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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:1cb6068538d8c97f156cb67d11e52aad1d6c0b391f69a34791cef94fb6857610"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter1 - Constant current sources"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex 1.1 - page 4"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "Iout=8 #micro A\n",
+      "VBE=0.7 #V\n",
+      "Beta=80 #unitless\n",
+      "VCC=20 #V\n",
+      "IREF=Iout*(1+2/Beta) #micro A\n",
+      "R=(VCC-VBE)/IREF #Mohm\n",
+      "print \"Reference current is %0.2f uA\" %IREF\n",
+      "print \"Resistance required is %0.2f Mohm\" %R"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Reference current is 8.20 uA\n",
+        "Resistance required is 2.35 Mohm\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex 1.2 - page 5"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "Iout=1 #mA\n",
+      "VBE=0.7 #V\n",
+      "Beta=100 #unitless\n",
+      "VCC=30 #V\n",
+      "IREF=Iout*(1+2/Beta) #mA\n",
+      "R=(VCC-VBE)/IREF #kohm\n",
+      "print \"Reference current is %0.2f mA\" %IREF \n",
+      "print \"Resistance required is %0.1f kohm\" %R"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Reference current is 1.02 mA\n",
+        "Resistance required is 28.7 kohm\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex 1.3 - page 5"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "Iout=0.5 #mA\n",
+      "Beta=50 #unitless\n",
+      "VEB=0.7 #V\n",
+      "VCC=5 #V\n",
+      "IREF=Iout*(1+2/Beta) #mA\n",
+      "R=(VCC-VEB)/IREF #kohm\n",
+      "print \"Reference current is %0.2f mA\" %IREF \n",
+      "print \"Resistance required is %0.2f kohm\" %R"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Reference current is 0.52 mA\n",
+        "Resistance required is 8.27 kohm\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex 1.4 - page 8"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "Iout=8 #micro A\n",
+      "Beta=100 #unitless\n",
+      "VBE=0.7 #V\n",
+      "VCC=20 #V\n",
+      "IREF=Iout/(1+2/Beta/(1+Beta)) #micro A\n",
+      "R=(VCC-2*VBE)/IREF #Mohm\n",
+      "print \"Reference current is %0.2f micro A\" %IREF \n",
+      "print \"Resistance required is %0.2f Mohm\" %R"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Reference current is 8.00 micro A\n",
+        "Resistance required is 2.33 Mohm\n"
+       ]
+      }
+     ],
+     "prompt_number": 9
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex 1.5 - page 8"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "Iout=60 #micro A\n",
+      "VBE=0.7 #V\n",
+      "Beta=150 #unitless\n",
+      "VCC=30 #V\n",
+      "IREF=Iout*(1+2/Beta/(1+Beta)) #micro A\n",
+      "R=(VCC-2*VBE)/IREF #Mohm\n",
+      "R*=10**3  #kohm\n",
+      "print \"Reference current is %0.3f mA\" %IREF \n",
+      "print \"Resistance required is %0.1f kohm\" %R"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Reference current is 60.005 mA\n",
+        "Resistance required is 476.6 kohm\n"
+       ]
+      }
+     ],
+     "prompt_number": 12
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex 1.6 - page 9"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "VBE=0.7 #V\n",
+      "Beta=120 #unitless\n",
+      "VCC=10 #V\n",
+      "R=5.6 #kohm\n",
+      "#KCL at node x : IREF=IC1+I1 #as Beta>>1\n",
+      "#KCL at node y : I1=IC2+IB3 #as Beta>>1\n",
+      "IREF=(VCC-VBE)/R #mA\n",
+      "#as IREF=2*IC+IB3=IC*(2+1/Beta)=2*IC #as Beta>>1\n",
+      "IC=IREF/2 #mA\n",
+      "Iout=IC #mA\n",
+      "print \"Output current is %0.2f mA\" %Iout"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Output current is 0.83 mA\n"
+       ]
+      }
+     ],
+     "prompt_number": 14
