oscad.in. +We also hope to establish forum based discussion services for eSim. +<!--l. 75--><p class="indent" > Finally, an electronic version of this book is available for noncommercial purposes at +http://oscad.in. + + <h3 class="likesectionHead"><a + id="x1-3000"></a>Acknowledgements</h3> +<a + id="Q1-1-5"></a> +<!--l. 81--><p class="noindent" >We would first like to thank Mr. N. K. Sinha, IAS, for without him, there would +have been no National Mission on Education through ICT (NMEICT), without +which, there would have been no FOSSEE, without which, there would have been +no eSim. The idealistic guiding principles of NMEICT, namely, reliance on open +source software, providing free access to e-content and Internet connectivity for all +educational institutions, egged us to contribute our best and one of the outcomes is +eSim. +<!--l. 90--><p class="indent" > We would like to thank the former Human Resource Development Minister (HRM) Mr. +Arjun Singh for getting NMEICT started. We would like to acknowledge the former HRM Mr. +Kapil Sibal for his unstinting support and the faith he had in the NMEICT administration +team. We would like to thank the current HRM Dr. Pallam Raju for extending the tenure of +NMEICT by five more years. +<!--l. 97--><p class="indent" > We want to thank the Members of the Standing Committee of NMEICT who met once in +two weeks for almost two years to review project proposals and to recommend them for +funding or giving suggestions for improvement. We also want to thank them for urging us to +work on more FOSS systems than what we were prepared for. Without this kind of active +support, the ecosystem required for projects like eSim to flourish, established at IIT +Bombay through the many projects funded through NMEICT, would not have +materialised. +<!--l. 106--><p class="indent" > We want to thank the FOSSEE faculty members Profs. Prabhu Ramachandran, Madhu +Belur, Mani Bhushan, Shiva Gopalakrishnan, Jayendran Venkateswaran, Ashutosh +Mahajan and Supratik Chakraborty for establishing a vibrant FOSSEE group at +IIT Bombay. We want to thank Prof. D. B. Phatak for being a constant source +of inspiration and encouragement and for supporting our activities. We want to +thank other faculty members with NMEICT projects at IIT Bombay, namely, Profs. +Kavi Arya, Ravi Poovaiah, Santosh Noronha, Anil Kulkarni, Sridhar Iyer, Sahana +Murthy and Shishir Jha for sharing their dreams, processes and facilities. We want to +thank the staff members of all NMEICT projects at IIT Bombay in general and of +FOSSEE and Spoken Tutorial projects in particular, for providing a wonderful work +environment. +<!--l. 119--><p class="indent" > We want to thank the IIT Bombay administration in general and R&D office in particular +for providing us with an excellent environment to make us work efficiently. We want to thank +the researchers and faculty members in our departments for providing us with necessary space +and for putting up with our tantrums. +<!--l. 125--><p class="indent" > We would like to thank the professors, staff and students affiliated with the Wadhwani +Electronics lab at IIT Bombay for trying out eSim in lab courses and for the useful +suggestions. We would like to thank Abhishek Pawar for creating Spoken Tutorials on KiCad. +We would like to thank Saket Choudhary for making the netlist files generated by KiCad + +compatible with Ngspice.<br +class="newline" /> +<div class="center" +> +<!--l. 134--><p class="noindent" > +<div class="tabular"> <table id="TBL-1" class="tabular" +cellspacing="0" cellpadding="0" +><colgroup id="TBL-1-1g"><col +id="TBL-1-1"><col +id="TBL-1-2"><col +id="TBL-1-3"></colgroup><tr + style="vertical-align:baseline;" id="TBL-1-1-"><td style="white-space:nowrap; text-align:center;" id="TBL-1-1-1" +class="td11"></td><td style="white-space:nowrap; text-align:center;" id="TBL-1-1-2" +class="td11">Kannan M. Moudgalya</td> +</tr><tr +class="vspace" style="font-size:14.22636pt"><td +> </td><td +> </td><td +> </td></tr><tr + style="vertical-align:baseline;" id="TBL-1-2-"><td style="white-space:nowrap; text-align:center;" id="TBL-1-2-1" +class="td11"> </td><td style="white-space:nowrap; text-align:center;" id="TBL-1-2-2" +class="td11"> IIT Bombay </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-1-3-"><td style="white-space:nowrap; text-align:center;" id="TBL-1-3-1" +class="td11"> </td><td style="white-space:nowrap; text-align:center;" id="TBL-1-3-2" +class="td11"> 22 August 2015 </td></tr></table> +</div></div> + + <h3 class="likesectionHead"><a + id="x1-4000"></a>List of Acronyms</h3> +<a + id="Q1-1-7"></a> + <div class="tabular"> <table id="TBL-2" class="tabular" +cellspacing="0" cellpadding="0" +><colgroup id="TBL-2-1g"><col +id="TBL-2-1"><col +id="TBL-2-2"></colgroup><tr + style="vertical-align:baseline;" id="TBL-2-1-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-1-1" +class="td11"> </td></tr><tr + style="vertical-align:baseline;" id="TBL-2-2-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-2-1" +class="td11">ADC</td><td style="white-space:wrap; text-align:left;" id="TBL-2-2-2" +class="td11"><!--l. 4--><p class="noindent" >Analog to Digital Converter </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-3-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-3-1" +class="td11">BJT </td><td style="white-space:wrap; text-align:left;" id="TBL-2-3-2" +class="td11"><!--l. 5--><p class="noindent" >Bipolar Junction Transistor </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-4-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-4-1" +class="td11">BV </td><td style="white-space:wrap; text-align:left;" id="TBL-2-4-2" +class="td11"><!--l. 6--><p class="noindent" >Breakdown Voltage </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-5-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-5-1" +class="td11">CCCS </td><td style="white-space:wrap; text-align:left;" id="TBL-2-5-2" +class="td11"><!--l. 7--><p class="noindent" >Current Controlled Current Source </td></tr><tr + style="vertical-align:baseline;" id="TBL-2-6-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-6-1" +class="td11">CCVS </td> <td style="white-space:wrap; text-align:left;" id="TBL-2-6-2" +class="td11"><!--l. 8--><p class="noindent" >Current Controlled Voltage Source</td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-7-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-7-1" +class="td11">CPU </td><td style="white-space:wrap; text-align:left;" id="TBL-2-7-2" +class="td11"><!--l. 9--><p class="noindent" >Central Processing Unit </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-8-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-8-1" +class="td11">DAC </td><td style="white-space:wrap; text-align:left;" id="TBL-2-8-2" +class="td11"><!--l. 10--><p class="noindent" >Digital to Analog Converter </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-9-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-9-1" +class="td11">DRC </td><td style="white-space:wrap; text-align:left;" id="TBL-2-9-2" +class="td11"><!--l. 11--><p class="noindent" >Design Rules Check </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-10-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-10-1" +class="td11">DXF </td><td style="white-space:wrap; text-align:left;" id="TBL-2-10-2" +class="td11"><!--l. 12--><p class="noindent" >Drawing Interchange Format or Drawing Exchange Format </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-11-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-11-1" +class="td11">EDA </td><td style="white-space:wrap; text-align:left;" id="TBL-2-11-2" +class="td11"><!--l. 13--><p class="noindent" >Electronic Design Automation </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-12-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-12-1" +class="td11">ERC </td><td style="white-space:wrap; text-align:left;" id="TBL-2-12-2" +class="td11"><!--l. 14--><p class="noindent" >Electric Rules Check </td></tr><tr + style="vertical-align:baseline;" id="TBL-2-13-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-13-1" +class="td11">FOSS </td> <td style="white-space:wrap; text-align:left;" id="TBL-2-13-2" +class="td11"><!--l. 15--><p class="noindent" >Free and Open Source Software</td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-14-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-14-1" +class="td11">FPGA </td><td style="white-space:wrap; text-align:left;" id="TBL-2-14-2" +class="td11"><!--l. 16--><p class="noindent" >Field Programmable Gate Array </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-15-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-15-1" +class="td11">gEDA </td><td style="white-space:wrap; text-align:left;" id="TBL-2-15-2" +class="td11"><!--l. 17--><p class="noindent" >Electronic Design Automation released under GPL </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-16-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-16-1" +class="td11">GUI </td><td style="white-space:wrap; text-align:left;" id="TBL-2-16-2" +class="td11"><!--l. 18--><p class="noindent" >Graphical User Interface </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-17-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-17-1" +class="td11">HDL </td><td style="white-space:wrap; text-align:left;" id="TBL-2-17-2" +class="td11"><!--l. 19--><p class="noindent" >Hardware Descrition Language </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-18-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-18-1" +class="td11">HPGL </td><td style="white-space:wrap; text-align:left;" id="TBL-2-18-2" +class="td11"><!--l. 20--><p class="noindent" >Hewlett-Packard Graphics Language </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-19-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-19-1" +class="td11">IC </td><td style="white-space:wrap; text-align:left;" id="TBL-2-19-2" +class="td11"><!--l. 21--><p class="noindent" >Integrated Circuit </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-20-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-20-1" +class="td11">ICT </td><td style="white-space:wrap; text-align:left;" id="TBL-2-20-2" +class="td11"><!--l. 22--><p class="noindent" >Information and Communication Technology </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-21-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-21-1" +class="td11">IGBT </td><td style="white-space:wrap; text-align:left;" id="TBL-2-21-2" +class="td11"><!--l. 23--><p class="noindent" >Insulated Gate Bipolar Transistor </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-22-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-22-1" +class="td11">JFET </td><td style="white-space:wrap; text-align:left;" id="TBL-2-22-2" +class="td11"><!--l. 24--><p class="noindent" >Junction Field Effect Transistor </td></tr><tr + style="vertical-align:baseline;" id="TBL-2-23-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-23-1" +class="td11">KCE </td> <td style="white-space:wrap; text-align:left;" id="TBL-2-23-2" +class="td11"><!--l. 25--><p class="noindent" >Kirchoff’s Current Law</td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-24-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-24-1" +class="td11">KVE </td><td style="white-space:wrap; text-align:left;" id="TBL-2-24-2" +class="td11"><!--l. 26--><p class="noindent" >Kirchoff’s Voltage Law </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-25-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-25-1" +class="td11">LXDE </td><td style="white-space:wrap; text-align:left;" id="TBL-2-25-2" +class="td11"><!--l. 27--><p class="noindent" >Lightweight X11 Desktop Environment </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-26-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-26-1" +class="td11">MNA </td><td style="white-space:wrap; text-align:left;" id="TBL-2-26-2" +class="td11"><!--l. 28--><p class="noindent" >Modified Nodal Analysis </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-27-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-27-1" +class="td11">MOSFET</td><td style="white-space:wrap; text-align:left;" id="TBL-2-27-2" +class="td11"><!--l. 29--><p class="noindent" >Metal Oxide Semiconductor Field Effect Transistor </td></tr><tr + style="vertical-align:baseline;" id="TBL-2-28-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-28-1" +class="td11">NMEICT </td> <td style="white-space:wrap; text-align:left;" id="TBL-2-28-2" +class="td11"><!--l. 30--><p class="noindent" >National Mission on Education through ICT</td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-29-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-29-1" +class="td11">Op-amp </td><td style="white-space:wrap; text-align:left;" id="TBL-2-29-2" +class="td11"><!--l. 31--><p class="noindent" >Operational Amplifier </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-30-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-30-1" +class="td11">OTC </td><td style="white-space:wrap; text-align:left;" id="TBL-2-30-2" +class="td11"><!--l. 32--><p class="noindent" >Oscad Textbook Companion </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-31-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-31-1" +class="td11">PCB </td><td style="white-space:wrap; text-align:left;" id="TBL-2-31-2" +class="td11"><!--l. 33--><p class="noindent" >Printed Circuit Board </td></tr><tr + style="vertical-align:baseline;" id="TBL-2-32-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-32-1" +class="td11">RS </td> <td style="white-space:wrap; text-align:left;" id="TBL-2-32-2" +class="td11"><!--l. 34--><p class="noindent" >Ohmic Resistance</td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-33-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-33-1" +class="td11">SELF </td><td style="white-space:wrap; text-align:left;" id="TBL-2-33-2" +class="td11"><!--l. 35--><p class="noindent" >Spoken Tutorial based Education and Learning through Free +FOSS study </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-34-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-34-1" +class="td11">SMCSim </td><td style="white-space:wrap; text-align:left;" id="TBL-2-34-2" +class="td11"><!--l. 36--><p class="noindent" >Scilab based Mini Circuit Simulator </td></tr><tr + style="vertical-align:baseline;" id="TBL-2-35-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-35-1" +class="td11">SVF </td> <td style="white-space:wrap; text-align:left;" id="TBL-2-35-2" +class="td11"><!--l. 37--><p class="noindent" >Serial Vector Format</td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-36-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-36-1" +class="td11">T10KT </td><td style="white-space:wrap; text-align:left;" id="TBL-2-36-2" +class="td11"><!--l. 38--><p class="noindent" >Teach 10,000 Teachers </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-37-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-37-1" +class="td11">VCCS </td><td style="white-space:wrap; text-align:left;" id="TBL-2-37-2" +class="td11"><!--l. 39--><p class="noindent" >Voltage Controlled Current Source </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-38-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-38-1" +class="td11">VCVS </td><td style="white-space:wrap; text-align:left;" id="TBL-2-38-2" +class="td11"><!--l. 40--><p class="noindent" >Voltage Controlled Voltage source </td> +</tr><tr + style="vertical-align:baseline;" id="TBL-2-39-"><td style="white-space:nowrap; text-align:left;" id="TBL-2-39-1" +class="td11"> </td> </tr></table></div> + +<!--l. 73--><p class="indent" > + + +<!--l. 8--><p class="indent" > + + <h2 class="chapterHead"><span class="titlemark">Chapter 1</span><br /><a + id="x1-50001"></a>Introduction</h2> Electronic systems are an integral part of human life. They have +simplified our lives to a great extent. Starting from small systems made of a few +discrete components to the present day integrated circuits (ICs) with millions of +logic gates, electronic systems have undergone a sea change. As a result, design of +electronic systems too have become extremely difficult and time consuming. Thanks to +a host of computer aided design tools, we have been able to come up with quick +and efficient designs. These are called <span +class="cmtt-10x-x-109">Electronic Design Automation </span>or <span +class="cmtt-10x-x-109">EDA</span> +<a + id="dx1-5001"></a>tools. +<!--l. 20--><p class="noindent" >Let us see the steps involved in EDA.<a + id="dx1-5002"></a> In the first stage, the specifications of the system are +laid out. These specifications are then converted to a design. The design could be in +the form of a circuit schematic, logical description using an HDL language, etc. +The design is then simulated and re-designed, if needed, to achieve the desired +results. Once simulation achieves the specifications, the design is either converted to +a PCB, a chip layout, or ported to an FPGA. The final product is again tested +for specifications. The whole cycle is repeated until desired results are obtained +<span class="cite"> [<span +class="cmbx-10x-x-109">?</span>]</span>. +<!--l. 31--><p class="indent" > A person who builds an electronic system has to first design the circuit, produce a virtual +representation of it through a schematic for easy comprehension, simulate it and finally +convert it into a Printed Circuit Board (PCB). <a + id="dx1-5003"></a>There are various tools available that help do +this. Some of the popular EDA tools are those of <span +class="cmtt-10x-x-109">Cadence</span>, <span +class="cmtt-10x-x-109">Synopys</span>, <span +class="cmtt-10x-x-109">Mentor Graphics </span>and +<span +class="cmtt-10x-x-109">Xilinx</span>. Although these are fairly comprehensive and high end, their licences are expensive, +being proprietary. +<!--l. 40--><p class="indent" > There are some free and open source EDA tools like <span +class="cmtt-10x-x-109">gEDA</span>, <span +class="cmtt-10x-x-109">KiCad </span>and <span +class="cmtt-10x-x-109">Ngspice</span>. The main +drawback of these open source tools is that they are not comprehensive. Some of them are +capable of PCB design (e.g. <span +class="cmtt-10x-x-109">KiCad</span>) while some of them are capable of performing simulations +(e.g. <span +class="cmtt-10x-x-109">gEDA</span>). To the best of our knowledge, there is no open source software that can perform +circuit design, simulation and layout design together. eSim is capable of doing all of the +above. +<!--l. 49--><p class="indent" > eSim is a free and open source EDA tool. It is an acronym for <span +class="cmbx-10x-x-109">O</span>pen <span +class="cmbx-10x-x-109">s</span>ource <span +class="cmbx-10x-x-109">c</span>omputer +<span +class="cmbx-10x-x-109">a</span>ided <span +class="cmbx-10x-x-109">d</span>esign. eSim is created using open source software packages, such as KiCad, Ngspice, +Scilab and Python. <a + id="dx1-5004"></a><a + id="dx1-5005"></a> <a + id="dx1-5006"></a><a + id="dx1-5007"></a> Using eSim, one can create circuit schematics, perform simulations +and design PCB layouts. It can create or edit new device models, and create or +edit subcircuits for simulation. It also has a Scilab based Mini Circuit Simulator +(SMCSim), <a + id="dx1-5008"></a>which is capable of giving the circuit equations for each simulation +step. This feature is unique to eSim. Because of these reasons, eSim is expected to +be useful to students, teachers and other professionals who would want to study +and/or design electronic systems. eSim is also useful for entrepreneurs and small scale +enterprises who do not have the capability to invest in heavily priced proprietary +tools. +<!--l. 66--><p class="indent" > This book introduces eSim to the reader and illustrates all the features of eSim with +examples. Chapter <span +class="cmbx-10x-x-109">??</span> gives step by step instructions to install eSim on a typical computer + +system and to validate the installation. The software architecture of eSim is presented in +Chapter <a +href="#x1-70003">3<!--tex4ht:ref: chap3 --></a>. Chapter <a +href="#x1-230004">4<!--tex4ht:ref: chap4 --></a> gets the user started with eSim. It takes them through a tour of eSim +with the help of a simple RC circuit example. Chapter <a +href="#x1-320005">5<!--tex4ht:ref: chap5 --></a> explains how to create circuit +schematics using eSim, in detail using examples. Chapter <a +href="#x1-450006">6<!--tex4ht:ref: chap6 --></a> illustrates how to simulate +circuits using eSim. Chapter <a +href="#x1-600007">7<!--tex4ht:ref: chap7 --></a> explains PCB design using eSim, in detail. The advanced +features of eSim such as Model Builder covered in Chapter <span +class="cmbx-10x-x-109">??</span> and Sub circuiting is +covered in Chapter <span +class="cmbx-10x-x-109">??</span>. Appendix <a +href="#x1-79000A">A<!--tex4ht:ref: ch:appen --></a> presents examples, that have been worked +out using eSim, from the book <span +class="cmtt-10x-x-109">Microelectronic Circuits </span>by Sedra and Smith +<span class="cite"> [<span +class="cmbx-10x-x-109">?</span>]</span>. Appendix <span +class="cmbx-10x-x-109">??</span> explains the resources available for the use and promotion of +eSim. +<!--l. 79--><p class="indent" > The following convention has been adopted throughout this book. All the menu names, +options under each menu item, tool names, certain points to be noted, etc., are given in +<span +class="cmti-10x-x-109">italics</span>. Some keywords, names of certain windows/dialog boxes, names of some +files/projects/folders, messages displayed during an activity, names of websites, component +references, etc., are given in <span +class="cmtt-10x-x-109">typewriter </span>font. Some key presses, e.g. <span +class="cmtt-10x-x-109">Enter </span>key, <span +class="cmtt-10x-x-109">F1 </span>key, <span +class="cmtt-10x-x-109">y </span>for +yes, etc., are also mentioned in <span +class="cmtt-10x-x-109">typewriter </span>font. + + <h2 class="chapterHead"><span class="titlemark">Chapter 2</span><br /><a + id="x1-60002"></a>Installing and Setting up eSim</h2> + +<!