{ "metadata": { "name": "", "signature": "sha256:841a88d7e9e844c5ea929c5620ee175fbc10b920d638293263fe8c73afe043c7" }, "nbformat": 3, "nbformat_minor": 0, "worksheets": [ { "cells": [ { "cell_type": "heading", "level": 1, "metadata": {}, "source": [ "Chapter7: Integrated Circuit Timer And Phase Locked Loops (PLL) " ] }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Ex7.1:pg-339" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Ex 7.1\n", "RA=6.8 #kohm\n", "RB=3.3 #kohm\n", "C=0.1 #micro F\n", "VCC=5 #V\n", "t_high=0.695*(RA+RB)*C #ms\n", "print round(t_high,1),\" =(a) t_high(ms) \" \n", "t_low=0.695*RB*C #ms\n", "print round(t_low,2),\" =(b) t_low(ms) \" \n", "f=1.44/(RA+2*RB)/(C) #kHz\n", "print round(f,2),\" =(c) Frequency of oscillation(kHz) \" \n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "0.7 =(a) t_high(ms) \n", "0.23 =(b) t_low(ms) \n", "1.07 =(c) Frequency of oscillation(kHz) \n" ] } ], "prompt_number": 20 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Ex7.2:pg-339" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Ex 7.2\n", "RA=10 #kohm\n", "C=0.1 #micro F\n", "t=1.1*RA*C #ms\n", "print t,\"= Timing interval(ms) \" \n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "1.1 = Timing interval(ms) \n" ] } ], "prompt_number": 21 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Ex7.3:pg-352" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Ex 7.3 \n", "fc=500 #kHz(Free running frequuency)\n", "fi=600 #kHz(Input signal frequuency)\n", "BW=10 #kHz\n", "out1=fi+fc #kHz(Phase detector output)\n", "out2=fi-fc #kHz(Phase detector output)\n", "print out2,out1,\"= Output of phase detector will be(kHz) \" \n", "print \"Both components are not lying in the passband(i.e. 10 kHz). Hence loop will not acquire lock. \" \n", " #fi+fc is calculated wrong in the book.\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "100 1100 = Output of phase detector will be(kHz) \n", "Both components are not lying in the passband(i.e. 10 kHz). Hence loop will not acquire lock. \n" ] } ], "prompt_number": 7 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Ex7.4:pg-352" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Ex 7.4\n", "import math \n", "fo=10.0 #kHz\n", "V=12.0 #V\n", "fL=round(8*fo/(V-(-V)),2) #kHz(both +ve & -ve value)\n", "C=10 #micro F(Assumed)\n", "fC=round(math.sqrt(fL*10**3/(2*math.pi*3.6*10**3*C*10**-6)),2) #Fz(both +ve & -ve value)\n", "print fC,fL,\"= Frequency fL & fC in kHz \" \n", "LR=2*fL #kHz(Lock Range)\n", "print round(LR,1),\"= Lock Range(kHz) \" \n", "CR=2*fC #kHz(Capture rage)\n", "print round(CR,1),\"= Capture Range(Hz) \" \n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "121.33 3.33 = Frequency fL & fC in kHz \n", "6.7 = Lock Range(kHz) \n", "242.7 = Capture Range(Hz) \n" ] } ], "prompt_number": 28 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Ex7.5:pg-353" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Ex 7.5\n", "import math\n", " \n", "fo=100.0 #kHz(Free running frequency)\n", "V=6.0 #V(both +ve & -ve value)\n", "C=1 #micro F(Demodulation capacitor)\n", "fL=round(8*fo/(V-(-V)),3) #Hz(both +ve & -ve value)\n", "fC=math.sqrt(fL*1000/(2*math.pi*3.6*10**3*C*10**-6)) #kHzz(both +ve & -ve value)\n", "LR=round(2*fL,2) #kHz(Lock range)\n", "print LR,\"= Lock Range(kHz)\" \n", "CR=round(2*fC/1000,2) #kHz(Capture range)\n", "print CR,\"= Capture Range(kHz) \" \n", "RT=10 #kohm(Assumed)\n", "CT=1.2/(4*RT*1000*fo*10**3) #F\n", "print \"Design values are:\" \n", "print \"Resistance RT can be chooosen as 10 kohm. \" \n", "print CT,\" =Capacitance CT(F) \" \n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "133.33 = Lock Range(kHz)\n", "3.43 = Capture Range(kHz) \n", "Design values are:\n", "Resistance RT can be chooosen as 10 kohm. \n", "3e-10 =Capacitance CT(F) \n" ] } ], "prompt_number": 39 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Ex7.7:pg-355" ] }, { "cell_type": "code", "collapsed": false, "input": [ " #Ex 7.7\n", "import math\n", "C=1 #nF\n", "T=10 #micro seconds(Output pulse duration)\n", "R=round(T*10**-6/(C*10**-9*math.log(3))/1000,1) #kohm\n", "print R,\" =(a) Value of R(kohm) \" \n", "VCC=15 #V\n", "T=20 #micro seconds(Output pulse duration)\n", "VTH=VCC*(1-exp(-T*10**-6/(R*1000*C*10**-9))) #V\n", "print round(VTH,1),\" =(b) Value of VTH(V) \" \n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "9.1 =(a) Value of R(kohm) \n", "13.3 =(b) Value of VTH(V) \n" ] } ], "prompt_number": 41 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Ex7.8:pg-355" ] }, { "cell_type": "code", "collapsed": false, "input": [ " #Ex 7.8\n", "import math\n", "C=680.0 #pF\n", "f=50.0 #kHz(Square wave frequency)\n", "D=75.0/100.0 #duty cycle\n", "T=1/f*1000 #micro seconds\n", "tHIGH=D*T #micro seconds\n", "print tHIGH,\" = Value of tHIGH \"\n", "tLOW=T-tHIGH #micro seconds\n", "print tLOW,\" = Value of tLOW \" \n", "RB=(tLOW*10**-6)/(0.69*C*10**-12) #ohm\n", "RA=(tHIGH*10**-6)/(0.695*C*10**-12)-RB #ohm\n", "print round(RA/1000,1),\" = Value of RA(kohm) \" \n", "print round(RB/1000,2),\" = Value of RB(kohm) \" \n", "# Answer in the book is wrong for RA i.e. 21.2" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "15.0 = Value of tHIGH \n", "5.0 = Value of tLOW \n", "21.1 = Value of RA(kohm) \n", "10.66 = Value of RB(kohm) \n" ] } ], "prompt_number": 62 } ], "metadata": {} } ] }