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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 7: Optical Receivers "
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.1: PWD_of_optical_receiver.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Chapter 7\n",
+"//page no 203\n",
+"//given\n",
+"clc;\n",
+"clear all;\n",
+"Trec=54;          //in ns\n",
+"Ttrans=40;          //in ns\n",
+"Pwd=(Trec-Ttrans)/Ttrans*100;\n",
+"printf('\n PWD= %0.0f percent',Pwd) "
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.2: Value_of_Radj.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Chapter 7\n",
+"//page no 214\n",
+"//given\n",
+"clc;\n",
+"clear all;\n",
+"//Vc=Vdin-Vdinq\n",
+"Vc=5;           //in mV  Vdin-Vdinq=Vc\n",
+"Irset =1.8*10^-3*(Vc*10^-3);     //in A\n",
+"printf('\n Irset %0.0f microA',Irset*10^6) ;\n",
+"Vs=1.5;              //Voltage at signal level below Vcc in V\n",
+"Radj=Vs/Irset;                 //in Ohm\n",
+"printf('\n Radj %0.0f kohm',Radj*10^-3) ;\n",
+""
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.3: Reference_voltage_and_reference_resistor.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Chapter 7\n",
+"//page no 223\n",
+"//given\n",
+"clc;\n",
+"clear all;\n",
+"\n",
+"Rl=50;      //in Ohm\n",
+"Ro=100;     //in Ohm\n",
+"Vos=450;            //in mV\n",
+"Vref=(Rl+Ro)/Rl*Vos/2;\n",
+"printf('\n Vref= %0.0f mV',Vref) ;\n",
+"Vee=3.3;            //in V\n",
+"R1=500;         //in Ohm\n",
+"R2=16000;            //in Ohm\n",
+"//Rref=(Vee/Vref/10^3-1)*R1/[1-{R1/R2*(Vee/Vref/10^3-1)}]\n",
+"Rref={(Vee/Vref/10^-3-1)*R1}/[1-R1/R2*(Vee/Vref/10^-3-1)]\n",
+"printf('\n Rref= %0.0f kohm',Rref) ;\n",
+"printf('\n Approx. Rref= %0.1f kohm',Rref*10^-3) ;\n",
+""
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}