--l. 2--><p class="indent" > + + <h2 class="chapterHead"><span class="titlemark">Chapter 3</span><br /><a + id="x1-70003"></a>Architecture of eSim</h2> +<!--l. 6--><p class="noindent" >eSim is a CAD <a + id="dx1-7001"></a>tool that helps electronic system designers to design, test and analyse their +circuits. But the important feature of this tool is that it is open source and hence the user can +modify the source as per his/her need. The software provides a generic, modular and +extensible platform for experiment with electronic circuits. This software runs on all +Ubuntu Linux distributions. It uses <span +class="cmtt-10x-x-109">Python</span>, <span +class="cmtt-10x-x-109">KiCad</span>, <span +class="cmtt-10x-x-109">Ngspice </span>and <span +class="cmtt-10x-x-109">Scilab </span>(5.4.0 or +above). +<!--l. 15--><p class="indent" > The objective behind the development of eSim is to provide an open source EDA solution +for electronics and electrical engineers. The software should be capable of performing +schematic creation, PCB design and circuit simulation (analog, digital and mixed signal). It +should provide facilities to create new models and components. In addition to this, it should +have the capability to explain the circuit by giving symbolic equations and numerical +values. The architecture of eSim has been designed by keeping these objectives in +mind. + <h3 class="sectionHead"><span class="titlemark">3.1 </span> <a + id="x1-80003.1"></a>Modules used in eSim</h3> +<!--l. 25--><p class="noindent" >Various open-source tools have been used for the underlying build-up of eSim. In this section +we will give a brief idea about all the modules used in eSim. +<!--l. 27--><p class="noindent" > + <h4 class="subsectionHead"><span class="titlemark">3.1.1 </span> <a + id="x1-90003.1.1"></a>EEschema</h4> +<a + id="dx1-9001"></a> +<a + id="dx1-9002"></a> +<!--l. 28--><p class="noindent" >EEschema is an integrated software where all functions of circuit drawing, control, layout, +library management and access to the PCB design software are carried out within itself. It is +the schematic editor tool used in KiCad <span class="cite"> [<span +class="cmbx-10x-x-109">?</span>]</span>. EEschema is intended to work with PCB layout +software such as Pcbnew. It provides netlist that describes the electrical connections of the +PCB. EEschema also integrates a component editor which allows the creation, editing and +visualisation of components. It also allows the user to effectively handle the symbol +libraries i.e; import, export, addition and deletion of library components. EEschema +also integrates the following additional but essential functions needed for a modern +schematic capture software: <a + id="x1-9003r1"></a>1. Design rules check <a + id="dx1-9004"></a>(<span +class="cmtt-10x-x-109">DRC</span>) for the automatic control of +incorrect connections and inputs of components left unconnected. <a + id="x1-9005r2"></a>2. Generation of +layout files in <span +class="cmtt-10x-x-109">POSTSCRIPT</span> <a + id="dx1-9006"></a>or <span +class="cmtt-10x-x-109">HPGL</span> <a + id="dx1-9007"></a>format. <a + id="x1-9008r3"></a>3. Generation of layout files printable via +printer. <a + id="x1-9009r4"></a>4. Bill of material generation. <a + id="x1-9010r5"></a>5. Netlist generation for PCB layout or for +simulation. +This module is indicated by the label 1 in Fig. <a +href="#x1-220011">3.1<!--tex4ht:ref: blockd --></a>. +<!--l. 49--><p class="indent" > As Eeschema is originally intended for PCB Design, there are no fictitious + +components<span class="footnote-mark"><a +href="eSim2.html#fn1x3"><sup class="textsuperscript">1</sup></a></span><a + id="x1-9011f1"></a> +such as voltage or current sources. Thus, we have added a new library for different types of +voltage and current sources such as sine, pulse and square wave. We have also built a library +which gives printing and plotting solutions. This extension, developed by us for eSim, is +indicated by the label 2 in Fig. <a +href="#x1-220011">3.1<!--tex4ht:ref: blockd --></a>. + <h4 class="subsectionHead"><span class="titlemark">3.1.2 </span> <a + id="x1-100003.1.2"></a>CvPcb</h4> +<a + id="dx1-10001"></a> +<!--l. 62--><p class="noindent" >CvPcb is a tool that allows the user to associate components in the schematic to component +footprints when designing the printed circuit board. CvPcb is the footprint editor tool in +KiCad <span class="cite"> [<span +class="cmbx-10x-x-109">?</span>]</span>. Typically the netlist file generated by EEschema does not specify which printed +circuit board footprint is associated with each component in the schematic. However, this is +not always the case as component footprints can be associated during schematic capture by +setting the component’s footprint field. CvPcb provides a convenient method of associating +footprints to components. It provides footprint list filtering, footprint viewing, and 3D +component model viewing to help ensure that the correct footprint is associated with each +component. Components can be assigned to their corresponding footprints manually or +automatically by creating equivalence files. Equivalence files are look up tables +associating each component with its footprint. This interactive approach is simpler +and less error prone than directly associating footprints in the schematic editor. +This is because CvPcb not only allows automatic association, but also allows to +see the list of available footprints and displays them on the screen to ensure the +correct footprint is being associated. This module is indicated by the label 3 in +Fig. <a +href="#x1-220011">3.1<!--tex4ht:ref: blockd --></a>. +<!--l. 84--><p class="noindent" > + <h4 class="subsectionHead"><span class="titlemark">3.1.3 </span> <a + id="x1-110003.1.3"></a>Pcbnew</h4> +<a + id="dx1-11001"></a> +<!--l. 85--><p class="noindent" >Pcbnew is a powerful printed circuit board software tool. It is the layout editor tool +used in KiCad <span class="cite"> [<span +class="cmbx-10x-x-109">?</span>]</span>. It is used in association with the schematic capture software +EEschema, which provides the netlist. Netlist describes the electrical connections of +the circuit. CvPcb is used to assign each component, in the netlist produced by +EEschema, to a module that is used by Pcbnew. The features of Pcbnew are given +below: + + <ul class="itemize1"> + <li class="itemize">It manages libraries of modules. Each module is a drawing of the physical + component including its footprint<a + id="dx1-11002"></a> - the layout of pads providing connections to the + component. The required modules are automatically loaded during the reading of + the netlist produced by CvPcb. + </li> + <li class="itemize">Pcbnew integrates automatically and immediately any circuit modification by + removal of any erroneous tracks, addition of new components, or by modifying + any value (and under certain conditions any reference) of the old or new modules, + according to the electrical connections appearing in the schematic. + </li> + <li class="itemize">This tool provides a rats nest display, a hairline connecting the pads of modules + connected on the schematic. These connections move dynamically as track and + module movements are made. + </li> + <li class="itemize">It has an active Design Rules Check (<span +class="cmtt-10x-x-109">DRC</span>) which automatically indicates any error + of track layout in real time. + </li> + <li class="itemize">It automatically generates a copper plane, with or without thermal breaks on the + pads. + </li> + <li class="itemize">It has a simple but effective auto router to assist in the production of the + circuit. An export/import in <span +class="cmtt-10x-x-109">SPECCTRA </span>dsn format allows to use more advanced + auto-routers. + </li> + <li class="itemize">It provides options specifically for the production of ultra high frequency circuits + (such as pads of trapezoidal and complex form, automatic layout of coils on the + printed circuit). + </li> + <li class="itemize">Pcbnew displays the elements (tracks, pads, texts, drawings and more) as actual size + and according to personal preferences such as: + <ul class="itemize2"> + <li class="itemize">display in full or outline. + </li> + <li class="itemize">display the track/pad clearance.</li></ul> + + </li></ul> +<!--l. 125--><p class="noindent" >This module is indicated by the label 4 in Fig. <a +href="#x1-220011">3.1<!--tex4ht:ref: blockd --></a>. + <h4 class="subsectionHead"><span class="titlemark">3.1.4 </span> <a + id="x1-120003.1.4"></a>KiCad to Ngspice converter</h4> +<!--l. 128--><p class="noindent" >It converts KiCad generated netlists to Ngspice compatible format. Also it facilitates adding +model library of components and subcircuits. Following are the different functionality lies +under conversion. + <h5 class="subsubsectionHead"><a + id="x1-130003.1.4"></a>Analysis Inserter</h5> +<!--l. 130--><p class="noindent" >This feature helps the user to perform different types of analysis such as Operating +point analysis, <a + id="dx1-13001"></a>DC analysis, <a + id="dx1-13002"></a>AC analysis, <a + id="dx1-13003"></a>transient analysis, <a + id="dx1-13004"></a>etc. It has the facility +to + <ul class="itemize1"> + <li class="itemize">Insert type of analysis such as AC or DC or Transient + </li> + <li class="itemize">Insert values for analysis</li></ul> +<!--l. 139--><p class="noindent" > + <h5 class="subsubsectionHead"><a + id="x1-140003.1.4"></a>Source Details</h5> +<!--l. 140--><p class="noindent" >eSim sources are added from eSim-sources package. Sources auch as SINE, AC, DC, PULSE +are in this lobrary. Input to allthe sources adde in the circuit are given in source +details. + <h5 class="subsubsectionHead"><a + id="x1-150003.1.4"></a>Ngspice Model</h5> +<!--l. 142--><p class="noindent" >eSim adds Ngspice model using this facility. + <h5 class="subsubsectionHead"><a + id="x1-160003.1.4"></a>Device Modeling</h5> +<!--l. 144--><p class="noindent" >Devices like Diode, JFET, MOSFET, IGBT, MOS etc added in the circut can be modeled +using device model libraries. eSim also proveides editing and adding new model libraries. +While converting Kicad to Ngspice these library files added to the corresponding devices uesd +in the circuit. + + <h5 class="subsubsectionHead"><a + id="x1-170003.1.4"></a>Subcircuits</h5> +<!--l. 146--><p class="noindent" >Subcircuits are the circuits within a circuits. Subcircuiting helps to reuse the part of the +circuits. The sub circuit in the main circuits are added using this facility. Also, eSim provides +us with editing the already exixting subcircuits. Sub circuits are saved separately in different +folders. + <h4 class="subsectionHead"><span class="titlemark">3.1.5 </span> <a + id="x1-180003.1.5"></a>Model Builder</h4> +<a + id="dx1-18001"></a> +<!--l. 149--><p class="noindent" >This tool provides the facility to define a new model for devices such as, <a + id="x1-18002r1"></a>1. Diode <a + id="x1-18003r2"></a>2. Bipolar +Junction Transistor (BJT) <a + id="x1-18004r3"></a>3. Metal Oxide Semiconductor Field Effect Transistor +(MOSFET) <a + id="x1-18005r4"></a>4. Junction Field Effect Transistor (JFET) <a + id="x1-18006r5"></a>5. IGBT and <a + id="x1-18007r6"></a>6. Magnetic +core. +This module also helps edit existing models. It is developed by us for eSim and it is indicated +by the label 5 in Fig. <a +href="#x1-220011">3.1<!--tex4ht:ref: blockd --></a>. +<!--l. 163--><p class="noindent" > + <h4 class="subsectionHead"><span class="titlemark">3.1.6 </span> <a + id="x1-190003.1.6"></a>Subcircuit Builder</h4> +<a + id="dx1-19001"></a> +<!--l. 163--><p class="noindent" >This module allows the user to create a subcircuit for a component. Once the subcircuit for a +component is created, the user can use it in other circuits. It has the facility to define new +components such as, Op-amps and IC-555. This component also helps edit existing +subcircuits. This module is developed by us for eSim and it is indicated by the label 6 in +Fig. <a +href="#x1-220011">3.1<!--tex4ht:ref: blockd --></a>. +<!--l. 171--><p class="noindent" > + <h4 class="subsectionHead"><span class="titlemark">3.1.7 </span> <a + id="x1-200003.1.7"></a>KiCad to Ngspice netlist converter</h4> +<a + id="dx1-20001"></a> +<a + id="dx1-20002"></a> +<a + id="dx1-20003"></a> +<!--l. 173--><p class="noindent" >It converts KiCad generated netlists to Ngspice (see Sec. <a +href="#x1-210003.1.8">3.1.8<!--tex4ht:ref: sec:ngspice --></a>) compatible format. It has the +capability to <a + id="x1-20004r1"></a>1. Insert parameters for fictitious components <a + id="x1-20005r2"></a>2. Convert IC into discrete +blocks <a + id="x1-20006r3"></a>3. Insert D-A and A-D converter at appropriate places <a + id="x1-20007r4"></a>4. Insert plotting +and printing statements in netlist and <a + id="x1-20008r5"></a>5. Find current through all components. +<!--l. 184--><p class="indent" > This module is developed by us for eSim and it is indicated by the label 7 in +Fig. <a +href="#x1-220011">3.1<!--tex4ht:ref: blockd --></a>. + +<!--l. 187--><p class="noindent" > + <h4 class="subsectionHead"><span class="titlemark">3.1.8 </span> <a + id="x1-210003.1.8"></a>Ngspice</h4> +<a + id="dx1-21001"></a> +<!--l. 188--><p class="noindent" >Ngspice is a general purpose circuit simulation program for nonlinear dc, nonlinear transient, +and linear ac analyses <span class="cite"> [<span +class="cmbx-10x-x-109">?</span>]</span>. Circuits may contain resistors, capacitors, inductors, mutual +inductors, independent voltage and current sources, four types of dependent sources, lossless +and lossy transmission lines (two separate implementations), switches, uniform +distributed RC lines, and the five most common semiconductor devices: diodes, +<a + id="dx1-21002"></a>BJTs, <a + id="dx1-21003"></a>JFETs, MESFETs, and MOSFET. <a + id="dx1-21004"></a>This module is indicated by the label 9 in +Fig. <a +href="#x1-220011">3.1<!--tex4ht:ref: blockd --></a>. +<!--l. 199--><p class="noindent" > + <h3 class="sectionHead"><span class="titlemark">3.2 </span> <a + id="x1-220003.2"></a>Work flow of eSim</h3> +<!--l. 200--><p class="noindent" >Fig. <a +href="#x1-220011">3.1<!--tex4ht:ref: blockd --></a> shows the work flow in eSim. The block diagram consists of mainly three +parts: + <ul class="itemize1"> + <li class="itemize">Schematic Editor + </li> + <li class="itemize">PCB Layout Editor + </li> + <li class="itemize">Circuit Simulators</li></ul> +<!--l. 208--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-220011"></a> + + +<!--l. 211--><p class="noindent" ><img +src="figures/blockdiagram.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 3.1: </span><span +class="content">Work flow in eSim. Boxes with dotted lines denote the modules developed +in this work.</span></div><!--tex4ht:label?: x1-220011 --> + +<!--l. 216--><p class="indent" > </div><hr class="endfigure"> +<!--l. 218--><p class="indent" > Here we explain the role of each block in designing electronic systems. Circuit design is the +first step in the design of an electronic circuit. Generally a circuit diagram is drawn on a +paper, and then entered into a computer using a schematic editor. EEschema is the schematic +editor for eSim. Thus all the functionalities of EEschema are naturally available in eSim. +<a + id="dx1-22002"></a> +<!--l. 225--><p class="indent" > Libraries for components, explicitly or implicitly supported by Ngspice, have been created +using the features of EEschema. As EEschema is originally intended for PCB design, there are +no fictitious components such as voltage or current sources. Thus, a new library for different +types of voltage and current sources such as sine, pulse and square wave, has been added in +eSim. A library which gives the functionality of printing and plotting has also been +created. +<!--l. 234--><p class="indent" > The schematic editor provides a netlist file, which describes the electrical connections of +the design. In order to create a PCB layout, physical components are required to be mapped +into their footprints. To perform component to footprint mapping, CvPcb is used. Footprints +have been created for the components in the newly created libraries. Pcbnew is used to draw +a PCB layout. +<!--l. 242--><p class="indent" > After designing a circuit, it is essential to check the integrity of the circuit design. In the +case of large electronic circuits, breadboard testing is impractical. In such cases, electronic +system designers rely heavily on simulation. The accuracy of the simulation results can be +increased by accurate modeling of the circuit elements. Model Builder provides the facility to +define a new model for devices and edit existing models. Complex circuit elements can be +created by hierarchical modeling. Subcircuit Builder provides an easy way to create a +subcircuit. +<!--l. 253--><p class="indent" > The netlist generated by Schematic Editor cannot be directly used for simulation +due to compatibility issues. Netlist Converter converts it into Ngspice compatible +format. The type of simulation to be performed and the corresponding options are +provided through a graphical user interface (GUI). This is called Analysis Inserter in +eSim. +<!--l. 260--><p class="indent" > eSim uses Ngspice for analog, digital, mixed-level/mixed-signal circuit simulation. Ngspice +is based on three open source software packages<span class="cite"> [<span +class="cmbx-10x-x-109">?</span>]</span>: + <ul class="itemize1"> + <li class="itemize">Spice3f5 (analog circuit simulator) + </li> + <li class="itemize">Cider1b1 (couples Spice3f5 circuit simulator to DSIM device simulator) + </li> + <li class="itemize">Xspice (code modeling support and simulation of digital components through an + event driven algorithm)</li></ul> +<!--l. 268--><p class="noindent" >It is a part of gEDA <a + id="dx1-22003"></a>project. Ngspice is capable of simulating devices with BSIM, <a + id="dx1-22004"></a>EKV, HICUM, <a + id="dx1-22005"></a><a + id="dx1-22006"></a> + +HiSim, <a + id="dx1-22007"></a>PSP, <a + id="dx1-22008"></a>and PTM <a + id="dx1-22009"></a>models. It is widely used due to its accuracy even for the latest +technology devices. + + <h2 class="chapterHead"><span class="titlemark">Chapter 4</span><br /><a + id="x1-230004"></a>Getting Started</h2> +<!--l. 5--><p class="noindent" >In this chapter we will get started with eSim. We will run through the various options +available with an example circuit. Referring to this chapter will make one familiar with +eSim and will help plan the project before actually designing a circuit. Lets get +started. + <h3 class="sectionHead"><span class="titlemark">4.1 </span> <a + id="x1-240004.1"></a>eSim Main Window</h3> +<!--l. 12--><p class="noindent" > + <h4 class="subsectionHead"><span class="titlemark">4.1.1 </span> <a + id="x1-250004.1.1"></a>Workspace</h4> +<!--l. 13--><p class="noindent" >After installtion is completed, when the eSim is run the first window that appears is +workspace dialog as shown in Fig. <a +href="#x1-250011">4.1<!--tex4ht:ref: workspace --></a>. <hr class="figure"><div class="figure" +> + +<a + id="x1-250011"></a> + + +<!--l. 16--><p class="noindent" ><img +src="figures/workspace.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 4.1: </span><span +class="content">eSim-Workspace</span></div><!--tex4ht:label?: x1-250011 --> + +<!--l. 19--><p class="indent" > </div><hr class="endfigure"> +<!--l. 21--><p class="indent" > The defalut eSim-Workspace can be chosen if the <span +class="cmti-10x-x-109">ok </span>or <span +class="cmti-10x-x-109">cancel </span>button is clicked. Else to +create new workspace <span +class="cmti-10x-x-109">browse </span>button is used. + <h4 class="subsectionHead"><span class="titlemark">4.1.2 </span> <a + id="x1-260004.1.2"></a>Main-GUI</h4> +<!--l. 24--><p class="noindent" >The main GUI window of eSim is as shown in Fig. <a +href="#x1-260012">4.2<!--tex4ht:ref: maingui --></a> <hr class="figure"><div class="figure" +> + +<a + id="x1-260012"></a> + + +<!--l. 27--><p class="noindent" ><img +src="figures/maingui.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 4.2: </span><span +class="content">eSim Main GUI</span></div><!--tex4ht:label?: x1-260012 --> + +<!--l. 30--><p class="indent" > </div><hr class="endfigure"> +<!--l. 31--><p class="indent" > The eSim main GUI window consists the following symbols. + <dl class="enumerate"><dt class="enumerate"> + 1. </dt><dd +class="enumerate">Toolbar + </dd><dt class="enumerate"> + 2. </dt><dd +class="enumerate">Menubar + </dd><dt class="enumerate"> + 3. </dt><dd +class="enumerate">Project explorer + </dd><dt class="enumerate"> + 4. </dt><dd +class="enumerate">Dockarea + </dd><dt class="enumerate"> + 5. </dt><dd +class="enumerate">Console area</dd></dl> + <h5 class="subsubsectionHead"><a + id="x1-270004.1.2"></a>Toolbar</h5> + <ul class="itemize1"> + <li class="itemize">Open Schematic The first tool on the toolbar i.e. <span +class="cmti-10x-x-109">Schematic Editor</span><a + id="dx1-27001"></a>. Doing so + will open EEschema, the schematic editor used in eSim. If a new project is being + created, one will get the schematic editor window with an info dialog box. This is + illustrated in Fig. <a +href="#x1-270023">4.3<!--tex4ht:ref: warning --></a>. This warning can be safely ignored by clicking on <span +class="cmtt-10x-x-109">OK</span>. + <!--l. 50--><p class="noindent" ><hr class="figure"><div class="figure" +><a + id="x1-270023"></a> <img +src="figures/warning.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 4.3: </span><span +class="content">Schematic Editor Window</span></div><!--tex4ht:label?: x1-270023 --> + <!--l. 55--><p class="noindent" ></div><hr class="endfigure"> + <!--l. 57--><p class="noindent" >However, if an already existing project is opened, one would get the schematic + editor window along with a Load error<a + id="dx1-27003"></a>. This is illustrated in Fig. <a +href="#x1-270044">4.4<!