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diff --git a/Electronic_Devices_and_Circuits_by_D._C._Kulshreshtha/Chapter10.ipynb b/Electronic_Devices_and_Circuits_by_D._C._Kulshreshtha/Chapter10.ipynb new file mode 100755 index 00000000..4e6b0eab --- /dev/null +++ b/Electronic_Devices_and_Circuits_by_D._C._Kulshreshtha/Chapter10.ipynb @@ -0,0 +1,379 @@ +{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:efde35bc6b39332bcbdd0902e3c4730008212f1e0c635f78b359c0a32b2006c0"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter10:Feedback in Amplifiers"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example E1 - Pg 368"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Determine the gain of feedback amplifier\n",
+ "#given\n",
+ "A=100.;#internal gain\n",
+ "B=0.1;#feedback factor\n",
+ "Af=A/(1.+A*B);\n",
+ "print '%s %.2f %s' %(\"The gain of feedback amplifier =\",Af,\"\\n\");\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The gain of feedback amplifier = 9.09 \n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example E2 - Pg 368"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Determine the gain of feedback amplifier in dB\n",
+ "#given\n",
+ "import math\n",
+ "Ad=60.;#dB #internal gain in dB\n",
+ "A=10.**(Ad/20.); #internal gain\n",
+ "B=1./20.;#feedback factor\n",
+ "Af=A/(1.+A*B);\n",
+ "Afd=20.*math.log10(Af);\n",
+ "print '%s %.2f %s' %(\"The gain of feedback amplifier =\",Afd,\"dB\");\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The gain of feedback amplifier = 25.85 dB\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example E3 - Pg 368"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate the percentage of output fed back to input\n",
+ "#given\n",
+ "A=600.;#internal gain\n",
+ "Af=50.;#gain of feedback amplifier\n",
+ "B=(A/Af-1.)/A;\n",
+ "print '%s %.3f %s' %(\"The percentage of output fed back to input =\",B*100,\"percent\");\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The percentage of output fed back to input = 1.833 percent\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example E4 - Pg 368"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate the internal gain and percentage of output fed back to input\n",
+ "#given\n",
+ "Af=80.;#gain of feedback amplifier\n",
+ "Vi=0.05;#V#input with feedback\n",
+ "Vi_=4.*10.**-3.;#V#input without feedback\n",
+ "Vo_=Af*Vi;\n",
+ "A=Vo_/Vi_;\n",
+ "print '%s %.f %s' %(\"The internal gain is =\",A,\"\\n\");\n",
+ "B=(A/Af-1.)/A;\n",
+ "print '%s %.2f %s' %(\"The percentage of output fed back to input =\",B*100,\"percent\\n\");\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The internal gain is = 1000 \n",
+ "\n",
+ "The percentage of output fed back to input = 1.15 percent\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 4
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example E5 - Pg 369"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate the gain with and without feedback and feedback factor\n",
+ "#given\n",
+ "Vo_=5.;#V #output voltage\n",
+ "Vi=0.2;#V #input with feedback\n",
+ "Vi_=0.05;#V #input without feedback\n",
+ "A=Vo_/Vi_;\n",
+ "Af=Vo_/Vi;\n",
+ "print '%s %.f %s' %(\"The gain without feedback is =\",A,\"\\n\");\n",
+ "print '%s %.f %s' %(\"The gain with feedback is =\",Af,\"\\n\");\n",
+ "B=(A/Af-1.)/A;\n",
+ "print '%s %.f %s' %(\"The feedback factor =\",B*100,\"percent\\n\");\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The gain without feedback is = 100 \n",
+ "\n",
+ "The gain with feedback is = 25 \n",
+ "\n",
+ "The feedback factor = 3 percent\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 5
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example E6 - Pg 369"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate the gain of feedback amplifier and feedback factor\n",
+ "#given\n",
+ "A=100.; #internal gain\n",
+ "N=20.;#dB #negative feedback\n",
+ "B=(10.**(-N/(-20.))-1.)/A; #taking antilog\n",
+ "Af=A/(1.+A*B);\n",
+ "print '%s %.f %s' %(\"The feedback factor =\",B*100,\"percent\\n\");\n",
+ "print '%s %.f %s' %(\"The gain of the feedback amplifier is =\",Af,\"\\n\");\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The feedback factor = 9 percent\n",
+ "\n",
+ "The gain of the feedback amplifier is = 10 \n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 6
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example E7 - Pg 371"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate percentage change in the overall gain\n",
+ "#given\n",
+ "A=1000.;#internal gain\n",
+ "N=40.;#dB#negative feedback\n",
+ "D=10.**((-N)/-20.);#D=(1+AB)desensitivity\n",
+ "dA_A=10.;#percent#dA/A\n",
+ "dAf_Af=dA_A/D;#dAf/Af\n",
+ "print '%s %.1f %s' %(\"The percentage change in the overall gain =\",dAf_Af,\"percent\");\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The percentage change in the overall gain = 0.1 percent\n"
+ ]
+ }
+ ],
+ "prompt_number": 7
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example E8 - Pg 371"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate percentage change in the overall gain\n",
+ "#given\n",
+ "Adb=60.;#dB#internal gain in dB\n",
+ "B=0.005;#feedback factor\n",
+ "A=10.**(Adb/(20.));#taking antilog\n",
+ "dA_A=-12.;#percent #dA/A\n",
+ "D=(1.+A*B);#D=(1+AB)desensitivity\n",
+ "dAf_Af=dA_A/D;#dAf/Af\n",
+ "print '%s %.f %s' %(\"The percentage change in the overall gain reduces by =\",-dAf_Af,\"percent\");\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The percentage change in the overall gain reduces by = 2 percent\n"
+ ]
+ }
+ ],
+ "prompt_number": 8
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example E9 - Pg 374"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Determine the input resistance of feedback amplifier\n",
+ "#given\n",
+ "A=250.;#internal gain\n",
+ "B=0.1;#feedback factor\n",
+ "Ri=1.1*10.**3.;#ohm #input resistance\n",
+ "Rif=Ri*(1.+A*B);\n",
+ "print '%s %.1f %s' %(\"The input resistance of feedback amplifier =\",Rif/1000,\"kohm\");\n",
+ "\n",
+ "#The ans in book is incorrect due to use of (2+A*B) instead of (1+A*B) the ans in book is 29.7 kohm\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The input resistance of feedback amplifier = 28.6 kohm\n"
+ ]
+ }
+ ],
+ "prompt_number": 9
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example E10 - Pg 374"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate the percentage of negative feedback to input\n",
+ "#given\n",
+ "Adb=60.;#dB #internal gain in dB\n",
+ "A=10.**(Adb/(20.)); #taking antilog\n",
+ "Ro=12.*10.**3.;#ohm #output resistance\n",
+ "Rof=600.;#ohm\n",
+ "B=(Ro/Rof-1.)/A;\n",
+ "print '%s %.1f %s' %(\"The percentage of negative feedback to input =\",B*100,\"percent\");\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The percentage of negative feedback to input = 1.9 percent\n"
+ ]
+ }
+ ],
+ "prompt_number": 10
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
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