{ "metadata": { "name": "", "signature": "sha256:f64bf7a670dc36e359e5aa56e0bfa29f09c70f7a0babc95be4c64434f164d9d6" }, "nbformat": 3, "nbformat_minor": 0, "worksheets": [ { "cells": [ { "cell_type": "heading", "level": 1, "metadata": {}, "source": [ "Chapter10 - Comparators" ] }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Ex 10.1 - page : 334" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from __future__ import division\n", "from math import pi, sin\n", "t=range(0,5) #sec(Assumed)\n", "Vin=5*sin(2*pi*t[0]) #V\n", "VCC=15 #V\n", "R2=1 #kohm\n", "R1=6.8 #kohm\n", "VEE=-15 #V\n", "Vsat=13 #V\n", "Vref=R2*VCC/(R1+R2) #V\n", "print \"Reference Voltage = %0.2f V \" %Vref\n", "print \"If Vin>Vref , Vout = %0.2f V \" %Vsat \n", "print \"If Vin<Vref , Vout = %0.2f V \" %-Vsat" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Reference Voltage = 1.92 V \n", "If Vin>Vref , Vout = 13.00 V \n", "If Vin<Vref , Vout = -13.00 V \n" ] } ], "prompt_number": 4 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Ex 10.2 - page 340" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from __future__ import division\n", "Vsat=7 #V\n", "R1=68 #kohm\n", "R2=82 #kohm\n", "VUTP=R2*Vsat/(R1+R2) #V\n", "VLTP=R2*-Vsat/(R1+R2) #V\n", "print \"Upper trip point = %0.2f V \" %VUTP \n", "print \"Lower trip point = %0.2f V \" %VLTP" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Upper trip point = 3.83 V \n", "Lower trip point = -3.83 V \n" ] } ], "prompt_number": 5 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Ex 10.3 - page : 340" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from __future__ import division\n", "from numpy import arcsin, pi\n", "#Vin=5*sin(omega*t)\n", "Vm=5 #V\n", "Vsat=7 #V\n", "R1=68 #kohm\n", "R2=82 #kohm\n", "VUTP=R2*Vsat/(R1+R2) #V\n", "fi=arcsin(VUTP/Vm)*180/pi #degree\n", "print \"Phase shift = %0.2f degree \" %fi \n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Phase shift = 49.94 degree \n" ] } ], "prompt_number": 14 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Ex 10.4 - page : 344" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from __future__ import division\n", "VZ1=4.7 #V\n", "VZ2=4.7 #V\n", "R1=68 #kohm\n", "R2=15 #kohm\n", "Vout=VZ1+0.7 #V(As one zener diode is always forward biased)\n", "VR1=Vout #V\n", "IR1=VR1/R1*1000 #micro A\n", "IR2=IR1 #micro A\n", "VR2=IR2*10**-3*R2 #V\n", "Vout=VR1+VR2 #V\n", "VUTP=(R2/(R1+R2))*Vout #V\n", "VLTP=(R2/(R1+R2))*(-Vout) #V\n", "print \"VUTP = %0.2f V \" %VUTP \n", "print \"VLTP = %0.2f V \" %VLTP" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "VUTP = 1.19 V \n", "VLTP = -1.19 V \n" ] } ], "prompt_number": 15 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Ex 10.5 - page : 346" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from __future__ import division\n", "Vsat=12.5 #V\n", "Vref=-12.5 #V\n", "R1=80 #kohm\n", "R2=20 #kohm\n", "Beta=R2/(R1+R2) #unitless\n", "UTP=Beta*Vsat+(1-Beta)*Vref #V\n", "LTP=-Beta*Vsat+(1-Beta)*Vref #V\n", "VH=UTP-LTP #V\n", "R3=R1*R2/(R1+R2) #kohm\n", "print \"UTP = %0.2f V \" %UTP \n", "print \"LTP = %0.2f V \" %LTP \n", "print \"Hysteresis Voltage, VH = %0.2f V \" %VH \n", "print \"Use R3 = %0.2f kohm \" %R3 " ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "UTP = -7.50 V \n", "LTP = -12.50 V \n", "Hysteresis Voltage, VH = 5.00 V \n", "Use R3 = 16.00 kohm \n" ] } ], "prompt_number": 16 } ], "metadata": {} } ] }