--tex4ht:ref: schematic-error --></a>. This + error occurs because the schematic that is opened has not been loaded with + the libraries mentioned in the Load Error message. Close the Load Error + message by clicking on the <span +class="cmtt-10x-x-109">Close </span>button. The RC circuit diagram opens up + as shown in Fig. <a +href="#x1-270055">4.5<!--tex4ht:ref: eeschema --></a>. Now the circuit schematic can be created/edited. To + know how to use the schematic editor to create circuit schematics, refer to + Chapter <a +href="#x1-320005">5<!--tex4ht:ref: chap5 --></a>. + <!--l. 68--><p class="noindent" ><hr class="figure"><div class="figure" +><a + id="x1-270044"></a> <img +src="figures/schematic-error.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 4.4: </span><span +class="content">Schematic Editor Window of an existing Project</span></div><!--tex4ht:label?: x1-270044 --> + <!--l. 73--><p class="noindent" ></div><hr class="endfigure"> + + <!--l. 76--><p class="noindent" ><hr class="figure"><div class="figure" +><a + id="x1-270055"></a> <img +src="figures/eeschema.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 4.5: </span><span +class="content">Schematic Editor Window of an existing Project</span></div><!--tex4ht:label?: x1-270055 --> + <!--l. 81--><p class="noindent" ></div><hr class="endfigure"> + </li> + <li class="itemize">Convert Kicad to Ngspice: The second tool on the toolbar is the <span +class="cmti-10x-x-109">Kicad to Ngspice</span> + <span +class="cmti-10x-x-109">Converter </span>. Before one uses this tool, one should have already created the + spice netlist file (.cir). This file is not compatible with Ngspice. The analysis + window consists of total five tabs as namely <span +class="cmti-10x-x-109">Analysis, Device Model, Source</span> + <span +class="cmti-10x-x-109">Details, Model Library, Subcircuits</span>, out of which only analysis tab is static and + remaining tabs are dynamic. The widgets in the dynamic tab depends on the + components included in the circuit. It consists of the parameters depending + upon the type of sources used. Once the values have been entered, press the + <span +class="cmtt-10x-x-109">Convert </span>key. It will generate <span +class="cmtt-10x-x-109">.cir.out </span>and <span +class="cmtt-10x-x-109">.cir.ckt </span>files in the same project + directory. + </li> + <li class="itemize">Simulation: The suitable netlist generated using <span +class="cmti-10x-x-109">Kicad to Ngspice</span>. This file is + stimulated using Ngspice tool. Clicking on this tool <span +class="cmti-10x-x-109">Simulation</span>, Ngspice and + Pthon plotting window will open, as shown in Fig. <a +href="#x1-270066">4.6<!--tex4ht:ref: simulation-op --></a>. It shows the output + waweform of project. <hr class="figure"><div class="figure" +><a + id="x1-270066"></a> <img +src="figures/simulation-op.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 4.6: </span><span +class="content">Simulation Output in Python Plotting Window</span></div><!--tex4ht:label?: x1-270066 --> + <!--l. 96--><p class="noindent" ></div><hr class="endfigure"> + </li> + <li class="itemize">Foot Print Editor: Clicking on the <span +class="cmti-10x-x-109">Footprint Editor </span>tool will open the <span +class="cmtt-10x-x-109">CvPcb</span> <a + id="dx1-27007"></a>window. + This window will ideally open the .net file for the current project. So, before using this + tool, one should have the netlist for PCB design (a .net file). To know more about how + to generate netlist for PCB, refer to Sec. <a +href="#x1-620007.1.1">7.1.1<!--tex4ht:ref: netc --></a>. + <!--l. 106--><p class="noindent" >Open the project <span +class="cmtt-10x-x-109">RC</span><span +class="cmtt-10x-x-109">_pcb </span>available in the <span +class="cmtt-10x-x-109">Examples </span>folder downloaded from the eSim + website. On clicking the <span +class="cmti-10x-x-109">Footprint Editor </span>tool, we see the corresponding RC_pcb.net file + for RC circuit. This window is shown in Fig. <a +href="#x1-270107">4.7<!--tex4ht:ref: CvPcb-window --></a>. The main purpose of this window is to + let one choose the footprints for the various components in the circuit. Let us view the + footprint <span +class="cmtt-10x-x-109">C1 </span>for capacitor C1. Click on <span +class="cmtt-10x-x-109">C1 </span>from the right hand side of CvPcb + window. Click on <span +class="cmti-10x-x-109">View Selected Footprint </span>tool from the tool bar of CvPcb<a + id="dx1-27008"></a> + window. This will show the footprint corresponding to C1. This is illustrated in + Fig. <a +href="#x1-270118">4.8<!--tex4ht:ref: footprint-c1 --></a>. To know more about how to assign footprints<a + id="dx1-27009"></a> to components, see + Chapter <a +href="#x1-600007">7<!--tex4ht:ref: chap7 --></a>. + <!--l. 119--><p class="noindent" ><hr class="figure"><div class="figure" +><a + id="x1-270107"></a> <img +src="figures/CvPCB-window.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 4.7: </span><span +class="content">CvPCB Window</span></div><!--tex4ht:label?: x1-270107 --> + <!--l. 124--><p class="noindent" ></div><hr class="endfigure"> + + <!--l. 126--><p class="noindent" ><hr class="figure"><div class="figure" +><a + id="x1-270118"></a> <img +src="figures/footprint-c1.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 4.8: </span><span +class="content">Footprint for C1</span></div><!--tex4ht:label?: x1-270118 --> + <!--l. 131--><p class="noindent" ></div><hr class="endfigure"> + </li> + <li class="itemize">PCB Layout: Open the RC_pcb project available in <span +class="cmtt-10x-x-109">Examples</span>. Clicking on the + <span +class="cmti-10x-x-109">Layout Editor </span>tool will open <span +class="cmtt-10x-x-109">Pcbnew</span><a + id="dx1-27012"></a>, the layout editor used in eSim. This + shows the PCB design for RC circuit. In this window, one will create the + PCB. It involves laying tracks and vias, performing optimum routing of tracks, + creating one or more copper layers for PCB, etc. The PCB design for RC + circuit is shown in Fig. <a +href="#x1-270139">4.9<!--tex4ht:ref: pcb-RC --></a>. This is how the PCB will look like when one + actually prints it on a copper-clad board. It will be saved as a <span +class="cmtt-10x-x-109">.brd </span>file in the + same directory. Chapter <a +href="#x1-600007">7<!--tex4ht:ref: chap7 --></a> explains how to use the <span +class="cmti-10x-x-109">Layout Editor </span>to design a + PCB. + <!--l. 145--><p class="noindent" ><hr class="figure"><div class="figure" +><a + id="x1-270139"></a><img +src="figures/pcb-rc.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 4.9: </span><span +class="content">PCB design for RC circuit</span></div><!--tex4ht:label?: x1-270139 --> + <!--l. 150--><p class="noindent" ></div><hr class="endfigure"> + </li> + <li class="itemize">Model Editor: eSim also gives an option to re-configure the model of a component. It + facilitates the user to change models of components such as diode, transistor, MOSFET, + etc. When one clicks on the <span +class="cmti-10x-x-109">Model Builder </span>tool, the window as shown in Fig. <a +href="#x1-2701410">4.10<!--tex4ht:ref: model-builder-blank --></a> will + appear. + <!--l. 160--><p class="noindent" ><hr class="figure"><div class="figure" +><a + id="x1-2701410"></a> <img +src="figures/modeleditor.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 4.10: </span><span +class="content">Footprint for C1</span></div><!--tex4ht:label?: x1-2701410 --> + <!--l. 165--><p class="noindent" ></div><hr class="endfigure"> + <!--l. 166--><p class="noindent" >To create a new model library <span +class="cmtt-10x-x-109">New </span>button is clicked which then opens the template + library folder. We can choose from the template library that can be edited, to create the + new library and the click on <span +class="cmtt-10x-x-109">Save </span>to save the edited model library. Also the existing + library can be edited usind <span +class="cmtt-10x-x-109">Edit </span>option. The user can also use their own library by + uploading it using <span +class="cmtt-10x-x-109">Upload </span>button. + <!--l. 169--><p class="noindent" ><hr class="figure"><div class="figure" +><a + id="x1-2701511"></a> <img +src="figures/model.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 4.11: </span><span +class="content">Model Editor with Diode Model</span></div><!--tex4ht:label?: x1-2701511 --> +<a + id="dx1-27016"></a> + <!--l. 175--><p class="noindent" ></div><hr class="endfigure"> + </li> + <li class="itemize">Subcircuit: eSim has an option to build subcircuits. The subcircuits can again have + components having subcircuits and so on. This enables users to build commonly used + circuits as subcircuits and then use it across circuits. For example, one can build a 12 + + Volt power supply as a subcircuit and then use it as just a single component across + circuits without having the need to recreate it. Clicking on <span +class="cmti-10x-x-109">Subcircuit Builder</span> + tool will allow one to edit or create a subcircuit. To know how to make a + subcircuit, refer to Chapter <a +href="#x1-600007">7<!--tex4ht:ref: chap7 --></a>. Fig. <a +href="#x1-2701812">4.12<!--tex4ht:ref: lm555n-subcircuit --></a> shows the subcircuit of 555 timer IC. + <a + id="dx1-27017"></a> + <!--l. 189--><p class="noindent" ><hr class="figure"><div class="figure" +><a + id="x1-2701812"></a> <img +src="figures/subcircuit.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 4.12: </span><span +class="content">Subcircuit o1f 555 timer IC</span></div><!--tex4ht:label?: x1-2701812 --> +<a + id="dx1-27019"></a> + <!--l. 195--><p class="noindent" ></div><hr class="endfigure"> + </li></ul> +<!--l. 198--><p class="noindent" > + <h5 class="subsubsectionHead"><a + id="x1-280004.1.2"></a>Menubar</h5> + <ul class="itemize1"> + <li class="itemize">New Project: New projects are created in the workspace. When selected this menu, + a new window opens up with <span +class="cmtt-10x-x-109">Enter Project name </span>field. Type the name of the + new project here. Click on OK. A folder will be created in the specified directory. + The name of this folder will be the same as that of the project created. + </li> + <li class="itemize">Open Project: This opens the file dialog of defalut workspace where the projects + are stored. The project can be selected which is then added in the project explorer. + </li> + <li class="itemize">Exit: This button closes the project window and exits. + </li> + <li class="itemize">Help:</li></ul> +<!--l. 213--><p class="noindent" > + <h5 class="subsubsectionHead"><a + id="x1-290004.1.2"></a>Project Explorer</h5> +<!--l. 214--><p class="noindent" >Project explorer has tree of all the project previously added in it. On right clicking +the project we can simply remove or refresh the project in the explorer. Also on +right clicking the project file can be opened in the text editor which can then be +edited. + +<!--l. 217--><p class="noindent" > + <h5 class="subsubsectionHead"><a + id="x1-300004.1.2"></a>Dockarea</h5> +<!--l. 219--><p class="noindent" > + <h5 class="subsubsectionHead"><a + id="x1-310004.1.2"></a>Console Area</h5> +<!--l. 220--><p class="noindent" >Console area provides with the errors and active commands running. + +<!--l. 8--><p class="indent" > + + <h2 class="chapterHead"><span class="titlemark">Chapter 5</span><br /><a + id="x1-320005"></a>Schematic Creation</h2> The first step in the design of an electronic system is the +design of its circuit. This circuit is usually created using a <span +class="cmtt-10x-x-109">Schematic Editor</span><a + id="dx1-32001"></a> and is called a +<span +class="cmtt-10x-x-109">Schematic</span>. <a + id="dx1-32002"></a>Oscad uses <span +class="cmtt-10x-x-109">EEschema</span> <a + id="dx1-32003"></a>as its schematic editor. EEschema is the schematic editor of +KiCad. <a + id="dx1-32004"></a>It is a powerful schematic editor software. It allows the creation and modification of +components and symbol libraries and supports multiple hierarchical layers of printed circuit +design. + <h3 class="sectionHead"><span class="titlemark">5.1 </span> <a + id="x1-330005.1"></a>Familiarising the Schematic Editor interface</h3> +<!--l. 22--><p class="noindent" >Fig. <a +href="#x1-330011">5.1<!--tex4ht:ref: eesch1 --></a> shows the schematic editor and the various menu and toolbars. We will explain them +briefly in this section. <hr class="figure"><div class="figure" +> + +<a + id="x1-330011"></a> + +<div class="center" +> +<!--l. 25--><p class="noindent" > + +<!--l. 26--><p class="noindent" ><img +src="figures/eeschema1_corctd.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 5.1: </span><span +class="content">Schematic editor with the menu bar and toolbars marked</span></div><!--tex4ht:label?: x1-330011 --> +</div> + +<!--l. 30--><p class="indent" > </div><hr class="endfigure"> + <h4 class="subsectionHead"><span class="titlemark">5.1.1 </span> <a + id="x1-340005.1.1"></a>Top menu bar</h4> +<!--l. 35--><p class="noindent" >The top menu bar will be available at the top left corner. Some of the important menu +options in the top menu bar are: + <dl class="compactenum"><dt class="compactenum"> + 1. </dt><dd +class="compactenum">File - The file menu items are given below: + <dl class="compactenum"><dt class="compactenum"> + (a) </dt><dd +class="compactenum">New - Clear current schematic and start a new one + </dd><dt class="compactenum"> + (b) </dt><dd +class="compactenum">Open - Open a schematic + </dd><dt class="compactenum"> + (c) </dt><dd +class="compactenum">Open Recent - A list of recently opened files for loading + </dd><dt class="compactenum"> + (d) </dt><dd +class="compactenum">Save Whole Schematic project - Save current sheet and all its hierarchy. + </dd><dt class="compactenum"> + (e) </dt><dd +class="compactenum">Save Current Sheet Only - Save current sheet, but not others in a hierarchy. + </dd><dt class="compactenum"> + (f) </dt><dd +class="compactenum">Save Current sheet as - Save current sheet with a new name. + </dd><dt class="compactenum"> + (g) </dt><dd +class="compactenum">Print - Access to print menu (See Fig. <a +href="#x1-340112">5.2<!--tex4ht:ref: print --></a>). + </dd><dt class="compactenum"> + (h) </dt><dd +class="compactenum">Plot - Plot the schematic in Postscript, HPGL, SVF or DXF format + </dd><dt class="compactenum"> + (i) </dt><dd +class="compactenum">Quit - Quit the schematic editor.</dd></dl> + <!--l. 53--><p class="noindent" ><hr class="figure"><div class="figure" +><a + id="x1-340112"></a> +<div class="center" +> +<!--l. 54--><p class="noindent" > + +<!--l. 55--><p class="noindent" ><img +src="figures/print.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 5.2: </span><span +class="content">Print options</span></div><!--tex4ht:label?: x1-340112 --> +</div> + <!--l. 59--><p class="noindent" ></div><hr class="endfigure"> + </dd><dt class="compactenum"> + 2. </dt><dd +class="compactenum">Place - The place menu has shortcuts for placing various items like components, wire + and junction, on to the schematic editor window. See Sec. <a +href="#x1-380005.1.5">5.1.5<!--tex4ht:ref: short --></a> to know more about + various shortcut keys (hotkeys). + </dd><dt class="compactenum"> + 3. </dt><dd +class="compactenum">Preferences - The preferences menu has the following options: + <dl class="compactenum"><dt class="compactenum"> + + (a) </dt><dd +class="compactenum">Library - Select libraries and library paths + </dd><dt class="compactenum"> + (b) </dt><dd +class="compactenum">Colors - Select colors for various items. + </dd><dt class="compactenum"> + (c) </dt><dd +class="compactenum">Options - Display schematic editor options (Units, Grid size). + </dd><dt class="compactenum"> + (d) </dt><dd +class="compactenum">Language - Shows the current list of translations. Use default. + </dd><dt class="compactenum"> + (e) </dt><dd +class="compactenum">Hotkeys - Access to the hot keys menu. See Sec. <a +href="#x1-380005.1.5">5.1.5<!--tex4ht:ref: short --></a> about hotkeys. + </dd><dt class="compactenum"> + (f) </dt><dd +class="compactenum">Read preferences - Read configuration file. + </dd><dt class="compactenum"> + (g) </dt><dd +class="compactenum">Save preferences - Save configuration file.</dd></dl> + </dd></dl> +<!--l. 79--><p class="noindent" > + <h4 class="subsectionHead"><span class="titlemark">5.1.2 </span> <a + id="x1-350005.1.2"></a>Top toolbar</h4> +<a + id="dx1-35001"></a> +<a + id="dx1-35002"></a> +<!--l. 80--><p class="noindent" >Some of the important tools in the top toolbar are discussed below. They are marked in +Fig. <a +href="#x1-350033">5.3<!--tex4ht:ref: eeschem2 --></a>. <hr class="figure"><div class="figure" +> + +<a + id="x1-350033"></a> + + +<!--l. 84--><p class="noindent" ><img +src="figures/eeschema2_mod.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 5.3: </span><span +class="content">Toolbar on top with important tools marked</span></div><!--tex4ht:label?: x1-350033 --> + +<!--l. 87--><p class="indent" > </div><hr class="endfigure"> + <dl class="compactenum"><dt class="compactenum"> + 1. </dt><dd +class="compactenum">Save - Save the current schematic + </dd><dt class="compactenum"> + 2. </dt><dd +class="compactenum">Library Editor - Create or edit components. + </dd><dt class="compactenum"> + 3. </dt><dd +class="compactenum">Library Browser - Browse through the various component libraries available + </dd><dt class="compactenum"> + 4. </dt><dd +class="compactenum">Navigate schematic hierarchy - Navigate among the root and sub-sheets in the + hierarchy + </dd><dt class="compactenum"> + 5. </dt><dd +class="compactenum">Print - Print the schematic + </dd><dt class="compactenum"> + 6. </dt><dd +class="compactenum">Generate netlist - Generate a netlist for PCB design or for simulation. + </dd><dt class="compactenum"> + 7. </dt><dd +class="compactenum">Annotate - Annotate the schematic + </dd><dt class="compactenum"> + 8. </dt><dd +class="compactenum">Check ERC - Do Electric Rules Check for the schematic + </dd><dt class="compactenum"> + 9. </dt><dd +class="compactenum">Create BOM - Create a Bill of Materials of the schematic</dd></dl> + <h4 class="subsectionHead"><span class="titlemark">5.1.3 </span> <a + id="x1-360005.1.3"></a>Toolbar on the right</h4> +<a + id="dx1-36001"></a> +<a + id="dx1-36002"></a> +<!--l. 104--><p class="noindent" >The toolbar on the right side of the schematic editor window has many important tools. Some +of them are marked in Fig. <a +href="#x1-360034">5.4<!--tex4ht:ref: eeschem3 --></a>. <hr class="figure"><div class="figure" +> + +<a + id="x1-360034"></a> + + +<!--l. 108--><p class="noindent" ><img +src="figures/eeschema3_mod.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 5.4: </span><span +class="content">Toolbar on right with important tools marked</span></div><!--tex4ht:label?: x1-360034 --> + +<!--l. 111--><p class="indent" > </div><hr class="endfigure"> +<!--l. 112--><p class="indent" > Let us now look at each of these tools and their uses. + <dl class="compactenum"><dt class="compactenum"> + 1. </dt><dd +class="compactenum">Place a component - Load a component to the schematic. See Sec. <a +href="#x1-400005.2.1">5.2.1<!--tex4ht:ref: selplace --></a> for more + details. + </dd><dt class="compactenum"> + 2. </dt><dd +class="compactenum">Place a power port - Load a power port (Vcc, ground) to the schematic + </dd><dt class="compactenum"> + 3. </dt><dd +class="compactenum">Place wire - Draw wires to connect components in schematic + </dd><dt class="compactenum"> + 4. </dt><dd +class="compactenum">Place bus - Place a bus on the schematic + </dd><dt class="compactenum"> + 5. </dt><dd +class="compactenum">Place a no connect - Place a no connect flag, particularly useful in ICs + </dd><dt class="compactenum"> + 6. </dt><dd +class="compactenum">Place a local label - Place a label or node name which is local to the schematic + </dd><dt class="compactenum"> + 7. </dt><dd +class="compactenum">Place a global label - Place a global label (these are connected across all schematic + diagrams in the hierarchy) + </dd><dt class="compactenum"> + 8. </dt><dd +class="compactenum">Create a hierarchical sheet - Create a sub-sheet within the root sheet in the + hierarchy. Hierarchical schematics are a good solution for big projects + </dd><dt class="compactenum"> + 9. </dt><dd +class="compactenum">Place a text or comment - Place a text or comment in the schematic</dd></dl> + <h4 class="subsectionHead"><span class="titlemark">5.1.4 </span> <a + id="x1-370005.1.4"></a>Toolbar on the left</h4> +<a + id="dx1-37001"></a> +<a + id="dx1-37002"></a> +<!--l. 126--><p class="noindent" >Some of the important tools in the toolbar on the left are discussed below. They are marked +in Fig. <a +href="#x1-370035">5.5<!--tex4ht:ref: eeschem4 --></a>. <hr class="figure"><div class="figure" +> + +<a + id="x1-370035"></a> + + +<!--l. 130--><p class="noindent" ><img +src="figures/eeschema4_mod.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 5.5: </span><span +class="content">Toolbar on left with important tools marked</span></div><!--tex4ht:label?: x1-370035 --> + +<!--l. 133--><p class="indent" > </div><hr class="endfigure"> + <dl class="compactenum"><dt class="compactenum"> + 1. </dt><dd +class="compactenum">Show/Hide grid - Show or Hide the grid in the schematic editor. Pressing the tool + again hides (shows) the grid if it was shown (hidden) earlier. + </dd><dt class="compactenum"> + 2. </dt><dd +class="compactenum">Show hidden pins - Show hidden pins of certain components, for example, power + pins of certain ICs.</dd></dl> + <h4 class="subsectionHead"><span class="titlemark">5.1.5 </span> <a + id="x1-380005.1.5"></a>Hotkeys</h4> +<a + id="dx1-38001"></a> +<!