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex 1.7 - page 13"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "import math\n",
+      "Iout=6 #micro A\n",
+      "IREF=1.2 #mA\n",
+      "VBE2=0.7 #V\n",
+      "VT=26 #mV\n",
+      "Beta=120 #unitless\n",
+      "VCC=20 #V\n",
+      "R=(VCC-VBE2)/IREF #kohm\n",
+      "print \"Value of resistance R is %0.f kohm \" %R\n",
+      "IC1=Iout #micro A\n",
+      "IC2=(IREF-IC1*10**-3/Beta)/(1+1/Beta) #mA\n",
+      "RS=1/(IC1*10**-6)*VT*10**-3*math.log(IC2*1000/IC1) #ohm\n",
+      "RS/=10**3 #kohm\n",
+      "print \"Value of resistance RS is %0.1f kohm\" %RS"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Value of resistance R is 16 kohm \n",
+        "Value of resistance RS is 22.9 kohm\n"
+       ]
+      }
+     ],
+     "prompt_number": 17
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex 1.8 - page 14"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "IREF=1 #mA\n",
+      "Io2=20 #micro A\n",
+      "Io3=40 #micro A\n",
+      "VBE1=0.7 #V\n",
+      "VT=26 #mV\n",
+      "VCC=10 #V\n",
+      "VEE=-10 #V\n",
+      "R=(VCC-VBE1-VEE)/IREF #kohm\n",
+      "print \"Value of resistance R is %0.2f kohm \" %R \n",
+      "RE2=VT/Io2*math.log(IREF*1000/Io2) #kohm\n",
+      "print \"Value of resistance RE2 is %0.2f kohm\" %RE2 \n",
+      "RE3=VT/Io3*math.log(IREF*1000/Io3) #kohm\n",
+      "print \"Value of resistance RE3 is %0.2f kohm \" %RE3 \n",
+      "VBE2=VBE1-RE2*Io2/1000 #V\n",
+      "print \"Value of Base emitter voltage of transistor Q2 is %0.4f V\" %VBE2 \n",
+      "VBE3=VBE1-RE3*Io3/1000 #V\n",
+      "print \"Value of Base emitter voltage of transistor Q3 is %0.4f V\" %VBE3"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Value of resistance R is 19.30 kohm \n",
+        "Value of resistance RE2 is 5.09 kohm\n",
+        "Value of resistance RE3 is 2.09 kohm \n",
+        "Value of Base emitter voltage of transistor Q2 is 0.5983 V\n",
+        "Value of Base emitter voltage of transistor Q3 is 0.6163 V\n"
+       ]
+      }
+     ],
+     "prompt_number": 21
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex 1.9 - page 18"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "Beta=100 #unitless\n",
+      "VBE=0.715 #V\n",
+      "R=5.6 #kohm\n",
+      "RC=1 #kohm\n",
+      "VCC=10 #V\n",
+      "VCB1=0 #V(Q1 will act as diode)\n",
+      "IREF=(VCC-VBE)/R #mA\n",
+      "#KCL at node x : IREF=IC1+2*IB \n",
+      "#KCL at node y : I1=IC2+IB3 #as Beta>>1\n",
+      "IREF=(VCC-VBE)/R #mA\n",
+      "#as IREF=2*IC1/Beta+IC1\n",
+      "IC1=IREF/(1+2/Beta) #mA\n",
+      "IC2=IC1 #mA\n",
+      "IC3=IC1 #mA\n",
+      "print \"Collector current in each transistor, IC1=IC2=IC3 is %0.2f mA\" %IC1\n",
+      "IRC=IC1+IC2+IC3 #mA\n",
+      "print \"Current through RC is %0.2f mA\" %IRC\n",
+      "#Answer wrong in the textbook."
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Collector current in each transistor, IC1=IC2=IC3 is 1.63 mA\n",
+        "Current through RC is 4.88 mA\n"
+       ]
+      }
+     ],
+     "prompt_number": 23
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex 1.10 - page 19"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "Vout=5 #V\n",
+      "Beta=180 #unitless\n",
+      "R=22 #kohm\n",
+      "VCC=10 #V\n",
+      "VBE=0.7 #V\n",
+      "IREF=(VCC-VBE)/R #mA\n",
+      "IC=(IREF-VBE/R)/(1+2/Beta) #mA\n",
+      "RC=(VCC-Vout)/IC #kohm\n",
+      "print \"IC1 & IC2 are %0.2f mA\" %IC\n",
+      "print \"RC is %0.2f kohm\" %RC\n",
+      "#Answer in the book is wrong."
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "IC1 & IC2 are 0.39 mA\n",
+        "RC is 12.93 kohm\n"
+       ]
+      }
+     ],
+     "prompt_number": 25
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file