--l. 142--><p class="noindent" >A set of keyboard keys are associated with various operations in the schematic editor. These +keys save time and make it easy to switch from one operation to another. The list of hotkeys +can be viewed by going to Preferences in the top menu bar. Choose <span +class="cmti-10x-x-109">Hotkeys </span>and +select <span +class="cmti-10x-x-109">List current keys</span>. The hotkeys can also be edited by selecting the option +<span +class="cmti-10x-x-109">Edit Hotkeys</span>. Some frequently used hotkeys, along with their functions, are given +below: + <ul> + <li class="compactitem">F1 - Zoom in + </li> + <li class="compactitem">F2 - Zoom out + </li> + <li class="compactitem">Ctrl + Z - Undo + </li> + <li class="compactitem">Delete - Delete item + </li> + <li class="compactitem">M - Move item + </li> + <li class="compactitem">C - Copy item + </li> + <li class="compactitem">A - Add/place component + </li> + <li class="compactitem">P - Place power component + </li> + <li class="compactitem">R - Rotate item + </li> + <li class="compactitem">X - Mirror component about X axis + </li> + <li class="compactitem">Y - Mirror component about Y axis + </li> + <li class="compactitem">E - Edit schematic component + + </li> + <li class="compactitem">W - Place wire + </li> + <li class="compactitem">T - Add text + </li> + <li class="compactitem">S - Add sheet</li></ul> +<!--l. 166--><p class="noindent" ><span +class="cmti-10x-x-109">Note: Both lower and upper-case keys will work as hotkeys</span>. +<!--l. 168--><p class="noindent" > + <h3 class="sectionHead"><span class="titlemark">5.2 </span> <a + id="x1-390005.2"></a>Schematic creation for simulation</h3> +<a + id="dx1-39001"></a> +<!--l. 170--><p class="noindent" >There are certain differences between the schematic created for simulation and that created +for PCB design. We need certain components like plots and current sources. for simulation +whereas these are not needed for PCB design. For PCB design, we would require +connectors (e.g. DB15 and 2 pin connector) for taking signals in and out of the +PCB whereas these have no meaning in simulation. This section covers schematic +creation for simulation. Refer to Chapter <a +href="#x1-600007">7<!--tex4ht:ref: chap7 --></a> to know how to create schematic for PCB +design. +<!--l. 177--><p class="indent" > The first step in the creation of circuit schematic is the selection and placement of +required components. Let us see this using an example. Let us create the circuit schematic of +an RC filter given in Fig. <a +href="#x1-390026">5.6<!--tex4ht:ref: schemRC --></a> and do a transient simulation. <hr class="figure"><div class="figure" +> + +<a + id="x1-390026"></a> + + +<!--l. 183--><p class="noindent" ><img +src="figures/componentlibrary.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 5.6: </span><span +class="content">RC circuit</span></div><!--tex4ht:label?: x1-390026 --> + +<!--l. 186--><p class="indent" > </div><hr class="endfigure"> + <h4 class="subsectionHead"><span class="titlemark">5.2.1 </span> <a + id="x1-400005.2.1"></a>Selection and placement of components</h4> +<a + id="dx1-40001"></a> +<!--l. 191--><p class="noindent" >We would need a resistor, a capacitor, a voltage source, ground terminal and some +plot components. To place a resistor on the schematic editor window, select the +<span +class="cmti-10x-x-109">Placea component </span>tool from the toolbar on the right side and click anywhere on +the schematic editor. This opens up the component selection window. (The above +action can also be performed by pressing the key A.) Type <span +class="cmtt-10x-x-109">R </span>in the field <span +class="cmti-10x-x-109">Name </span>of +the <span +class="cmtt-10x-x-109">component selection </span>window as shown in Fig. <a +href="#x1-400027">5.7<!--tex4ht:ref: res --></a>. Click on OK. A resistor +will be tied to the cursor. Place the resistor on the schematic editor by a single +click. +<!--l. 200--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-400027"></a> + + +<!--l. 202--><p class="noindent" ><img +src="figures/sine.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 5.7: </span><span +class="content">Placing a resistor using the Place a Component tool</span></div><!--tex4ht:label?: x1-400027 --> + +<!--l. 205--><p class="indent" > </div><hr class="endfigure"> +<!--l. 206--><p class="indent" > To place the next component, i.e., capacitor, click again on the schematic editor. Type <span +class="cmtt-10x-x-109">C</span> +in the Name field of component selection window. Click on OK. Place the capacitor +on the schematic editor by a single click. Let us now place a sinusoidal voltage +source. This is required for performing transient analysis. To place it, click again +on the schematic editor. On the component selection window, click on <span +class="cmti-10x-x-109">List all</span>. +Choose the library <span +class="cmti-10x-x-109">sourcesSpice </span>by double clicking on it. Select the component +<span +class="cmtt-10x-x-109">SINE </span>and click on OK. Place the sine source on the schematic editor by a single +click. +<!--l. 216--><p class="indent" > Place the component by clicking on the schematic editor. Similarly place a ground +terminal <span +class="cmtt-10x-x-109">gnd </span>from the library <span +class="cmti-10x-x-109">power</span>. It can also be placed using the <span +class="cmti-10x-x-109">Place a power port </span>tool +from the toolbar on the right. Click anywhere on the editor after selecting place a power port +tool. Click <span +class="cmti-10x-x-109">List all </span>and choose <span +class="cmtt-10x-x-109">gnd</span>. Once all the components are placed, the schematic editor +would look like the Fig. <a +href="#x1-400038">5.8<!--tex4ht:ref: afterplace --></a>. <hr class="figure"><div class="figure" +> + +<a + id="x1-400038"></a> + + +<!--l. 225--><p class="noindent" ><img +src="figures/afterplace.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 5.8: </span><span +class="content">All RC circuit components placed</span></div><!--tex4ht:label?: x1-400038 --> + +<!--l. 228--><p class="indent" > </div><hr class="endfigure"> +<!--l. 229--><p class="indent" > Let us rotate the resistor to complete the circuit as shown in Fig. <a +href="#x1-390026">5.6<!--tex4ht:ref: schemRC --></a>. To rotate the +resistor, place the cursor on the resistor and press the key <span +class="cmtt-10x-x-109">R</span>. Note that if the cursor is placed +above the letter <span +class="cmtt-10x-x-109">R </span>(not <span +class="cmtt-10x-x-109">R?</span>) on the resistor, it asks to clarify selection. Choose the option +<span +class="cmti-10x-x-109">Component R</span>. This can be avoided by placing the cursor slightly away from the letter R as +shown in Fig. <a +href="#x1-400059">5.9<!--tex4ht:ref: rotate --></a>. This applies to all components.<a + id="dx1-40004"></a> <hr class="figure"><div class="figure" +> + +<a + id="x1-400059"></a> + + +<!--l. 238--><p class="noindent" ><img +src="figures/rotate.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 5.9: </span><span +class="content">Placing the cursor (cross mark) slightly away from the letter R</span></div><!--tex4ht:label?: x1-400059 --> + +<!--l. 241--><p class="indent" > </div><hr class="endfigure"> +<!--l. 242--><p class="indent" > If one wants to move a component, place the cursor on top of the component and press the +key <span +class="cmtt-10x-x-109">M</span>. The component will be tied to the cursor and can be moved in any direction. +<a + id="dx1-40006"></a> + <h4 class="subsectionHead"><span class="titlemark">5.2.2 </span> <a + id="x1-410005.2.2"></a>Wiring the circuit</h4> +<a + id="dx1-41001"></a> +<!--l. 248--><p class="noindent" >The next step is to wire the connections. Let us connect the resistor to the capacitor. +To do so, point the cursor to the terminal of resistor to be connected and press +the key <span +class="cmtt-10x-x-109">W</span>. It has now changed to the wiring mode. Move the cursor towards the +terminal of the capacitor and click on it. A wire is formed as shown in Fig. <a +href="#x1-41002r1">5.10a<!--tex4ht:ref: wire1 --></a>. +<hr class="figure"><div class="figure" +> + +<a + id="x1-4100510"></a> + +<a + id="x1-41002r1"></a> +<!--l. 258--><p class="noindent" > <img +src="figures/wire1.png" alt="PIC" +> +<span +class="cmr-9">(a)</span> +<span +class="cmr-9">Initial</span> +<span +class="cmr-9">stages</span> <a + id="x1-41003r2"></a> <img +src="figures/wirefin.png" alt="PIC" +> + <span +class="cmr-9">(b)</span> + <span +class="cmr-9">Wiring</span> + <span +class="cmr-9">done</span> <a + id="x1-41004r3"></a> <img +src="figures/schemfin.png" alt="PIC" +> + <span +class="cmr-9">(c)</span> + <span +class="cmr-9">Final</span> + <span +class="cmr-9">schematic</span> + <span +class="cmr-9">with</span> + <span +class="cmr-9">PWR</span><span +class="cmr-9">_FLAG</span> +<br /> <div class="caption" +><span class="id">Figure 5.10: </span><span +class="content">Various stages of wiring</span></div><!--tex4ht:label?: x1-4100510 --> + +<!--l. 266--><p class="indent" > </div><hr class="endfigure"> +<!--l. 267--><p class="indent" > Similarly connect the wires between all terminals and the final schematic would look like +Fig. <a +href="#x1-41003r2">5.10b<!--tex4ht:ref: wirefin --></a>. + <h4 class="subsectionHead"><span class="titlemark">5.2.3 </span> <a + id="x1-420005.2.3"></a>Assigning values to components</h4> +<a + id="dx1-42001"></a> +<!--l. 271--><p class="noindent" >We need to assign values to the components in our circuit i.e., resistor and capacitor. Note +that the sine voltage source has been placed for simulation. The specifications of sine source +will be given during simulation. To assign value to the resistor, place the cursor above the +letter <span +class="cmtt-10x-x-109">R </span>(not <span +class="cmtt-10x-x-109">R?</span>) and press the key <span +class="cmtt-10x-x-109">E</span>. Choose <span +class="cmti-10x-x-109">Field value</span>. Type <span +class="cmtt-10x-x-109">1k </span>in the <span +class="cmti-10x-x-109">Edit value field </span>box +as shown in Fig. <a +href="#x1-4200211">5.11<!--tex4ht:ref: field --></a>. 1k means 1<span +class="cmmi-10x-x-109">k</span>Ω. Similarly give the value <span +class="cmtt-10x-x-109">1u </span>for the capacitor. 1u means +1<span +class="cmmi-10x-x-109">μF</span>. +<!--l. 281--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-4200211"></a> + + +<!--l. 283--><p class="noindent" ><img +src="figures/field.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 5.11: </span><span +class="content">Editing value of resistor</span></div><!--tex4ht:label?: x1-4200211 --> + +<!--l. 286--><p class="indent" > </div><hr class="endfigure"> + <h4 class="subsectionHead"><span class="titlemark">5.2.4 </span> <a + id="x1-430005.2.4"></a>Annotation and ERC</h4> +<a + id="dx1-43001"></a> +<a + id="dx1-43002"></a> +<a + id="dx1-43003"></a> +<a + id="dx1-43004"></a> +<!--l. 290--><p class="noindent" >The next step is to annotate the schematic. Annotation gives unique references to the +components. To annotate the schematic, click on <span +class="cmti-10x-x-109">Annotate schematic </span>tool from the +top toolbar. Click on annotation, then click on OK and finally click on close as +shown in Fig. <a +href="#x1-4300813">5.13<!--tex4ht:ref: anno --></a>. The schematic is now annotated. The question marks next to +component references have been replaced by unique numbers. If there are more than +one instance of a component (say resistor), the annotation will be done as R1, R2, +etc. +<!--l. 299--><p class="indent" > Let us now do <span +class="cmtt-10x-x-109">ERC </span>or <span +class="cmtt-10x-x-109">Electric Rules Check</span>. To do so, click on <span +class="cmti-10x-x-109">Perform electric rules</span> +<span +class="cmti-10x-x-109">check </span>tool from the top toolbar. Click on <span +class="cmti-10x-x-109">Test Erc </span>button. The error as shown in Fig. <a +href="#x1-4300712">5.12<!--tex4ht:ref: erc --></a> +may be displayed. Click on close in the test erc<a + id="dx1-43005"></a> window. <a + id="dx1-43006"></a><hr class="figure"><div class="figure" +> + +<a + id="x1-4300712"></a> + + +<!--l. 306--><p class="noindent" ><img +src="figures/erc1.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 5.12: </span><span +class="content">ERC error</span></div><!--tex4ht:label?: x1-4300712 --> + +<!--l. 309--><p class="indent" > </div><hr class="endfigure"> +<!--l. 310--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-4300813"></a> + + +<!--l. 312--><p class="noindent" ><img +src="figures/anno.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 5.13: </span><span +class="content">Steps in annotating a schematic: 1. First click on Annotation then 2. Click +on Ok then 3. Click on close</span></div><!--tex4ht:label?: x1-4300813 --> + +<!--l. 315--><p class="indent" > </div><hr class="endfigure"> +<!--l. 316--><p class="indent" > There will be a green arrow pointing to the source of error in the schematic. Here it points +to the ground terminal. This is shown in Fig. <a +href="#x1-4300914">5.14<!--tex4ht:ref: ercgnd --></a>. <hr class="figure"><div class="figure" +> + +<a + id="x1-4300914"></a> + + +<!--l. 321--><p class="noindent" ><img +src="figures/ercgnd.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 5.14: </span><span +class="content">Green arrow pointing to Ground terminal indicating an ERC error</span></div><!--tex4ht:label?: x1-4300914 --> + +<!--l. 324--><p class="indent" > </div><hr class="endfigure"> +<!--l. 325--><p class="indent" > To correct this error, place a <span +class="cmtt-10x-x-109">PWR</span><span +class="cmtt-10x-x-109">_FLAG </span>from the EEschema library <span +class="cmti-10x-x-109">power</span>. <a + id="dx1-43010"></a>Connect the +power flag to the ground terminal as shown in Fig. <a +href="#x1-41004r3">5.10c<!--tex4ht:ref: schemfin --></a>. More information about +PWR_FLAG is given in Sec. <span +class="cmbx-10x-x-109">??</span>. One needs to place <span +class="cmtt-10x-x-109">PWR</span><span +class="cmtt-10x-x-109">_FLAG </span>wherever the error shown in +Fig. <a +href="#x1-4300712">5.12<!--tex4ht:ref: erc --></a> is obtained. Repeat the ERC. Now there are no errors. With this we have created +the schematic for simulation. + <h4 class="subsectionHead"><span class="titlemark">5.2.5 </span> <a + id="x1-440005.2.5"></a>Netlist generation</h4> +<a + id="dx1-44001"></a> +<!--l. 335--><p class="noindent" >To simulate the circuit that has been created in the previous section, we need to generate its +netlist. <span +class="cmtt-10x-x-109">Netlist </span>is a list of components in the schematic along with their connection +information. <a + id="dx1-44002"></a>To do so, click on the <span +class="cmti-10x-x-109">Generate netlist </span>tool from the top toolbar. Click on spice +from the window that opens up. Uncheck the option <span +class="cmtt-10x-x-109">Default Format</span>. Then click on <span +class="cmti-10x-x-109">Netlist</span>. +This is shown in Fig. <a +href="#x1-4400315">5.15<!--tex4ht:ref: chap5net --></a>. Save the netlist. This will be a <span +class="cmtt-10x-x-109">.cir </span>file. Do not change the +directory while saving. <hr class="figure"><div class="figure" +> + +<a + id="x1-4400315"></a> + + +<!--l. 346--><p class="noindent" ><img +src="figures/netlist.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 5.15: </span><span +class="content">Steps in generating a Netlist for simulation: 1. Click on Spice then 2. +Check the option <span +class="cmtt-10x-x-109">Defalut Format </span>then 3. Click on Netlist </span></div><!--tex4ht:label?: x1-4400315 --> + +<!--l. 349--><p class="indent" > </div><hr class="endfigure"> +<!--l. 350--><p class="indent" > Now the netlist is ready to be simulated. Chapter <a +href="#x1-450006">6<!--tex4ht:ref: chap6 --></a> explains how to perform simulations. +Refer to <span class="cite"> [<span +class="cmbx-10x-x-109">?</span>]</span> or <span class="cite"> [<span +class="cmbx-10x-x-109">?</span>]</span> to know more about EEschema. + + + <h2 class="chapterHead"><span class="titlemark">Chapter 6</span><br /><a + id="x1-450006"></a>Simulation</h2> Circuit simulation <a + id="dx1-45001"></a>uses mathematical models to replicate the +behaviour of an actual device or circuit. Simulation software allows to model circuit +operations. Simulating a circuit’s behaviour before actually building it can greatly improve +design efficiency. eSim uses <span +class="cmtt-10x-x-109">Ngspice</span><a + id="dx1-45002"></a> for analog, digital and mixed-level/mixed-signal circuit +simulation. The various steps involved in simulating a circuit schematic in eSim are given +below: + <ul class="itemize1"> + <li class="itemize">Kicad to Ngspice Conversion: The schematic file generated in Kicad i.e. <span +class="cmtt-10x-x-109">.cir </span>file is to + be converted into a ngspice compatible file before simulation. The process of conversion + involves following steps- + <dl class="enumerate"><dt class="enumerate"> + 1. </dt><dd +class="enumerate">Analysis insertion - This tool is used to insert the type of analysis to the + netlist. It is done by the <span +class="cmti-10x-x-109">Analysis Inserter </span>tool in the eSim toolbar. <a + id="dx1-45004"></a> + </dd><dt class="enumerate"> + 2. </dt><dd +class="enumerate">Source Details <a + id="dx1-45006"></a>- The netlist created in the <span +class="cmti-10x-x-109">Schematic Editor </span>is converted to + Ngspice format and analysis commands is appended to it. It is done by the + <span +class="cmti-10x-x-109">Netlist Converter </span>tool in the eSim toolbar. <a + id="dx1-45007"></a> + </dd><dt class="enumerate"> + 3. </dt><dd +class="enumerate">Ngspice Modelling <a + id="dx1-45009"></a>- Ngspice simulation of the netlist is performed. It is done + by clicking on the <span +class="cmti-10x-x-109">Ngspice </span>tool in the eSim toolbar. + </dd><dt class="enumerate"> + 4. </dt><dd +class="enumerate">Model Library - Model library adds the component library of the components + like Diode, JFET, MOS, IGBT. These library file contains the parameters + and the values of the components. + </dd><dt class="enumerate"> + 5. </dt><dd +class="enumerate">Sub-Circuit - A sub circuiting can be done using this tool. This involves + adding the sub circuit used in the main circuit. This adds all the project files + of the sub circuit.</dd></dl> + </li> + <li class="itemize">Simulation: The output file produced is used for simulation to plot the output in the + Ngspice.</li></ul> +<!--l. 34--><p class="noindent" >In the following sections, we shall describe each of the above steps. + <h3 class="sectionHead"><span class="titlemark">6.1 </span> <a + id="x1-460006.1"></a>Analysis Inserter</h3> +<a + id="dx1-46001"></a> +<!--l. 38--><p class="noindent" >In order to simulate a circuit, the user must define the type of analysis to be done on the +circuit. The types of analysis <a + id="dx1-46002"></a>include <span +class="cmtt-10x-x-109">Operating point analysis</span>, <span +class="cmtt-10x-x-109">DC analysis</span>, +<span +class="cmtt-10x-x-109">AC analysis</span>, <span +class="cmtt-10x-x-109">transient analysis</span>, etc. The user should also specify the options + +corresponding to each analysis. This is facilitated by the <span +class="cmti-10x-x-109">Analysis Inserter </span>tool in +eSim. +<!--l. 46--><p class="indent" > Analysis Inserter generates the commands for Ngspice. When one clicks on <span +class="cmti-10x-x-109">Kicad to</span> +<span +class="cmti-10x-x-109">Ngspice </span>from the eSim toolbar, one gets the Analysis Inserter GUI as shown in Fig. <a +href="#x1-460031">6.1<!--tex4ht:ref: 1 --></a>. The +various tabs in this GUI correspond to the various types of analysis. The user can enter +the details, needed to perform simulation, in the corresponding fields under these +tabs. +<!--l. 53--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-460031"></a> + + +<!--l. 55--><p class="noindent" ><img +src="figures/analysis.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 6.1: </span><span +class="content">Analysis Insertor GUI</span></div><!--tex4ht:label?: x1-460031 --> + +<!--l. 58--><p class="indent" > </div><hr class="endfigure"> + <h4 class="subsectionHead"><span class="titlemark">6.1.1 </span> <a + id="x1-470006.1.1"></a>Types of analysis</h4> +<a + id="dx1-47001"></a> +<!--l. 64--><p class="noindent" >eSim supports three types of analyses: <a + id="x1-47002r1"></a>1. DC Analysis (Operating Point and DC Sweep) +<a + id="dx1-47003"></a><a + id="x1-47004r2"></a>2. AC Small-signal Analysis <a + id="dx1-47005"></a><a + id="x1-47006r3"></a>3. Transient Analysis. <a + id="dx1-47007"></a> +Other analysis in the <span +class="cmti-10x-x-109">Analysis Inserter </span>are currently under progress. The different types of +analyses supported in eSim are explained below <span class="cite"> [<span +class="cmbx-10x-x-109">?</span>]</span>. +<!--l. 74--><p class="noindent" > + <h5 class="subsubsectionHead"><a + id="x1-480006.1.1"></a>DC analysis</h5> +<a + id="dx1-48001"></a> +<!--l. 74--><p class="noindent" >The <span +class="cmtt-10x-x-109">DC analysis </span>determines the dc operating point of the circuit with inductors shorted and +capacitors opened. The DC analysis options are specified on the <span +class="cmti-10x-x-109">.dc</span> <a + id="dx1-48002"></a>and <span +class="cmti-10x-x-109">.op</span><a + id="dx1-48003"></a> control +lines. +<!--l. 79--><p class="indent" > There is assumed to be no time dependence on any of the sources within the system +description. The simulator algorithm subdivides the circuit into those portions which require +the <span +class="cmtt-10x-x-109">analog simulator algorithm </span>and those which require the <span +class="cmtt-10x-x-109">event-driven algorithm</span>. +Each subsystem block is then iterated to solution, with the interfaces between analog nodes +and event-driven nodes iterated for consistency across the entire system. Once stable values +are obtained for all nodes in the system, the analysis halts and the results could be displayed +or printed out. +<!--l. 89--><p class="indent" > A <span +class="cmtt-10x-x-109">DC analysis </span>is automatically performed prior to a <span +class="cmtt-10x-x-109">transient analysis </span>to determine +the transient initial conditions, and prior to an <span +class="cmtt-10x-x-109">ac small-signal analysis </span>to determine the +linearised, small-signal models for nonlinear devices. The <span +class="cmtt-10x-x-109">DC analysis </span>can also be used to +generate dc transfer curves: a specified independent voltage or current source is stepped over a +user-specified range and the dc output variables are stored for each sequential source +value. +<!--l. 97--><p class="noindent" > + <h5 class="subsubsectionHead"><a + id="x1-490006.1.1"></a>AC small-signal analysis</h5> +<a + id="dx1-49001"></a> +<!--l. 98--><p class="noindent" ><span +class="cmtt-10x-x-109">AC analysis </span>is limited to analog nodes. It represents the small signal, sinusoidal +solution of the analog system described at a particular frequency or set of frequencies. +This analysis is similar to the <span +class="cmtt-10x-x-109">DC analysis </span>in that it represents the steady-state +behaviour of the described system with a single input node at a given set of stimulus +frequencies. + +<!--l. 105--><p class="indent" > The program first computes the dc operating point of the circuit and determines +linearised, small-signal models for all of the nonlinear devices in the circuit. The resultant +linear circuit is then analyzed over a user-specified range of frequencies. The desired output +of an ac small-signal analysis is usually a transfer function (voltage gain, trans +impedance, etc.). If the circuit has only one ac input, it is convenient to set that input to +unity and zero phase, so that output variables have the same value as the transfer +function. +<!--l. 114--><p class="noindent" > + <h5 class="subsubsectionHead"><a + id="x1-500006.1.1"></a>Transient analysis</h5> +<a + id="dx1-50001"></a> +<!--l. 115--><p class="noindent" ><span +class="cmtt-10x-x-109">Transient analysis </span>is an extension of <span +class="cmtt-10x-x-109">DC analysis </span>to the time domain. A <span +class="cmtt-10x-x-109">transient</span> +<span +class="cmtt-10x-x-109">analysis </span>begins by obtaining a DC solution to provide a point of departure for simulating +time-varying behaviour. Once the DC solution is obtained, the time-dependent aspects of the +system are reintroduced and the simulator algorithms incrementally solve for the time varying +behaviour of the entire system. Inconsistencies in node values are resolved by the simulation +algorithms such that the time-dependent waveforms created by the analysis are consistent +across the entire simulated time interval. +<!--l. 125--><p class="indent" > Resulting time-varying descriptions of node behaviour for the specified time interval are +accessible. All sources which are not time dependent (for example, power supplies) are +set to their dc value. The transient time interval is specified on a <span +class="cmti-10x-x-109">.tran </span>control +line. +<!--l. 131--><p class="noindent" > + <h4 class="subsectionHead"><span class="titlemark">6.1.2 </span> <a + id="x1-510006.1.2"></a>DC analysis inserter</h4> +<!--l. 132--><p class="noindent" >By default <span +class="cmtt-10x-x-109">DC analysis </span>option appears when one clicks on <span +class="cmti-10x-x-109">Analysis Inserter</span>. Here we need +to give the details of input <span +class="cmti-10x-x-109">source name</span>, <span +class="cmti-10x-x-109">start value </span>of input, <span +class="cmti-10x-x-109">increment </span>and <span +class="cmti-10x-x-109">stop </span>value. Once +this is done, click on <span +class="cmti-10x-x-109">Add Simulation Data</span>. +<!--l. 137--><p class="indent" > Fig. <a +href="#x1-510032">6.2<!--tex4ht:ref: 2 --></a> gives an example of <span +class="cmtt-10x-x-109">DC analysis </span>inserter. In this example, <span +class="cmtt-10x-x-109">v1 </span>is the input +voltage source which <span +class="cmti-10x-x-109">starts </span>at <span +class="cmtt-10x-x-109">0 Volt</span>, <span +class="cmti-10x-x-109">increments </span>by <span +class="cmtt-10x-x-109">1 Volt </span>and <span +class="cmti-10x-x-109">stops </span>at <span +class="cmtt-10x-x-109">10 Volt</span>. On +clicking <span +class="cmti-10x-x-109">Add Simulation Data</span>, the analysis command is generated and is of the form: +<br +class="newline" /><span +class="cmtt-10x-x-109">.dc</span><a + id="dx1-51001"></a> <span +class="cmtt-10x-x-109">sourcename vstart vstop vincr </span><br +class="newline" />The <span +class="cmtt-10x-x-109">.dc </span>line defines the dc transfer curve source and sweep limits (with capacitors open and +inductors shorted). <span +class="cmtt-10x-x-109">srcnam </span>is the name of an independent voltage or current source. <span +class="cmtt-10x-x-109">vstart</span>, +<span +class="cmtt-10x-x-109">vstop</span>, and <span +class="cmtt-10x-x-109">vincr </span>are the starting, final, and incrementing values respectively, of the +source. +<!--l. 151--><p class="indent" > When we check the option <span +class="cmti-10x-x-109">Operating Point analysis</span><a + id="dx1-51002"></a> on the DC analysis window, <span +class="cmtt-10x-x-109">.op </span>gets +appended to the analysis statement. <hr class="figure"><div class="figure" +> + +<a + id="x1-510032"></a> + + +<!--l. 156--><p class="noindent" ><img +src="figures/dc1.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 6.2: </span><span +class="content">DC Analysis GUI</span></div><!--tex4ht:label?: x1-510032 --> + +<!--l. 159--><p class="indent" > </div><hr class="endfigure"> +<!--l. 160--><p class="indent" > The inclusion of the line <span +class="cmtt-10x-x-109">.op </span>in the analysis file directs Ngspice to determine the dc +operating point of the circuit with inductors shorted and capacitors opened. + <h4 class="subsectionHead"><span class="titlemark">6.1.3 </span> <a + id="x1-520006.1.3"></a>AC analysis inserter</h4> +<a + id="dx1-52001"></a> +<!--l. 165--><p class="noindent" >When one clicks on the option <span +class="cmti-10x-x-109">AC </span>in the <span +class="cmti-10x-x-109">Analysis Inserter </span>GUI, the window given in +Fig. <a +href="#x1-520023">6.3<!--tex4ht:ref: 4 --></a> appears. <hr class="figure"><div class="figure" +> + +<a + id="x1-520023"></a> + + +<!--l. 169--><p class="noindent" ><img +src="figures/ac1.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 6.3: </span><span +class="content">AC Analysi GUI</span></div><!--tex4ht:label?: x1-520023 --> + +<!--l. 172--><p class="indent" > </div><hr class="endfigure"> +<!--l. 173--><p class="indent" > Here one needs to enter the details of <span +class="cmti-10x-x-109">scale</span>, <span +class="cmti-10x-x-109">start frequency</span>, <span +class="cmti-10x-x-109">stop frequency </span>and <span +class="cmti-10x-x-109">Number of</span> +<span +class="cmti-10x-x-109">points</span>. +<!--l. 176--><p class="indent" > After entering these values, click on <span +class="cmti-10x-x-109">Add Simulation Data</span>. The analysis statement is +generated. This is in one of the three forms listed below, depending on the type of <span +class="cmti-10x-x-109">scale </span>that +one chooses. The types of <span +class="cmti-10x-x-109">scale </span>available are <span +class="cmti-10x-x-109">dec</span>, <span +class="cmti-10x-x-109">oct</span>, and <span +class="cmti-10x-x-109">lin</span>, the usage of which is explained +below: <br +class="newline" /><span +class="cmtt-10x-x-109">.ac dec nd fstart fstop </span><br +class="newline" /><span +class="cmtt-10x-x-109">.ac oct no fstart fstop </span><br +class="newline" /><span +class="cmtt-10x-x-109">.ac lin np fstart fstop</span> <a + id="dx1-52003"></a><br +class="newline" />Here, <span +class="cmtt-10x-x-109">dec </span>stands for decade variation and <span +class="cmtt-10x-x-109">nd </span>is the number of points per decade. <span +class="cmtt-10x-x-109">oct </span>stands +for octave variation and <span +class="cmtt-10x-x-109">no </span>is the number of points per octave. <span +class="cmtt-10x-x-109">lin </span>stands for linear variation +and <span +class="cmtt-10x-x-109">np </span>is the number of points. <span +class="cmtt-10x-x-109">fstart </span>is the starting frequency and <span +class="cmtt-10x-x-109">fstop </span>is the final +frequency. +<!--l. 192--><p class="indent" > If the <span +class="cmtt-10x-x-109">.ac </span>analysis is included in the analysis file, Ngspice performs an AC analysis of the +circuit over the specified frequency range. Note that in order for this analysis to be +meaningful, at least one independent source must have been specified with an ac value. While +creating the schematic for performing ac analysis, add the component <span +class="cmtt-10x-x-109">AC </span>from the +<span +class="cmti-10x-x-109">sourcesSpice </span>library. + <h4 class="subsectionHead"><span class="titlemark">6.1.4 </span> <a + id="x1-530006.1.4"></a>Transient analysis inserter</h4> +<a + id="dx1-53001"></a> +<!--l. 199--><p class="noindent" >When one clicks on the option <span +class="cmti-10x-x-109">Transient </span>in the <span +class="cmti-10x-x-109">Analysis Inserter </span>GUI, the window given in +Fig. <a +href="#x1-530034">6.4<!--tex4ht:ref: 6 --></a> appears. Here one needs to enter the details of <span +class="cmti-10x-x-109">start time</span>, <span +class="cmti-10x-x-109">step time</span>, and <span +class="cmti-10x-x-109">stop time</span>. +After entering these values, click on <span +class="cmti-10x-x-109">Add Simulation Data</span>. The analysis statement is +generated. It is of the form: +<!--l. 206--><p class="indent" > <span +class="cmtt-10x-x-109">.tran tstep tstop tstart</span><a + id="dx1-53002"></a> +<!--l. 208--><p class="indent" > Here, <span +class="cmtt-10x-x-109">tstep </span>is the printing or plotting increment for line-printer output. For use +with the post-processor, <span +class="cmtt-10x-x-109">tstep </span>is the suggested computing increment. <span +class="cmtt-10x-x-109">tstop </span>is the +final time, and <span +class="cmtt-10x-x-109">tstart </span>is the initial time. If tstart is omitted, it is assumed to be +zero. +<!--l. 214--><p class="indent" > The transient analysis always begins at time zero. In the interval <span +class="cmmi-10x-x-109"><</span><span +class="cmtt-10x-x-109">zero, tstart</span><span +class="cmmi-10x-x-109">></span>, the +circuit is analyzed (to reach a steady state), but no outputs are stored. In the interval +<span +class="cmmi-10x-x-109"><</span><span +class="cmtt-10x-x-109">tstart, tstop</span><span +class="cmmi-10x-x-109">></span>, the circuit is analyzed and outputs are stored. <hr class="figure"><div class="figure" +> + +<a + id="x1-530034"></a> + + +<!--l. 221--><p class="noindent" ><img +src="figures/trans1.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 6.4: </span><span +class="content">Transient Analysis GUI</span></div><!--tex4ht:label?: x1-530034 --> + +<!--l. 224--><p class="indent" > </div><hr class="endfigure"> + <h3 class="sectionHead"><span class="titlemark">6.2 </span> <a + id="x1-540006.2"></a>Adding Source Details</h3> +<!--l. 227--><p class="noindent" >Source details is basically a dynamic tab, i.e. the feilds are added as per the circuit. The +number of sources schematic has like AC,DC is the number of fields that get added in the +GUI. Consider a Half-Adder circuit as shown in Fig. <a +href="#x1-540015">6.5<!--tex4ht:ref: halfschematic --></a> <hr class="figure"><div class="figure" +> + +<a + id="x1-540015"></a> + + +<!--l. 231--><p class="noindent" ><img +src="figures/halfschematic.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 6.5: </span><span +class="content">Half Adder Schematic</span></div><!--tex4ht:label?: x1-540015 --> + +<!--l. 234--><p class="indent" > </div><hr class="endfigure"> +<!--l. 235--><p class="indent" > Here, total three DC input source are used and hence the source detail GUI wuould be +having three input fields as shown is Fig. <a +href="#x1-540026">6.6<!--tex4ht:ref: sourcedetails --></a> <hr class="figure"><div class="figure" +> + +<a + id="x1-540026"></a> + + +<!--l. 238--><p class="noindent" ><img +src="figures/sourcedetails.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 6.6: </span><span +class="content">Source Details of Half-Adder</span></div><!--tex4ht:label?: x1-540026 --> + +<!--l. 241--><p class="indent" > </div><hr class="endfigure"> + <h3 class="sectionHead"><span class="titlemark">6.3 </span> <a + id="x1-550006.3"></a>Adding Ngspice Model</h3> +<!--l. 247--><p class="noindent" > + <h3 class="sectionHead"><span class="titlemark">6.4 </span> <a + id="x1-560006.4"></a>Adding Device Model Library</h3> +<!--l. 248--><p class="noindent" >Spice based simulators include a feature which allows accurate modeling of semiconductor +devices such as diodes, transistors etc. Model libraries holds these features to define +models for devices such as diodes, MOSFET, BJT, JFET, IGBT, Magnetic core +etc. +<!--l. 251--><p class="indent" > The fields in this tab are added for each such device in the circuit and the corresponding +model library is added. In the example of bridgerectifier as shown in Fig. <a +href="#x1-560017">6.7<!--tex4ht:ref: bridgerectifier --></a> for four diodes +library files are added as in Fig. <span +class="cmbx-10x-x-109">??</span> <hr class="figure"><div class="figure" +> + +<a + id="x1-560017"></a> + + +<!--l. 254--><p class="noindent" ><img +src="figures/bridgerectifier.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 6.7: </span><span +class="content">Schematic of Bridge Rectifier</span></div><!--tex4ht:label?: x1-560017 --> + +<!--l. 257--><p class="indent" > </div><hr class="endfigure"> +<!--l. 259--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-560028"></a> + + +<!--l. 261--><p class="noindent" ><img +src="figures/devicemodel.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 6.8: </span><span +class="content">Device Model GUI Window</span></div><!--tex4ht:label?: x1-560028 --> + +<!--l. 264--><p class="indent" > </div><hr class="endfigure"> + <h3 class="sectionHead"><span class="titlemark">6.5 </span> <a + id="x1-570006.5"></a>Adding Sub Circuit</h3> +<!--l. 267--><p class="noindent" >Sub-circuiting is the way of hierarchical modeling. The sub circuit file in the main circuits +needs to be added before converting it. Let us consider the simple example of Full-Adder +circuit containing two half adder sub circuits. +<!--l. 270--><p class="noindent" > + <h3 class="sectionHead"><span class="titlemark">6.6 </span> <a + id="x1-580006.6"></a>Kicad to Ngspice Conversion</h3> +<!--l. 271--><p class="noindent" >After Filling up the values in all the above mentioned fields the convert button is pressed for +the conversion process to finish. If all the files are added the <span +class="cmtt-10x-x-109">successful </span>messege box is +popped on the screen as shown in Fig. <a +href="#x1-580019">6.9<!--tex4ht:ref: success --></a>. Then click <span +class="cmtt-10x-x-109">ok</span>, this will create the <span +class="cmtt-10x-x-109">.cir.out,</span> +<span +class="cmtt-10x-x-109">analysis </span>and other files in the project folders. +<!--l. 274--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-580019"></a> + + +<!--l. 276--><p class="noindent" ><img +src="figures/convert.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 6.9: </span><span +class="content">Successful Conversion Pop-Up Window</span></div><!--tex4ht:label?: x1-580019 --> + +<!--l. 279--><p class="indent" > </div><hr class="endfigure"> + <h3 class="sectionHead"><span class="titlemark">6.7 </span> <a + id="x1-590006.7"></a>Simulation</h3> +<!--l. 282--><p class="noindent" >After the Kicad to Ngspice conversion is successfully completed simulation tab on the toolbar +is clicked to check the output waveform of the project. The windows shown if Fig. <a +href="#x1-5900110">6.10<!--tex4ht:ref: pythonplot --></a> and +Fig. <a +href="#x1-5900211">6.11<!--tex4ht:ref: ngspicewindow --></a> are opned in dockarea. +<!--l. 284--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-5900110"></a> + + +<!--l. 286--><p class="noindent" ><img +src="figures/pythonplot.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 6.10: </span><span +class="content">Pythonplot Window in a Dockarea</span></div><!--tex4ht:label?: x1-5900110 --> + +<!--l. 289--><p class="indent" > </div><hr class="endfigure"> +<!--l. 291--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-5900211"></a> + + +<!--l. 293--><p class="noindent" ><img +src="figures/ngspicewindow.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 6.11: </span><span +class="content">Ngspice Terminal in a Dockarea</span></div><!--tex4ht:label?: x1-5900211 --> + +<!--l. 296--><p class="indent" > </div><hr class="endfigure"> +<!--l. 298--><p class="indent" > Following are the commands to be given in Ngspice window. + <ul class="itemize1"> + <li class="itemize"><span +class="cmtt-10x-x-109">plot allv </span>- Plots all the voltage waveforms. + </li> + <li class="itemize"><span +class="cmtt-10x-x-109">plot v(node-name) </span>- Plot a waveform of the node-name voltage source.</li></ul> +<!--l. 304--><p class="indent" > The output in the ngspice window is shown in Fig. <a +href="#x1-5900312">6.12<!--tex4ht:ref: ngspiceoutput --></a> <hr class="figure"><div class="figure" +> + +<a + id="x1-5900312"></a> + + +<!--l. 307--><p class="noindent" ><img +src="figures/ngspiceoutput.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 6.12: </span><span +class="content">Output in a Ngspice Window</span></div><!--tex4ht:label?: x1-5900312 --> + +<!--l. 310--><p class="indent" > </div><hr class="endfigure"> +<!--l. 313--><p class="indent" > Likewise, in the pythonplot window the checkbox of a perticular source can be chosen +and then <span +class="cmtt-10x-x-109">PLOT </span>button is clicked. Ths output in pythonplot window is shown in +Fig. <a +href="#x1-5900413">6.13<!--tex4ht:ref: pythonplot1 --></a> +<!--l. 315--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-5900413"></a> + + +<!--l. 317--><p class="noindent" ><img +src="figures/pythonplot1.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 6.13: </span><span +class="content">output in a Pythonplot Window</span></div><!--tex4ht:label?: x1-5900413 --> + +<!--l. 320--><p class="indent" > </div><hr class="endfigure"> + + <h2 class="chapterHead"><span class="titlemark">Chapter 7</span><br /><a + id="x1-600007"></a>PCB Design</h2> Printed Circuit Board (PCB) <a + id="dx1-60001"></a>design is an important step in +electronic system design. Every component of the circuit needs to be placed and connections +routed to minimise delay and area. Each component has an associated footprint. Footprint +refers to the physical layout of a component that is required to mount it on the PCB.<a + id="dx1-60002"></a> <a + id="dx1-60003"></a>PCB +design involves associating footprints to all components, placing them appropriately to +minimise wire length and area, connecting the footprints using tracks/vias and finally +extracting the required files needed for printing the PCB. Let us see the steps to design PCB +using eSim. + <h3 class="sectionHead"><span class="titlemark">7.1 </span> <a + id="x1-610007.1"></a>Schematic creation for PCB design</h3> +<!--l. 16--><p class="noindent" >In Chapter <a +href="#x1-320005">5<!--tex4ht:ref: chap5 --></a>, we have seen the differences between schematic for simulation and schematic +for PCB design. Let us design the PCB for an RC circuit. A resistor, capacitor, ground, power +flag and a connector are required. Connectors are used to take signals in and out of the +PCB. +<!--l. 22--><p class="indent" > Create the circuit schematic as shown in Fig. <a +href="#x1-610011">7.1<!--tex4ht:ref: pcbschfin --></a>. The two pin connector (<span +class="cmti-10x-x-109">CONN</span><span +class="cmti-10x-x-109">_2</span>) can +be placed from the EEschema library <span +class="cmti-10x-x-109">conn</span>. See Sec. <span +class="cmbx-10x-x-109">??</span> to know more about EEschema +library <span +class="cmti-10x-x-109">conn</span>. Do the annotation and test for ERC. Refer to Chapter <a +href="#x1-320005">5<!--tex4ht:ref: chap5 --></a> to know more about +basic steps in schematic creation. +<!--l. 29--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-610011"></a> + + +<!--l. 31--><p class="noindent" ><img +src="figures/pcbschfin.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.1: </span><span +class="content">Final circuit schematic for RC low pass circuit</span></div><!--tex4ht:label?: x1-610011 --> + +<!--l. 34--><p class="indent" > </div><hr class="endfigure"> + <h4 class="subsectionHead"><span class="titlemark">7.1.1 </span> <a + id="x1-620007.1.1"></a>Netlist generation for PCB</h4> +<a + id="dx1-62001"></a> +<a + id="dx1-62002"></a> +<!--l. 39--><p class="noindent" >The netlist for PCB is different from that for simulation. To generate netlist for PCB, click on +the <span +class="cmti-10x-x-109">Generate netlist </span>tool from the top toolbar in Schematic editor. In the Netlist window, +under the tab <span +class="cmti-10x-x-109">Pcbnew</span>, <a + id="dx1-62003"></a>click on the button <span +class="cmti-10x-x-109">Netlist</span>. This is shown in Fig. <a +href="#x1-620042">7.2<!--tex4ht:ref: netlistpcb --></a>. Click on +<span +class="cmti-10x-x-109">Save </span>in the Save netlist file dialog box that opens up. Do not change the directory +or the name of the netlist file. Save the schematic and close the schematic editor. +<hr class="figure"><div class="figure" +> + +<a + id="x1-620042"></a> + + +<!--l. 49--><p class="noindent" ><img +src="figures/netlistpcb.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.2: </span><span +class="content">Netlist generation for PCB</span></div><!--tex4ht:label?: x1-620042 --> + +<!--l. 52--><p class="indent" > </div><hr class="endfigure"> +<!--l. 53--><p class="indent" > <span +class="cmti-10x-x-109">Note that the netlist for PCB has an extension </span><span +class="cmtt-10x-x-109">.net</span><span +class="cmti-10x-x-109">. The netlist created for simulation</span> +<span +class="cmti-10x-x-109">has an extension </span><span +class="cmtt-10x-x-109">.cir</span>. + <h4 class="subsectionHead"><span class="titlemark">7.1.2 </span> <a + id="x1-630007.1.2"></a>Mapping of components using Footprint Editor</h4> +<a + id="dx1-63001"></a> +<a + id="dx1-63002"></a> +<a + id="dx1-63003"></a> +<!--l. 60--><p class="noindent" >Once the netlist for PCB is created, one needs to map each component in the netlist to a +footprint. The tool <span +class="cmti-10x-x-109">Footprint Editor </span>is used for this. eSim uses <span +class="cmtt-10x-x-109">CvPcb </span>as its footprint editor. +<span +class="cmtt-10x-x-109">CvPcb </span>is the footprint editor tool in KiCad. <a + id="dx1-63004"></a> +<!--l. 65--><p class="noindent" > + <h4 class="subsectionHead"><span class="titlemark">7.1.3 </span> <a + id="x1-640007.1.3"></a>Familiarising the Footprint Editor tool</h4> +<a + id="dx1-64001"></a> +<!--l. 68--><p class="noindent" >If one opens the <span +class="cmti-10x-x-109">Footprint Editor </span>after creating the <span +class="cmtt-10x-x-109">.net </span>netlist file, the Footprint editor as +shown in Fig. <a +href="#x1-640023">7.3<!--tex4ht:ref: fe --></a> will be obtained. The menu bar and toolbars and the panes are marked in +this figure. The menu bar will be available in the top left corner. The left pane has a list of +components in the netlist file and the right pane has a list of available footprints for each +component. <hr class="figure"><div class="figure" +> + +<a + id="x1-640023"></a> + + +<!--l. 76--><p class="noindent" ><img +src="figures/fe.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.3: </span><span +class="content">Footprint editor with the menu bar, toolbar, left pane and right pane +marked</span></div><!--tex4ht:label?: x1-640023 --> + +<!--l. 79--><p class="indent" > </div><hr class="endfigure"> +<!--l. 80--><p class="indent" > <span +class="cmti-10x-x-109">Note that if the Footprint Editor is opened before creating a ‘.net’ file, then the left and</span> +<span +class="cmti-10x-x-109">right panes will be empty</span>. + <h5 class="subsubsectionHead"><a + id="x1-650007.1.3"></a>Toolbar</h5> +<!--l. 83--><p class="noindent" >Some of the important tools in the toolbar are shown in Fig. <a +href="#x1-650014">7.4<!--tex4ht:ref: tb_fe --></a>. They are explained below: +<hr class="figure"><div class="figure" +> + +<a + id="x1-650014"></a> + + +<!--l. 87--><p class="noindent" ><img +src="figures/tb_fe.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.4: </span><span +class="content">Some important tools in the toolbar</span></div><!--tex4ht:label?: x1-650014 --> + +<!--l. 90--><p class="indent" > </div><hr class="endfigure"> + <dl class="compactenum"><dt class="compactenum"> + 1. </dt><dd +class="compactenum">Save netlist and footprint files - Save the netlist and the footprints that are + associated with it. + </dd><dt class="compactenum"> + 2. </dt><dd +class="compactenum">View selected footprint - View the selected footprint in 2D. See Sec. <a +href="#x1-660007.1.4">7.1.4<!--tex4ht:ref: viewfp --></a> for more + details. + </dd><dt class="compactenum"> + 3. </dt><dd +class="compactenum">Automatic footprint association - Perform footprint association for each + component automatically. Footprints will be selected from the list of footprints + available. + </dd><dt class="compactenum"> + 4. </dt><dd +class="compactenum">Delete all associations - Delete all the footprint associations made + </dd><dt class="compactenum"> + 5. </dt><dd +class="compactenum">Display filtered footprint list - Display a filtered list of footprints suitable to the + selected component + </dd><dt class="compactenum"> + 6. </dt><dd +class="compactenum">Display full footprint list - Display the list of all footprints available (without + filtering)</dd></dl> + <h4 class="subsectionHead"><span class="titlemark">7.1.4 </span> <a + id="x1-660007.1.4"></a>Viewing footprints in 2D and 3D</h4> +<a + id="dx1-66001"></a> +<a + id="dx1-66002"></a> +<!--l. 111--><p class="noindent" >To view a footprint in 2D, select it from the right pane and click on <span +class="cmti-10x-x-109">View selected footprint</span> +from the menu bar. Let us view the footprint for <span +class="cmtt-10x-x-109">SM1210</span>. Choose SM1210 from +the right pane as shown in Fig. <a +href="#x1-660035">7.5<!--tex4ht:ref: sm --></a>. On clicking the <span +class="cmti-10x-x-109">View selected footprint </span>tool, +the <span +class="cmtt-10x-x-109">Footprint </span>window with the view in 2D will be displayed. Click on the <span +class="cmti-10x-x-109">3D</span> +tool in the <span +class="cmtt-10x-x-109">Footprint </span>window, as shown in Fig. <a +href="#x1-660046">7.6<!--tex4ht:ref: 3d --></a>. A top view of the selected +footprint in 3D is obtained. Click on the footprint and rotate it using mouse to get 3D +views from various angles. One such side view of the footprint in 3D is shown in +Fig. <a +href="#x1-660057">7.7<!--tex4ht:ref: 3dv --></a>. +<!--l. 122--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-660035"></a> + + +<!--l. 124--><p class="noindent" ><img +src="figures/sm.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.5: </span><span +class="content">Viewing footprint for SM1210: 1. Choose the footprint SM1210 from the +right pane, 2. Click on <span +class="cmti-10x-x-109">View selected footprint</span></span></div><!--tex4ht:label?: x1-660035 --> + +<!--l. 128--><p class="indent" > </div><hr class="endfigure"> +<!--l. 129--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-660046"></a> + + +<!--l. 131--><p class="noindent" ><img +src="figures/3d.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.6: </span><span +class="content">Footprint view in 2D. Click on <span +class="cmti-10x-x-109">3D </span>to get 3D view</span></div><!--tex4ht:label?: x1-660046 --> + +<!--l. 134--><p class="indent" > </div><hr class="endfigure"> +<!--l. 135--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-660057"></a> + + +<!--l. 137--><p class="noindent" ><img +src="figures/3dv.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.7: </span><span +class="content">Side view of the footprint in 3D</span></div><!--tex4ht:label?: x1-660057 --> + +<!--l. 140--><p class="indent" > </div><hr class="endfigure"> + <h4 class="subsectionHead"><span class="titlemark">7.1.5 </span> <a + id="x1-670007.1.5"></a>Mapping of components in the RC circuit</h4> +<!--l. 143--><p class="noindent" >Click on <span +class="cmtt-10x-x-109">C1 </span>from the left pane. Choose the footprint <span +class="cmti-10x-x-109">C1 </span>from the right pane by double +clicking on it. Click on connector <span +class="cmtt-10x-x-109">P1 </span>from the left pane. Choose the footprint <span +class="cmti-10x-x-109">SIL-2 </span>from the +right pane by double clicking on it. Similarly choose the footprint <span +class="cmti-10x-x-109">R3 </span>for the resistor <span +class="cmtt-10x-x-109">R1</span>. The +footprint mapping is shown in Fig. <a +href="#x1-670018">7.8<!--tex4ht:ref: map --></a>. Save the footprint association by clicking on the <span +class="cmti-10x-x-109">Save</span> +<span +class="cmti-10x-x-109">netlist and footprint files </span>tool from the <span +class="cmtt-10x-x-109">CvPcb </span>toolbar. The <span +class="cmtt-10x-x-109">Save Net and component List</span> +window appears. Browse to the directory where the schematic file for this project is saved and +click on <span +class="cmti-10x-x-109">Save</span>. The netlist gets saved and the <span +class="cmti-10x-x-109">Footprint Editor </span>window closes automatically. +<hr class="figure"><div class="figure" +> + +<a + id="x1-670018"></a> + + +<!--l. 156--><p class="noindent" ><img +src="figures/map.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.8: </span><span +class="content">Footprint mapping done</span></div><!--tex4ht:label?: x1-670018 --> + +<!--l. 159--><p class="indent" > </div><hr class="endfigure"> +<!--l. 160--><p class="indent" > <span +class="cmti-10x-x-109">Note that one needs to browse to the directory where the schematic file is saved and save</span> +<span +class="cmti-10x-x-109">the ‘.net’ file in the same directory</span>. + <h3 class="sectionHead"><span class="titlemark">7.2 </span> <a + id="x1-680007.2"></a>Creation of PCB layout</h3> +<a + id="dx1-68001"></a> +<a + id="dx1-68002"></a> +<!--l. 165--><p class="noindent" >The next step is to place the footprints and lay tracks between them to get the layout. This is +done using the <span +class="cmti-10x-x-109">Layout Editor </span>tool. eSim uses <span +class="cmtt-10x-x-109">Pcbnew</span>, the layout creation tool in KiCad, as its +layout editor. +<!--l. 170--><p class="noindent" > + <h4 class="subsectionHead"><span class="titlemark">7.2.1 </span> <a + id="x1-690007.2.1"></a>Familiarising the Layout Editor tool</h4> +<a + id="dx1-69001"></a> +<!--l. 173--><p class="noindent" >The layout editor with the various menu bar and toolbars is shown in Fig. <a +href="#x1-690029">7.9<!--tex4ht:ref: pcbnew --></a>. +<hr class="figure"><div class="figure" +> + +<a + id="x1-690029"></a> + + +<!--l. 177--><p class="noindent" ><img +src="figures/pcbnew.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.9: </span><span +class="content">Layout editor with menu bar, toolbars and layer options marked</span></div><!--tex4ht:label?: x1-690029 --> + +<!--l. 180--><p class="indent" > </div><hr class="endfigure"> +<!--l. 181--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-6900310"></a> + + +<!--l. 183--><p class="noindent" ><img +src="figures/toptble.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.10: </span><span +class="content">Top toolbar with important tools marked</span></div><!--tex4ht:label?: x1-6900310 --> + +<!--l. 186--><p class="indent" > </div><hr class="endfigure"> + <h5 class="subsubsectionHead"><a + id="x1-700007.2.1"></a>Top toolbar</h5> +<!--l. 189--><p class="noindent" >Some of the important menu options in the top menu bar are shown in Fig. <a +href="#x1-6900310">7.10<!--tex4ht:ref: toptble --></a>. They are +explained below: + <dl class="compactenum"><dt class="compactenum"> + 1. </dt><dd +class="compactenum">Save board - Save the printed circuit board + </dd><dt class="compactenum"> + 2. </dt><dd +class="compactenum">Module editor - Open module editor to edit footprint modules or libraries + </dd><dt class="compactenum"> + 3. </dt><dd +class="compactenum">Read netlist - Import the netlist whose layout needs to be created. + </dd><dt class="compactenum"> + 4. </dt><dd +class="compactenum">Perform design rules check - Check for design rules, unconnected nets, etc., in the + layout. + </dd><dt class="compactenum"> + 5. </dt><dd +class="compactenum">Select working layer - Selection of working layer + </dd><dt class="compactenum"> + 6. </dt><dd +class="compactenum">Show active layer selections and select layer pair for route and place - Select layer + in top and bottom layers. It also shows the currently active layer selections. + </dd><dt class="compactenum"> + 7. </dt><dd +class="compactenum">Mode footprint: Manual/automatic move and place - Move and place modules</dd></dl> +<!--l. 207--><p class="noindent" > + <h4 class="subsectionHead"><span class="titlemark">7.2.2 </span> <a + id="x1-710007.2.2"></a>Hotkeys</h4> +<a + id="dx1-71001"></a> +<!--l. 209--><p class="noindent" >A list of hotkeys are given below: + <dl class="compactenum"><dt class="compactenum"> + 1. </dt><dd +class="compactenum">F1 - Zoom in + </dd><dt class="compactenum"> + 2. </dt><dd +class="compactenum">F2 - Zoom out + </dd><dt class="compactenum"> + 3. </dt><dd +class="compactenum">Delete - Delete Track or Footprint + </dd><dt class="compactenum"> + 4. </dt><dd +class="compactenum">X - Add new track + </dd><dt class="compactenum"> + 5. </dt><dd +class="compactenum">V - Add Via + </dd><dt class="compactenum"> + 6. </dt><dd +class="compactenum">M - Move Item + + </dd><dt class="compactenum"> + 7. </dt><dd +class="compactenum">F - Flip Footprint + </dd><dt class="compactenum"> + 8. </dt><dd +class="compactenum">R - Rotate Item + </dd><dt class="compactenum"> + 9. </dt><dd +class="compactenum">G - Drag Footprint + </dd><dt class="compactenum"> + 10. </dt><dd +class="compactenum">Ctrl+Z - Undo + </dd><dt class="compactenum"> + 11. </dt><dd +class="compactenum">E - Edit Item</dd></dl> +<!--l. 223--><p class="noindent" >The list can be viewed by selecting <span +class="cmti-10x-x-109">Preferences </span>from the top menu bar and choosing <span +class="cmti-10x-x-109">List Current</span> +<span +class="cmti-10x-x-109">Keys </span>from the option <span +class="cmti-10x-x-109">Hotkeys</span>. +<!--l. 227--><p class="noindent" > + <h4 class="subsectionHead"><span class="titlemark">7.2.3 </span> <a + id="x1-720007.2.3"></a>PCB design example using RC circuit</h4> +<a + id="dx1-72001"></a> +<!--l. 228--><p class="noindent" >Click on <span +class="cmti-10x-x-109">Layout Editor </span>from the eSim toolbar. Click on <span +class="cmti-10x-x-109">Read Netlist </span>tool from the top +toolbar. Click on <span +class="cmti-10x-x-109">Browse Netlist files </span>on the Netlist window that opens up. Select the <span +class="cmtt-10x-x-109">.net </span>file +that was modified after assigning footprints. Click on <span +class="cmti-10x-x-109">Open</span>. Now Click on <span +class="cmti-10x-x-109">Read Current</span> +<span +class="cmti-10x-x-109">Netlist </span>on the Netlist window. The message area in the Netlist window says that +the RC_pcb.net has been read. The sequence of operations is shown in Fig. <a +href="#x1-7200411">7.11<!--tex4ht:ref: brnet --></a>. +<a + id="dx1-72002"></a><a + id="dx1-72003"></a><hr class="figure"><div class="figure" +> + +<a + id="x1-7200411"></a> + + +<!--l. 239--><p class="noindent" ><img +src="figures/rcpcb.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.11: </span><span +class="content">Importing netlist file to layout editor: 1. Browse netlist Files, 2. Choose +the RC_pcb.net file, 3. Read Netlist file, 4. Close</span></div><!--tex4ht:label?: x1-7200411 --> + +<!--l. 243--><p class="indent" > </div><hr class="endfigure"> +<!--l. 244--><p class="indent" > The footprint modules will now be imported to the top left hand corner of the layout +editor window. This is shown in Fig. <a +href="#x1-7200512">7.12<!--tex4ht:ref: netlisttop --></a>. <hr class="figure"><div class="figure" +> + +<a + id="x1-7200512"></a> + + +<!--l. 248--><p class="noindent" ><img +src="figures/netlisttop.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.12: </span><span +class="content">Footprint modules imported to top left corner of layout editor window</span></div><!--tex4ht:label?: x1-7200512 --> + +<!--l. 251--><p class="indent" > </div><hr class="endfigure"> +<!--l. 252--><p class="indent" > Zoom in to the top left corner by pressing the key <span +class="cmtt-10x-x-109">F1 </span>or using the scroll button of the +mouse. The zoomed in version of the imported netlist is shown in Fig. <a +href="#x1-7200613">7.13<!--tex4ht:ref: zoom --></a>. +<!--l. 256--><p class="indent" > Let us now place this in the center of the layout editor window. <hr class="figure"><div class="figure" +> + +<a + id="x1-7200613"></a> + + +<!--l. 260--><p class="noindent" ><img +src="figures/zoom.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.13: </span><span +class="content">Zoomed in version of the imported netlist</span></div><!--tex4ht:label?: x1-7200613 --> + +<!--l. 263--><p class="indent" > </div><hr class="endfigure"> +<!--l. 264--><p class="indent" > Click on <span +class="cmti-10x-x-109">Mode footprint: Manual/automatic move and place </span>tool from the top toolbar. +Place the cursor near the center of the layout editor window. Right click and choose <span +class="cmti-10x-x-109">Glob</span> +<span +class="cmti-10x-x-109">move and place</span>. Choose <span +class="cmti-10x-x-109">move all modules</span>. The sequence of operations is shown in Fig. <a +href="#x1-7200714">7.14<!--tex4ht:ref: movep --></a>. +Click on <span +class="cmti-10x-x-109">Yes </span>on the confirmation window to move the modules. Zoom in using the F1 key. +The current placement of components after zooming in is shown in Fig. <a +href="#x1-72008r1">7.15a<!--tex4ht:ref: curplace --></a>. +<hr class="figure"><div class="figure" +> + +<a + id="x1-7200714"></a> + + +<!--l. 273--><p class="noindent" ><img +src="figures/movep.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.14: </span><span +class="content">Moving and placing modules to the center of layout editor. 1. Click on +<span +class="cmti-10x-x-109">Mode footprint: Manual/automatic move and place</span>, 2. Place cursor at center of layout +editor and right click on it 3. Choose <span +class="cmti-10x-x-109">Glob Move and Place </span>and then choose <span +class="cmti-10x-x-109">Move All</span> +<span +class="cmti-10x-x-109">Modules.</span></span></div><!--tex4ht:label?: x1-7200714 --> + +<!--l. 280--><p class="indent" > </div><hr class="endfigure"> +<!--l. 287--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-7201015"></a> + +<a + id="x1-72008r1"></a> +<!--l. 291--><p class="noindent" > <img +src="figures/curplace.png" alt="PIC" +> +<span +class="cmr-9">(a)</span> +<span +class="cmr-9">Zoomed</span> +<span +class="cmr-9">in</span> +<span +class="cmr-9">version</span> +<span +class="cmr-9">of the</span> +<span +class="cmr-9">current</span> +<span +class="cmr-9">placement</span> +<span +class="cmr-9">after</span> +<span +class="cmr-9">moving</span> +<span +class="cmr-9">modules</span> +<span +class="cmr-9">to the</span> +<span +class="cmr-9">center</span> +<span +class="cmr-9">of the</span> +<span +class="cmr-9">layout</span> +<span +class="cmr-9">editor</span> <a + id="x1-72009r2"></a> <img +src="figures/fplace.png" alt="PIC" +> + <span +class="cmr-9">(b)</span> + <span +class="cmr-9">Final</span> + <span +class="cmr-9">placement</span> + <span +class="cmr-9">of</span> + <span +class="cmr-9">footprints</span> + <span +class="cmr-9">after</span> + <span +class="cmr-9">rotating</span> + <span +class="cmr-9">and</span> + <span +class="cmr-9">moving</span> + <span +class="cmr-9">P1</span> +<br /> <div class="caption" +><span class="id">Figure 7.15: </span><span +class="content">Different stages of placement of modules on PCB</span></div><!--tex4ht:label?: x1-7201015 --> + +<!--l. 296--><p class="indent" > </div><hr class="endfigure"> +<!--l. 297--><p class="indent" > We need to arrange the modules properly to lay tracks. Rotate the connector P1 by +placing the cursor on top of P1 and pressing R. Move it by placing the cursor on top of it and +pressing M. The final placement is shown in Fig. <a +href="#x1-72009r2">7.15b<!--tex4ht:ref: fplace --></a>. <a + id="dx1-72011"></a> +<!--l. 303--><p class="indent" > Let us now lay the tracks. Let us first change the track width. Click on <span +class="cmti-10x-x-109">Design rules </span>from +the top menu bar. Click on <span +class="cmti-10x-x-109">Design rules</span>. This is shown in Fig. <a +href="#x1-7201416">7.16<!--tex4ht:ref: drules --></a>. The <span +class="cmti-10x-x-109">Design Rules Editor</span> +window opens up. Here one can edit the various design rules. Double click on the track width +field to edit it. Type 0.8 and press <span +class="cmtt-10x-x-109">Enter</span>. Click on OK. Fig. <a +href="#x1-7201517">7.17<!--tex4ht:ref: druleedit --></a> shows the sequence of +operations. <a + id="dx1-72012"></a><a + id="dx1-72013"></a> <hr class="figure"><div class="figure" +> + +<a + id="x1-7201416"></a> + + +<!--l. 313--><p class="noindent" ><img +src="figures/drules.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.16: </span><span +class="content">Choose <span +class="cmti-10x-x-109">Design Rules </span>from the top menu bar and <span +class="cmti-10x-x-109">Design Rules </span>again</span></div><!--tex4ht:label?: x1-7201416 --> + +<!--l. 317--><p class="indent" > </div><hr class="endfigure"> +<!--l. 318--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-7201517"></a> + + +<!--l. 320--><p class="noindent" ><img +src="figures/druleedit.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.17: </span><span +class="content">Changing the track width: 1. Double click on <span +class="cmti-10x-x-109">Track Width </span>field and type +0.8, 2. Click on <span +class="cmti-10x-x-109">OK</span></span></div><!--tex4ht:label?: x1-7201517 --> + +<!--l. 324--><p class="indent" > </div><hr class="endfigure"> +<!--l. 326--><p class="indent" > Click on <span +class="cmti-10x-x-109">Back </span>from the <span +class="cmti-10x-x-109">Layer </span>options as shown in Fig. <a +href="#x1-7201718">7.18<!--tex4ht:ref: layer --></a>. <a + id="dx1-72016"></a><hr class="figure"><div class="figure" +> + +<a + id="x1-7201718"></a> + + +<!--l. 330--><p class="noindent" ><img +src="figures/layer.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.18: </span><span +class="content">Choosing the copper layer <span +class="cmti-10x-x-109">Back</span></span></div><!--tex4ht:label?: x1-7201718 --> + +<!--l. 333--><p class="indent" > </div><hr class="endfigure"> +<!--l. 334--><p class="indent" > Let us now start laying the tracks. Place the cursor above the left terminal of R1 +in the layout editor window. Press the key <span +class="cmtt-10x-x-109">x</span>. Move the cursor down and double +click on the left terminal of C1. A track is formed. This is shown in Fig. <a +href="#x1-72018r1">7.19a<!--tex4ht:ref: track1 --></a>. +<hr class="figure"><div class="figure" +> + +<a + id="x1-7202119"></a> + +<a + id="x1-72018r1"></a> +<!--l. 342--><p class="noindent" > <img +src="figures/track1.png" alt="PIC" +> +<span +class="cmr-9">(a) A</span> +<span +class="cmr-9">track</span> +<span +class="cmr-9">formed</span> +<span +class="cmr-9">between</span> +<span +class="cmr-9">resistor</span> +<span +class="cmr-9">and</span> +<span +class="cmr-9">capacitor</span> <a + id="x1-72019r2"></a> <img +src="figures/track2.png" alt="PIC" +> + <span +class="cmr-9">(b) A</span> + <span +class="cmr-9">track</span> + <span +class="cmr-9">formed</span> + <span +class="cmr-9">between</span> + <span +class="cmr-9">capacitor</span> + <span +class="cmr-9">and</span> + <span +class="cmr-9">connector</span> <a + id="x1-72020r3"></a> <img +src="figures/track3.png" alt="PIC" +> + <span +class="cmr-9">(c) A</span> + <span +class="cmr-9">track</span> + <span +class="cmr-9">formed</span> + <span +class="cmr-9">between</span> + <span +class="cmr-9">connector</span> + <span +class="cmr-9">and</span> + <span +class="cmr-9">resistor</span> +<br /> <div class="caption" +><span class="id">Figure 7.19: </span><span +class="content">Different stages of laying tracks during PCB design</span></div><!--tex4ht:label?: x1-7202119 --> + +<!--l. 350--><p class="indent" > </div><hr class="endfigure"> +<!--l. 351--><p class="indent" > Similarly lay the track between capacitor C1 and connector P1 as shown in +Fig. <a +href="#x1-72019r2">7.19b<!--tex4ht:ref: track2 --></a>. The last track needs to be laid at an angle. To do so, place the cursor +above the second terminal of R1. Press the key x and move the cursor diagonally +down. Double click on the other terminal of the connector. The track will be laid +as shown in Fig. <a +href="#x1-72020r3">7.19c<!--tex4ht:ref: track3 --></a>. All tracks are now laid. The next step is to create PCB +edges. +<!--l. 359--><p class="indent" > Choose <span +class="cmti-10x-x-109">PCB</span><span +class="cmti-10x-x-109">_edges </span>from the <span +class="cmti-10x-x-109">Layer </span>options to add edges. Click on <span +class="cmti-10x-x-109">Add graphic line or</span> +<span +class="cmti-10x-x-109">polygon </span>from the toolbar on the left. Fig. <a +href="#x1-7202320">7.20<!--tex4ht:ref: pcbedges --></a> shows the sequence of operations. Let us now +start drawing edges for PCB. <a + id="dx1-72022"></a><hr class="figure"><div class="figure" +> + +<a + id="x1-7202320"></a> + + +<!--l. 366--><p class="noindent" ><img +src="figures/pcbedges.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.20: </span><span +class="content">Creating PCB edges: 1. Choose <span +class="cmti-10x-x-109">PCB</span><span +class="cmti-10x-x-109">_Edges </span>from <span +class="cmti-10x-x-109">Layer </span>options 2. Choose +<span +class="cmti-10x-x-109">Add graphic line or polygon </span>from left toolbar</span></div><!--tex4ht:label?: x1-7202320 --> + +<!--l. 371--><p class="indent" > </div><hr class="endfigure"> +<!--l. 372--><p class="indent" > Click to the left of the layout. Move cursor horizontally to the right. Click once to change +orientation. Move cursor vertically down. Draw the edges as shown in Fig. <a +href="#x1-7202421">7.21<!--tex4ht:ref: pcbed --></a>. Double click +to finish drawing the edges. <hr class="figure"><div class="figure" +> + +<a + id="x1-7202421"></a> + + +<!--l. 378--><p class="noindent" ><img +src="figures/pcbed.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.21: </span><span +class="content">PCB edges drawn</span></div><!--tex4ht:label?: x1-7202421 --> + +<!--l. 381--><p class="indent" > </div><hr class="endfigure"> +<!--l. 383--><p class="indent" > Click on <span +class="cmti-10x-x-109">Perform design rules check </span>from the top toolbar to check for design rules. The +<span +class="cmti-10x-x-109">DRC Control </span>window opens up. Click on <span +class="cmti-10x-x-109">Start DRC</span>. There are no errors under the <span +class="cmtt-10x-x-109">Error</span> +<span +class="cmtt-10x-x-109">messages </span>tab. Click on <span +class="cmti-10x-x-109">OK </span>to close DRC control window. Fig. <a +href="#x1-7202622">7.22<!--tex4ht:ref: drc --></a> shows the sequence of +operations. <a + id="dx1-72025"></a><hr class="figure"><div class="figure" +> + +<a + id="x1-7202622"></a> + + +<!--l. 391--><p class="noindent" ><img +src="figures/drc.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.22: </span><span +class="content">Performing design rules check: 1. Click on <span +class="cmti-10x-x-109">Start DRC</span>, 2. Click on <span +class="cmti-10x-x-109">Ok</span></span></div><!--tex4ht:label?: x1-7202622 --> + +<!--l. 395--><p class="indent" > </div><hr class="endfigure"> +<!--l. 396--><p class="indent" > Click on <span +class="cmti-10x-x-109">Save board </span>on the top toolbar. +<!--l. 398--><p class="indent" > To generate Gerber files, click on <span +class="cmti-10x-x-109">File </span>from the top menu bar. Click on <span +class="cmti-10x-x-109">Plot</span>. This is shown +in Fig. <a +href="#x1-7202823">7.23<!--tex4ht:ref: plot --></a>. The plot window opens up. One can choose which layers to plot by +selecting/deselecting them from the <span +class="cmtt-10x-x-109">Layers </span>pane on the left side. One can also choose the +format used to plot them. Choose <span +class="cmti-10x-x-109">Gerber</span>. The output directory of the plots created +can also be chosen. By default, it is the project directory. Some more options can +be chosen in this window. Click on <span +class="cmti-10x-x-109">Plot</span>. The message window shows the location +in which the Gerber files are created. Click on <span +class="cmti-10x-x-109">Close</span>. This is shown in Fig. <a +href="#x1-7202924">7.24<!--tex4ht:ref: plot2 --></a>. +<a + id="dx1-72027"></a><hr class="figure"><div class="figure" +> + +<a + id="x1-7202823"></a> + + +<!--l. 411--><p class="noindent" ><img +src="figures/plot.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.23: </span><span +class="content">Choosing <span +class="cmti-10x-x-109">Plot </span>from the <span +class="cmti-10x-x-109">File </span>menu</span></div><!--tex4ht:label?: x1-7202823 --> + +<!--l. 414--><p class="indent" > </div><hr class="endfigure"> +<!--l. 415--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-7202924"></a> + + +<!--l. 417--><p class="noindent" ><img +src="figures/plot2.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 7.24: </span><span +class="content">Creating Gerber files: 1. Choose <span +class="cmti-10x-x-109">Gerber </span>as the plot format, 2. Click on +<span +class="cmti-10x-x-109">Plot</span>. Message window shows location in which Gerber files are created, 3. Click on <span +class="cmti-10x-x-109">Close</span></span></div><!--tex4ht:label?: x1-7202924 --> + +<!--l. 422--><p class="indent" > </div><hr class="endfigure"> +<!--l. 423--><p class="indent" > The PCB design of RC circuit is now complete. To know more about Pcbnew, refer to <span class="cite"> [<span +class="cmbx-10x-x-109">?</span>]</span> +or <span class="cite"> [<span +class="cmbx-10x-x-109">?</span>]</span>. + + <h2 class="chapterHead"><span class="titlemark">Chapter 8</span><br /><a + id="x1-730008"></a>Model Editor</h2> +<!--l. 3--><p class="noindent" >Spice based simulators include a feature which allows accurate modeling of semiconductor +devices such as diodes, transistors etc. eSim Model Builder provides a facility to define a new +model for devices such as diodes, MOSFET, BJT, JFET, IGBT, Magnetic core etc. Model +Builder in eSim lets the user enter the values of parameters depending on the type of device +for which a model is required. The parameter values can be obtained from the data-sheet +of the device. A newly created model can be exported to the model library and +one can import it for different projects, whenever required. Model Builder also +provides a facility to edit existing models. The GUI of the model editor is as shown in +Fig. <a +href="#x1-730011">8.1<!--tex4ht:ref: modeleditor --></a> +<!--l. 14--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-730011"></a> + + +<!--l. 16--><p class="noindent" ><img +src="figures/modeleditor.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 8.1: </span><span +class="content">Model Editor</span></div><!--tex4ht:label?: x1-730011 --> + +<!--l. 19--><p class="indent" > </div><hr class="endfigure"> + <h3 class="sectionHead"><span class="titlemark">8.1 </span> <a + id="x1-740008.1"></a>Creating New Model Library </h3> +<!--l. 23--><p class="noindent" >eSim lets used create new model libraries based on the template model libraries. on selecting +<span +class="cmti-10x-x-109">New </span>button the window is popped to name the new library file. The library file has to be +unique otherwise the error message appears on the window. +<!--l. 26--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-740012"></a> + + +<!--l. 28--><p class="noindent" ><img +src="figures/modeleditor_new.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 8.2: </span><span +class="content">Creating New Model Library</span></div><!--tex4ht:label?: x1-740012 --> + +<!--l. 31--><p class="indent" > </div><hr class="endfigure"> +<!--l. 33--><p class="indent" > After the OK button is pressed the type of model library to be created is chosen by +selecting one of the types on the left hand side i.e. <span +class="cmtt-10x-x-109">Diode, BJT, MOS, JFET, IGBT,</span> +<span +class="cmtt-10x-x-109">Magnetic Core</span>. The template model library is then opened in the tabular form. As shown in +Fig. <a +href="#x1-740023">8.3<!--tex4ht:ref: modelnew --></a> +<!--l. 35--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-740023"></a> + + +<!--l. 37--><p class="noindent" ><img +src="figures/modelnew.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 8.3: </span><span +class="content">Choosing the Template Model Library </span></div><!--tex4ht:label?: x1-740023 --> + +<!--l. 40--><p class="indent" > </div><hr class="endfigure"> +<!--l. 42--><p class="indent" > The new parameters can be added or a current parameters can be removed using <span +class="cmti-10x-x-109">ADD</span> +and <span +class="cmti-10x-x-109">REMOVE </span>buttons. Also the values of parameters can be changed in the table. The +adding and removing of the parameters in a library files is as shown in the Fig. <a +href="#x1-740034">8.4<!--tex4ht:ref: modeladd --></a> and +Fig. <a +href="#x1-740045">8.5<!--tex4ht:ref: modelremove --></a> +<!--l. 44--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-740034"></a> + + +<!--l. 46--><p class="noindent" ><img +src="figures/modeladd.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 8.4: </span><span +class="content">Adding the Paramter in a Library </span></div><!--tex4ht:label?: x1-740034 --> + +<!--l. 49--><p class="indent" > </div><hr class="endfigure"> +<!--l. 51--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-740045"></a> + + +<!--l. 53--><p class="noindent" ><img +src="figures/modelremove.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 8.5: </span><span +class="content">Removing a Parameter from a Library </span></div><!--tex4ht:label?: x1-740045 --> + +<!--l. 56--><p class="indent" > </div><hr class="endfigure"> +<!--l. 58--><p class="indent" > After the editing of the model library is done the file can be saved selecting the <span +class="cmti-10x-x-109">SAVE</span> +button. These libraries are saved in the <span +class="cmti-10x-x-109">Use Libraries </span>folder under <span +class="cmti-10x-x-109">DecviceModelLibrary </span>folder +in the project folder. + <h3 class="sectionHead"><span class="titlemark">8.2 </span> <a + id="x1-750008.2"></a>Editing Current Model Library</h3> +<!--l. 61--><p class="noindent" >The current model library can be saved using <span +class="cmti-10x-x-109">EDIT </span>option. On clicking the <span +class="cmti-10x-x-109">EDIT </span>button the +file dialog opens where all the library files are saved as shown in Fig. <a +href="#x1-750016">8.6<!--tex4ht:ref: modeledit --></a> +<!--l. 63--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-750016"></a> + + +<!--l. 65--><p class="noindent" ><img +src="figures/modeledit.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 8.6: </span><span +class="content">Editing Existing Model Library</span></div><!--tex4ht:label?: x1-750016 --> + +<!--l. 68--><p class="indent" > </div><hr class="endfigure"> +<!--l. 70--><p class="indent" > Further on clicking the <span +class="cmti-10x-x-109">SAVE </span>button the edited model library is saved in the <span +class="cmti-10x-x-109">Use</span> +<span +class="cmti-10x-x-109">Libraries </span>folder under <span +class="cmti-10x-x-109">DecviceModelLibrary </span>folder in the project folder. + <h3 class="sectionHead"><span class="titlemark">8.3 </span> <a + id="x1-760008.3"></a>Converting Library file to XML file</h3> +<!--l. 73--><p class="noindent" >eSim can not read the model library file in the .lib form. The file needs to be converted into +XML so as to make it readable and editable in model editor. Any new netlist that user wants +to use in the eSim need to be convertedinto xml before using it in a project. hence eSim +provides us to upload the new netlist which converts in into xml. on clicking UPLOAD button +the netlist can be uploaded from any location and further on saving the file the model library +can be saved in the Use Libraries folder under DecviceModelLibrary folder in the project +folder with different name. + +<!--l. 1--><p class="indent" > + + <h2 class="chapterHead"><span class="titlemark">Chapter 9</span><br /><a + id="x1-770009"></a>Sub-Circuit Builder</h2> +<!--l. 3--><p class="noindent" >Subcircuit is a way to implement hierarchical modeling. Once a subcircuit for a compo- nent +is created, it can be used in other circuits. eSim provides an easy way to create a subcircuit. +Thw Following Fig. <a +href="#x1-770011">9.1<!--tex4ht:ref: subcircuit_mainwin --></a> shows the window that is opened when the Sub-CIrcuit tool is chosen +from the toolbar. <hr class="figure"><div class="figure" +> + +<a + id="x1-770011"></a> + + +<!--l. 8--><p class="noindent" ><img +src="figures/subcircuit_window.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 9.1: </span><span +class="content">Sub circuit Window</span></div><!--tex4ht:label?: x1-770011 --> + +<!--l. 11--><p class="indent" > </div><hr class="endfigure"> + <h3 class="sectionHead"><span class="titlemark">9.1 </span> <a + id="x1-780009.1"></a>Creating a Sub-Circuit</h3> +<!--l. 13--><p class="noindent" >Let us take an example of Half-adder circuit. To create a new sub circuit select the New +Subcircuit Schematic.Fig. <a +href="#x1-780012">9.2<!--tex4ht:ref: halfadder --></a> shows the half-adder circuit and Fig. <a +href="#x1-780023">9.3<!--tex4ht:ref: block --></a> shows the block of the +sub circuit included in the main circuit. <hr class="figure"><div class="figure" +> + +<a + id="x1-780012"></a> + + +<!--l. 16--><p class="noindent" ><img +src="figures/half_adder.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 9.2: </span><span +class="content">Half-Adder Sub-circuit </span></div><!--tex4ht:label?: x1-780012 --> + +<!--l. 19--><p class="indent" > </div><hr class="endfigure"> +<!--l. 20--><p class="indent" > NOTE: All the input and output of the sub circuits are connected to the port component. +<hr class="figure"><div class="figure" +> + +<a + id="x1-780023"></a> + + +<!--l. 23--><p class="noindent" ><img +src="figures/halfadderblock.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure 9.3: </span><span +class="content">Half-Adder Sub-circuit Block </span></div><!--tex4ht:label?: x1-780023 --> + +<!--l. 26--><p class="indent" > </div><hr class="endfigure"> +<!--l. 27--><p class="indent" > After creating the schematic kicad netlist is generated as explained in section and convert +kicad to Ngspice where cir.out and .sub files are generated. The number of input and +output ports of the subcircuit is to matched with number of connections in the +main circuit. eSim provides this validation of mapping of the sub circuit ports. +Also the respective input and output ports can be checked by reading the .sub +file. + +<a + id="x1-78003r151"></a> + <h2 class="appendixHead"><span class="titlemark">Appendix A</span><br /><a + id="x1-79000A"></a>Solved Examples</h2> + <h3 class="sectionHead"><span class="titlemark">A.1 </span> <a + id="x1-80000A.1"></a>Solved Examples</h3> +<!--l. 7--><p class="noindent" > + <h4 class="subsectionHead"><span class="titlemark">A.1.1 </span> <a + id="x1-81000A.1.1"></a>Basic RC Circuit</h4> +<!--l. 8--><p class="noindent" > + <h5 class="subsubsectionHead"><a + id="x1-82000A.1.1"></a>Problem Statement-</h5> +<!--l. 8--><p class="noindent" >Plot the Input and Output Waveform of RC ckt where the input voltage (Vs) is +50Hz, 3V peak to peak. Value for Resistor (R) and Capacitor(C) is 1<span +class="cmmi-10x-x-109">k </span>and 1<span +class="cmmi-10x-x-109">uf</span> +respectively. +<!--l. 10--><p class="noindent" > + <h5 class="subsubsectionHead"><a + id="x1-83000A.1.1"></a>Solution-</h5> +<!--l. 11--><p class="noindent" >Draw the schematic and label the nodes as shown in Fig. A.1a using the schematic editor. +Annotate the schematic using the Annotate tool from the top toolbar in Schematic editor. +Perform Electric Rules check using the Perform electric rules check tool from the top toolbar. +Ensure that there are no errors in the circuit schematic. Now generate Spice netlist for +simulation using the Generate Netlist tool from the top toolbar. This is shown +Fig. <a +href="#x1-830011">A.1<!--tex4ht:ref: rc_schematic --></a>. +<!--l. 18--><p class="indent" > Next step is to convert kicad netlist to ngspice netlist by click on icon Convert Kicad to +Ngspice. Then Fill the Analysis tab with Transisent option selected as given in Fig. <a +href="#x1-830022">A.2<!--tex4ht:ref: rc_netlistgeneration --></a>. +Enter start time = 0<span +class="cmmi-10x-x-109">ms</span>, step time = 1<span +class="cmmi-10x-x-109">ms</span>, stop time = 100<span +class="cmmi-10x-x-109">ms</span>. +<!--l. 22--><p class="indent" > Now Click on Sources Details Tab to Enter Sine Source Values as shown in +Fig. <a +href="#x1-830044">A.4<!--tex4ht:ref: rc_sourcedetailstab --></a>. +<!--l. 24--><p class="indent" > Then Press Convert Button which will generate Ngspice Netlist (rc.cir.out) +<!--l. 26--><p class="indent" > Now Click on Simulation icon to open Ngspice Plot and Python Plot shown in Fig. <a +href="#x1-830055">A.5<!--tex4ht:ref: rc_ngspiceplot --></a> +And Fig. <a +href="#x1-830066">A.6<!--tex4ht:ref: rc_pythonplot --></a>. + +<!--l. 28--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-830011"></a> + + +<!--l. 30--><p class="noindent" ><img +src="figures/rc_schematic.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.1: </span><span +class="content">Schematic of RC circuit</span></div><!--tex4ht:label?: x1-830011 --> + +<!--l. 33--><p class="indent" > </div><hr class="endfigure"> +<!--l. 35--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-830022"></a> + + +<!--l. 37--><p class="noindent" ><img +src="figures/rc_netlistgeneration.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.2: </span><span +class="content">RC circuit Netlist Generation</span></div><!--tex4ht:label?: x1-830022 --> + +<!--l. 40--><p class="indent" > </div><hr class="endfigure"> +<!--l. 42--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-830033"></a> + + +<!--l. 44--><p class="noindent" ><img +src="figures/rc_analysistab.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.3: </span><span +class="content">RC Circuit Analysis Insertor</span></div><!--tex4ht:label?: x1-830033 --> + +<!--l. 47--><p class="indent" > </div><hr class="endfigure"> +<!--l. 49--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-830044"></a> + + +<!--l. 51--><p class="noindent" ><img +src="figures/rc_sourcedetailstab.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.4: </span><span +class="content">RC Source Details</span></div><!--tex4ht:label?: x1-830044 --> + +<!--l. 54--><p class="indent" > </div><hr class="endfigure"> +<!--l. 56--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-830055"></a> + + +<!--l. 58--><p class="noindent" ><img +src="figures/rc_ngspiceplot.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.5: </span><span +class="content">Ngspice Plot of RC circuit</span></div><!--tex4ht:label?: x1-830055 --> + +<!--l. 61--><p class="indent" > </div><hr class="endfigure"> +<!--l. 63--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-830066"></a> + + +<!--l. 65--><p class="noindent" ><img +src="figures/rc_pythonplot.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.6: </span><span +class="content">Python Plot of RC Circuit</span></div><!--tex4ht:label?: x1-830066 --> + +<!--l. 68--><p class="indent" > </div><hr class="endfigure"> + <h4 class="subsectionHead"><span class="titlemark">A.1.2 </span> <a + id="x1-84000A.1.2"></a>Half Wave Rectifier</h4> +<!--l. 74--><p class="noindent" > + <h5 class="subsubsectionHead"><a + id="x1-85000A.1.2"></a>Problem Statement-</h5> +<!--l. 74--><p class="noindent" >Plot the Input and Output Waveform of Half Wave Rectifier ckt where the input voltage (Vs) +is 50Hz, 2V peak to peak. Value for Resistor (R) is 1k respectively +<!--l. 76--><p class="noindent" > + <h5 class="subsubsectionHead"><a + id="x1-86000A.1.2"></a>Solution-</h5> +<!--l. 77--><p class="noindent" >Draw the schematic and label the nodes as shown in Fig. <a +href="#x1-860017">A.7<!--tex4ht:ref: hwr_schematic --></a> using the schematic editor. +Annotate the schematic using the Annotate tool from the top toolbar in Schematic editor. +Perform Electric Rules check using the Perform electric rules check tool from the top toolbar. +Ensure that there are no errors in the circuit schematic. Now generate Spice netlist for +simulation using the Generate Netlist tool from the top toolbar. This is shown in +Fig. <a +href="#x1-860028">A.8<!--tex4ht:ref: hwr_netlistgeneration --></a>. +<!--l. 84--><p class="indent" > Next step is to convert kicad netlist to ngspice netlist by click on icon Convert Kicad to +Ngspice. Then Fill the Analysis tab with Transisent option selected as given in Fig. <a +href="#x1-860039">A.9<!--tex4ht:ref: hwr_analysistab --></a>. +Enter start time = 0<span +class="cmmi-10x-x-109">ms</span>, step time = 1<span +class="cmmi-10x-x-109">ms</span>, stop time = 100<span +class="cmmi-10x-x-109">ms</span>. Now Click on Sources Details +Tab to Enter Sine Source Values as shown in Fig. <a +href="#x1-8600410">A.10<!--tex4ht:ref: hwr_sourcedetailstab --></a>. Now Click on Device Model Tab to +ADD Diode model to the circuit shown in Fig. <a +href="#x1-8600511">A.11<!--tex4ht:ref: hwr_devicemodelingtab --></a>. (Note Details about Device Model is +expained in earlier chapter Model Builder.) +<!--l. 91--><p class="indent" > Then Press Convert Button which will generate Ngspice Netlist (Halfwave-Rectifier.cir.out) +<!--l. 93--><p class="indent" > Now Click on Simulation icon to open Ngspice Plot and Python Plot shown in Fig. <a +href="#x1-8600612">A.12<!--tex4ht:ref: hwr_ngspiceplot --></a> +And Fig. <a +href="#x1-8600713">A.13<!--tex4ht:ref: hwr_pythonplot --></a> + +<!--l. 95--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-860017"></a> + + +<!--l. 97--><p class="noindent" ><img +src="figures/hwr_schematic.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.7: </span><span +class="content">Schematic of Halfwave Rectifier circuit</span></div><!--tex4ht:label?: x1-860017 --> + +<!--l. 100--><p class="indent" > </div><hr class="endfigure"> +<!--l. 102--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-860028"></a> + + +<!--l. 104--><p class="noindent" ><img +src="figures/hwr_netlistgeneration.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.8: </span><span +class="content">Halfwave Rectifier circuit Netlist Generation</span></div><!--tex4ht:label?: x1-860028 --> + +<!--l. 107--><p class="indent" > </div><hr class="endfigure"> +<!--l. 109--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-860039"></a> + + +<!--l. 111--><p class="noindent" ><img +src="figures/hwr_analysistab.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.9: </span><span +class="content">Halfwave Rectifier Circuit Analysis Insertor</span></div><!--tex4ht:label?: x1-860039 --> + +<!--l. 114--><p class="indent" > </div><hr class="endfigure"> +<!--l. 116--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-8600410"></a> + + +<!--l. 118--><p class="noindent" ><img +src="figures/hwr_sourcedetailstab.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.10: </span><span +class="content">Halfwave Rectifier Source Details</span></div><!--tex4ht:label?: x1-8600410 --> + +<!--l. 121--><p class="indent" > </div><hr class="endfigure"> +<!--l. 123--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-8600511"></a> + + +<!--l. 125--><p class="noindent" ><img +src="figures/hwr_devicemodelingtab.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.11: </span><span +class="content">Device Modeling of Halfwave Rectifier circuit</span></div><!--tex4ht:label?: x1-8600511 --> + +<!--l. 128--><p class="indent" > </div><hr class="endfigure"> +<!--l. 130--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-8600612"></a> + + +<!--l. 132--><p class="noindent" ><img +src="figures/hwr_ngspiceplot.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.12: </span><span +class="content">Ngspice Plot of Halfwave Rectifier circuit</span></div><!--tex4ht:label?: x1-8600612 --> + +<!--l. 135--><p class="indent" > </div><hr class="endfigure"> +<!--l. 137--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-8600713"></a> + + +<!--l. 139--><p class="noindent" ><img +src="figures/hwr_pythonplot.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.13: </span><span +class="content">Python Plot of Halfwave Rectifier Circuit</span></div><!--tex4ht:label?: x1-8600713 --> + +<!--l. 142--><p class="indent" > </div><hr class="endfigure"> + <h4 class="subsectionHead"><span class="titlemark">A.1.3 </span> <a + id="x1-87000A.1.3"></a>Inverting Amplifier</h4> +<!--l. 147--><p class="noindent" > + <h5 class="subsubsectionHead"><a + id="x1-88000A.1.3"></a>Problem Statement-</h5> +<!--l. 148--><p class="noindent" >Plot the Input and Output Waveform of Inverting Amplifier ckt where the input voltage (Vs) +is 50<span +class="cmmi-10x-x-109">Hz</span>, 2<span +class="cmmi-10x-x-109">V </span>peak to peak and gain is 2. + <h5 class="subsubsectionHead"><a + id="x1-89000A.1.3"></a>Solution-</h5> +<!--l. 150--><p class="noindent" >Draw the schematic and label the nodes as shown in Fig. <a +href="#x1-8900114">A.14<!--tex4ht:ref: ia_schematic --></a>. using the schematic editor. +Annotate the schematic using the Annotate tool from the top toolbar in Schematic editor. +Perform Electric Rules check using the Perform electric rules check tool from the top toolbar. +Ensure that there are no errors in the circuit schematic. Now generate Spice netlist for +simulation using the Generate Netlist tool from the top toolbar. This is shown in +Fig. <a +href="#x1-8900215">A.15<!--tex4ht:ref: ia_netlistgeneration --></a>. +<!--l. 157--><p class="indent" > Next step is to convert kicad netlist to ngspice netlist by click on icon Convert Kicad to +Ngspice. Then Fill the Analysis tab with Transisent option selected as given in +Fig. <a +href="#x1-8900316">A.16<!--tex4ht:ref: ia_analysistab --></a>. Enter start time = 0<span +class="cmmi-10x-x-109">ms</span>, step time = 1<span +class="cmmi-10x-x-109">ms</span>, stop time = 100<span +class="cmmi-10x-x-109">ms</span>. Now +Click on Sources Details Tab to Enter Sine Source Values as shown in Fig. <a +href="#x1-8900417">A.17<!--tex4ht:ref: ia_sourcedetailstab --></a>. +Now Click on Subciruits Tab to ADD UA741 Subcircut to the circuit shown in +Fig. <a +href="#x1-8900518">A.18<!--tex4ht:ref: ia_subcircuitstab --></a> (Note Details about Subcircuit is expained in earlier chapter Subcircuit +Builder.) +<!--l. 164--><p class="indent" > Then Press Convert Button which will generate Ngspice Netlist (Inverting-Amplifier.cir.out) +<!--l. 166--><p class="indent" > Now Click on Simulation icon to open Ngspice Plot and Python Plot shown in Fig. <a +href="#x1-8900720">A.20<!--tex4ht:ref: ia_pythonplot --></a> +and Fig. <a +href="#x1-8900619">A.19<!--tex4ht:ref: ia_ngspiceplot --></a>. + +<!--l. 168--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-8900114"></a> + + +<!--l. 170--><p class="noindent" ><img +src="figures/ia_schematic.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.14: </span><span +class="content">Schematic of Inverting Amplifier circuit</span></div><!--tex4ht:label?: x1-8900114 --> + +<!--l. 173--><p class="indent" > </div><hr class="endfigure"> +<!--l. 175--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-8900215"></a> + + +<!--l. 177--><p class="noindent" ><img +src="figures/ia_netlistgeneration.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.15: </span><span +class="content">Inverting Amplifier circuit Netlist Generation</span></div><!--tex4ht:label?: x1-8900215 --> + +<!--l. 180--><p class="indent" > </div><hr class="endfigure"> +<!--l. 182--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-8900316"></a> + + +<!--l. 184--><p class="noindent" ><img +src="figures/ia_analysistab.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.16: </span><span +class="content">Inverting Amplifier circuit Analysis Tab</span></div><!--tex4ht:label?: x1-8900316 --> + +<!--l. 187--><p class="indent" > </div><hr class="endfigure"> +<!--l. 189--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-8900417"></a> + + +<!--l. 191--><p class="noindent" ><img +src="figures/ia_sourcedetailstab.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.17: </span><span +class="content">Inverting Amplifier Source Details</span></div><!--tex4ht:label?: x1-8900417 --> + +<!--l. 194--><p class="indent" > </div><hr class="endfigure"> +<!--l. 196--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-8900518"></a> + + +<!--l. 198--><p class="noindent" ><img +src="figures/ia_subcircuitstab.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.18: </span><span +class="content">Sub Circuit Tab of Inverting Amplifier</span></div><!--tex4ht:label?: x1-8900518 --> + +<!--l. 201--><p class="indent" > </div><hr class="endfigure"> +<!--l. 203--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-8900619"></a> + + +<!--l. 205--><p class="noindent" ><img +src="figures/ia_ngspiceplot.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.19: </span><span +class="content">Ngspice Plot of Inverting Amplifier circuit</span></div><!--tex4ht:label?: x1-8900619 --> + +<!--l. 208--><p class="indent" > </div><hr class="endfigure"> +<!--l. 210--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-8900720"></a> + + +<!--l. 212--><p class="noindent" ><img +src="figures/ia_pythonplot.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.20: </span><span +class="content">Python Plot of Inverting Amplifier Circuit</span></div><!--tex4ht:label?: x1-8900720 --> + +<!--l. 215--><p class="indent" > </div><hr class="endfigure"> + <h4 class="subsectionHead"><span class="titlemark">A.1.4 </span> <a + id="x1-90000A.1.4"></a>Precision Rectifier</h4> +<!--l. 221--><p class="noindent" > + <h5 class="subsubsectionHead"><a + id="x1-91000A.1.4"></a>Problem Statement-</h5> +<!--l. 222--><p class="noindent" >Plot the Input and Output Waveform of Precision Reectifier ckt where the input voltage (Vs) +is 50Hz, 3V peak to peak. +<!--l. 225--><p class="noindent" > + <h5 class="subsubsectionHead"><a + id="x1-92000A.1.4"></a>Solution -</h5> +<!--l. 227--><p class="noindent" >Draw the schematic and label the nodes as shown in Fig. D.1a using the schematic editor. +Annotate the schematic using the Annotate tool from the top toolbar in Schematic editor. +Perform Electric Rules check using the Perform electric rules check tool from the top toolbar. +Ensure that there are no errors in the circuit schematic. Now generate Spice netlist for +simulation using the Generate Netlist tool from the top toolbar. This is shown in +Fig. <a +href="#x1-9200222">A.22<!--tex4ht:ref: pr_netlistgeneration --></a>. +<!--l. 234--><p class="indent" > Next step is to convert kicad netlist to ngspice netlist by click on icon Convert Kicad to +Ngspice. Then Fill the Analysis tab with Transisent option selected as given in +Fig. <a +href="#x1-9200323">A.23<!--tex4ht:ref: pr_analysistab --></a>. Enter start time = 0ms, step time = 1 ms, stop time = 100 ms. Now Click +on Sources Details Tab to Enter Sine Source Values as shown in Fig. <a +href="#x1-9200424">A.24<!--tex4ht:ref: pr_sourcedetailstab --></a>. Now +Click on Device Model Tab to ADD Diode model to the circuit shown in Fig. <a +href="#x1-9200525">A.25<!--tex4ht:ref: pr_devicemodelingtab --></a>. +(Note Details about Device Model is expained in earlier chapter Model Builder.) +Then Click on Subciruits Tab to ADD UA741 Subcircut to the circuit shown in +Fig. <a +href="#x1-9200626">A.26<!--tex4ht:ref: pr_subcircuitstab --></a>. (Note Details about Subcircuit is expained in earlier chapter Subcircuit +Builder.) +<!--l. 243--><p class="indent" > Then Press Convert Button which will generate Ngspice Netlist (Precision-Rectifier.cir.out) +<!--l. 245--><p class="indent" > Now Click on Simulation icon to open Ngspice Plot and Python Plot shown in Fig. <a +href="#x1-9200727">A.27<!--tex4ht:ref: pr_ngspiceplot --></a> +and Fig. <a +href="#x1-9200828">A.28<!--tex4ht:ref: pr_pythonplot --></a>. + +<!--l. 247--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-9200121"></a> + + +<!--l. 249--><p class="noindent" ><img +src="figures/pr_schematic.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.21: </span><span +class="content">Schematic of Precision Rectifier circuit</span></div><!--tex4ht:label?: x1-9200121 --> + +<!--l. 252--><p class="indent" > </div><hr class="endfigure"> +<!--l. 254--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-9200222"></a> + + +<!--l. 256--><p class="noindent" ><img +src="figures/pr_netlistgeneration.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.22: </span><span +class="content">Precision Rectifier circuit Netlist Generation</span></div><!--tex4ht:label?: x1-9200222 --> + +<!--l. 259--><p class="indent" > </div><hr class="endfigure"> +<!--l. 261--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-9200323"></a> + + +<!--l. 263--><p class="noindent" ><img +src="figures/pr_analysistab.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.23: </span><span +class="content">Precision Rectifier Circuit Analysis Insertor</span></div><!--tex4ht:label?: x1-9200323 --> + +<!--l. 266--><p class="indent" > </div><hr class="endfigure"> +<!--l. 268--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-9200424"></a> + + +<!--l. 270--><p class="noindent" ><img +src="figures/pr_sourcedetailstab.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.24: </span><span +class="content">Precision Rectifier Source Details</span></div><!--tex4ht:label?: x1-9200424 --> + +<!--l. 273--><p class="indent" > </div><hr class="endfigure"> +<!--l. 275--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-9200525"></a> + + +<!--l. 277--><p class="noindent" ><img +src="figures/pr_devicemodelingtab.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.25: </span><span +class="content">Device Modelling of Precision Rectifier circuit</span></div><!--tex4ht:label?: x1-9200525 --> + +<!--l. 280--><p class="indent" > </div><hr class="endfigure"> +<!--l. 282--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-9200626"></a> + + +<!--l. 284--><p class="noindent" ><img +src="figures/pr_subcircuitstab.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.26: </span><span +class="content">Precision Rectifier Sub-circuit</span></div><!--tex4ht:label?: x1-9200626 --> + +<!--l. 287--><p class="indent" > </div><hr class="endfigure"> +<!--l. 289--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-9200727"></a> + + +<!--l. 291--><p class="noindent" ><img +src="figures/pr_ngspiceplot.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.27: </span><span +class="content">Ngspice Plot of Precision Rectifier circuit</span></div><!--tex4ht:label?: x1-9200727 --> + +<!--l. 294--><p class="indent" > </div><hr class="endfigure"> +<!--l. 296--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-9200828"></a> + + +<!--l. 298--><p class="noindent" ><img +src="figures/pr_pythonplot.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.28: </span><span +class="content">Python Plot of Precision Rectifier Circuit</span></div><!--tex4ht:label?: x1-9200828 --> + +<!--l. 301--><p class="indent" > </div><hr class="endfigure"> + <h4 class="subsectionHead"><span class="titlemark">A.1.5 </span> <a + id="x1-93000A.1.5"></a>Half Adder Example</h4> +<!--l. 307--><p class="noindent" > + <h5 class="subsubsectionHead"><a + id="x1-94000A.1.5"></a>Problem Statement-</h5> +<!--l. 307--><p class="noindent" >Plot the Input and Output Waveform of Half Adder ckt. +<!--l. 309--><p class="noindent" > + <h5 class="subsubsectionHead"><a + id="x1-95000A.1.5"></a>Solution -</h5> +<!--l. 311--><p class="noindent" >Draw the schematic and label the nodes as shown in Fig. <a +href="#x1-9500129">A.29<!--tex4ht:ref: ha_schematic --></a> using the schematic editor. +[Note : To create any Digital Circuits ADCs and DACs must be connected to input and +output of the circuit.] Annotate the schematic using the Annotate tool from the top toolbar in +Schematic editor. Perform Electric Rules check using the Perform electric rules check tool +from the top toolbar. Ensure that there are no errors in the circuit schematic. Now generate +Spice netlist for simulation using the Generate Netlist tool from the top toolbar. This is +shown in Fig. <a +href="#x1-9500230">A.30<!--tex4ht:ref: ha_netlistgeneration --></a>. +<!--l. 319--><p class="indent" > Next step is to convert kicad netlist to ngspice netlist by click on icon Convert Kicad to +Ngspice. Then Fill the Analysis tab with Transisent option selected as given in Fig. <a +href="#x1-9500331">A.31<!--tex4ht:ref: ha_analysistab --></a>. +Enter start time = 0<span +class="cmmi-10x-x-109">ms</span>, step time = 1<span +class="cmmi-10x-x-109">ms</span>, stop time = 100<span +class="cmmi-10x-x-109">ms</span>. Now Click on Sources Details +Tab to Enter Sine Source Values as shown in Fig. <a +href="#x1-9500432">A.32<!--tex4ht:ref: ha_sourcedetailstab --></a>. Click on Ngspice Model Tab and +Enter the Details of Ngspice Models else keep it empty where it will select default values as +shown in Fig. <a +href="#x1-9500533">A.33<!--tex4ht:ref: ha_ngspicemodeltab --></a> Then Click on Subciruits Tab to ADD half-adder Subcircut to the circuit +shown in Fig. <a +href="#x1-9500634">A.34<!--tex4ht:ref: ha_subcircuitstab --></a>. (Note Details about Subcircuit is expained in earlier chapter Subcircuit +Builder.) +<!--l. 327--><p class="indent" > Then Press Convert Button which will generate Ngspice Netlist (Half-Adder.cir.out) +<!--l. 329--><p class="indent" > Now Click on Simulation icon to open Ngspice Plot and Python Plot shown in Fig. <a +href="#x1-9500735">A.35<!--tex4ht:ref: ha_ngspiceplot --></a> +and Fig. <a +href="#x1-9500836">A.36<!--tex4ht:ref: ha_pythonplot --></a>. + +<!--l. 331--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-9500129"></a> + + +<!--l. 333--><p class="noindent" ><img +src="figures/ha_schematic.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.29: </span><span +class="content">Schematic of Half Adder circuit</span></div><!--tex4ht:label?: x1-9500129 --> + +<!--l. 336--><p class="indent" > </div><hr class="endfigure"> +<!--l. 338--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-9500230"></a> + + +<!--l. 340--><p class="noindent" ><img +src="figures/ha_netlistgeneration.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.30: </span><span +class="content">Half Adder circuit Netlist Generation</span></div><!--tex4ht:label?: x1-9500230 --> + +<!--l. 343--><p class="indent" > </div><hr class="endfigure"> +<!--l. 345--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-9500331"></a> + + +<!--l. 347--><p class="noindent" ><img +src="figures/ha_analysistab.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.31: </span><span +class="content">Half Adder Circuit Analysis Insertor</span></div><!--tex4ht:label?: x1-9500331 --> + +<!--l. 350--><p class="indent" > </div><hr class="endfigure"> +<!--l. 352--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-9500432"></a> + + +<!--l. 354--><p class="noindent" ><img +src="figures/ha_sourcedetailstab.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.32: </span><span +class="content">Half Adder Source Details</span></div><!--tex4ht:label?: x1-9500432 --> + +<!--l. 357--><p class="indent" > </div><hr class="endfigure"> +<!--l. 359--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-9500533"></a> + + +<!--l. 361--><p class="noindent" ><img +src="figures/ha_ngspicemodeltab.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.33: </span><span +class="content">Ngspice Plot of Half Adder circuit</span></div><!--tex4ht:label?: x1-9500533 --> + +<!--l. 364--><p class="indent" > </div><hr class="endfigure"> +<!--l. 366--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-9500634"></a> + + +<!--l. 368--><p class="noindent" ><img +src="figures/ha_subcircuitstab.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.34: </span><span +class="content">Ngspice Plot of Half Adder circuit</span></div><!--tex4ht:label?: x1-9500634 --> + +<!--l. 371--><p class="indent" > </div><hr class="endfigure"> +<!--l. 373--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-9500735"></a> + + +<!--l. 375--><p class="noindent" ><img +src="figures/ha_ngspiceplot.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.35: </span><span +class="content">Ngspice Plot of Half Adder circuit</span></div><!--tex4ht:label?: x1-9500735 --> + +<!--l. 378--><p class="indent" > </div><hr class="endfigure"> +<!--l. 380--><p class="indent" > <hr class="figure"><div class="figure" +> + +<a + id="x1-9500836"></a> + + +<!--l. 382--><p class="noindent" ><img +src="figures/ha_pythonplot.png" alt="PIC" +> +<br /> <div class="caption" +><span class="id">Figure A.36: </span><span +class="content">Python Plot of Half Adder Circuit</span></div><!--tex4ht:label?: x1-9500836 --> + +<!--l. 385--><p class="indent" > </div><hr class="endfigure"> + +</body></html> + + + diff --git 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It is an integrated tool built using open source software such as KiCad (<a href=http://www.kicad-pcb.org>http://www.kicad-pcb.org</a>) and Ngspice(<a href=http://ngspice.sourceforge.net>http://ngspice.sourceforge.net</a>). <br/> diff --git a/src/frontEnd/Application.py b/src/frontEnd/Application.py index e977df23..2aa7c649 100755 --- a/src/frontEnd/Application.py +++ b/src/frontEnd/Application.py @@ -224,7 +224,7 @@ class Application(QtGui.QMainWindow): print "Help is called" self.obj_appconfig.print_info('Help is called') print "Current Project : ",self.obj_appconfig.current_project - self.obj_Mainview.obj_dockarea.createTestEditor() + self.obj_Mainview.obj_dockarea.usermanual() def open_modelEditor(self): diff --git a/src/frontEnd/DockArea.py b/src/frontEnd/DockArea.py index 1c155787..65296525 100644 --- a/src/frontEnd/DockArea.py +++ b/src/frontEnd/DockArea.py @@ -6,6 +6,7 @@ from modelEditor.ModelEditor import ModelEditorclass from subcircuit.Subcircuit import Subcircuit from kicadtoNgspice.KicadtoNgspice import MainWindow from browser.Welcome import Welcome +from browser.UserManual import UserManual import os dockList = ['Welcome'] @@ -238,4 +239,31 @@ class DockArea(QtGui.QMainWindow): dock['Subcircuit-'+str(count)].setFocus() dock['Subcircuit-'+str(count)].raise_() + count = count + 1 + + def usermanual(self): + """ + This function creates a widget for different subcircuit options + """ + + global count + self.usermanualWidget=QtGui.QWidget() + self.usermanualLayout=QtGui.QVBoxLayout() + self.usermanualLayout.addWidget(UserManual()) + + self.usermanualWidget.setLayout(self.usermanualLayout) + dock['User Manual-'+str(count)] = QtGui.QDockWidget('User Manual-'+str(count)) + dock['User Manual-'+str(count)].setWidget(self.usermanualWidget) + self.addDockWidget(QtCore.Qt.TopDockWidgetArea, dock['User Manual-'+str(count)]) + self.tabifyDockWidget(dock['Welcome'],dock['User Manual-'+str(count)]) + + #CSS + dock['User Manual-'+str(count)].setStyleSheet(" \ + .QWidget { border-radius: 15px; border: 1px solid gray; padding: 5px; width: 200px; height: 150px; } \ + ") + + dock['User Manual-'+str(count)].setVisible(True) + dock['User Manual-'+str(count)].setFocus() + dock['User Manual-'+str(count)].raise_() + count = count + 1
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