{ "metadata": { "name": "", "signature": "sha256:cba451428c3d9c574800bbc1429b7e9efcd18af4b82f735faf4ac85b4ea52c65" }, "nbformat": 3, "nbformat_minor": 0, "worksheets": [ { "cells": [ { "cell_type": "heading", "level": 1, "metadata": {}, "source": [ "Chapter02:The 741 IC OP-AMP" ] }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Ex2.1:Pg-80" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Ex 2.1\n", "\n", "# data from fig of Ex2.1\n", "VCC=5.0;#V\n", "IS=10**-14.0;#A\n", "RS=39*1000.0;#ohm\n", "VBE12=0.7;#V(Assumed)\n", "VBE11=0.7;#V(Assumed)\n", "VEE=-5;#V\n", "IREF=(VCC-VBE12-VBE11-VEE)/RS*10**6;#micro A\n", "print \"Estimated input reference current , IREF(micro A)\",round(IREF,2)\n", "VT=25*10**-3;#V(Thermal Voltage)\n", "VBE=VT*log(IREF*10**-6/IS);#V\n", "IREF=(VCC-VBE-VBE-VEE)/RS*10**6;#micro A\n", "print \"More precise value of reference current , IREF(micro A)\",round(IREF,2)\n", "#Replacing Vcc by 15 V in the original design\n", "VCC2=15.0;#V\n", "VEE2=-15.0;#V\n", "IREF=(VCC2-VBE-VBE-VEE2)/RS*10**6;#micro A\n", "VBE=VT*log(IREF*10**-6/IS);#V\n", "R5=(VCC-VBE-VBE-VEE)/(IREF*10**-6);#ohm\n", "R5=round(R5/1000);#kohm\n", "print \"Value of R5(kohm) : \",R5" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Estimated input reference current , IREF(micro A) 220.51\n", "More precise value of reference current , IREF(micro A) 225.88\n", "Value of R5(kohm) : 12.0\n" ] } ], "prompt_number": 4 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Ex2.2:Pg-81" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Ex 2.2\n", "import math\n", "# data from fig of Ex2.2\n", "IC10=20*10**-6;#A\n", "IREF=0.5*10**-3;#A\n", "IS=10**-14;#A\n", "VT=25*10**-3;#V(Thermal Voltage)\n", "R4=VT/IC10*math.log(IREF/IC10);#ohm\n", "print \"For Widlar current source design, the value of R4(kohm) : \",round(R4/1000,2)\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "For Widlar current source design, the value of R4(kohm) : 4.02\n" ] } ], "prompt_number": 5 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Ex2.3:Pg-82" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Ex 2.3\n", "\n", "import math\n", "# given data\n", "Gm1=10.0;#mA/V\n", "Gm1=Gm1/1000;#A/V\n", "Cc=50.0;#pF\n", "Cc=Cc*10**-12;#F\n", "Rt=10**8;#ohm(Shunting resistance with Cc)\n", " # solution\n", "Ao=Gm1*Rt;#unitless\n", "fp=1/(2*math.pi*Rt*Cc);#Hz\n", "ft=Gm1/(2*math.pi*Cc)/10**6;#MHz\n", "print \"Frequency at which gain is maximum, fp in Hz\",round(fp,1)\n", "print \"Unit gain frequency, ft(MHz)\",round(ft,1)\n", "#Bode plot can not be plotted with the given data in the question by using python functions. \n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Frequency at which gain is maximum, fp in Hz 31.8\n", "Unit gain frequency, ft(MHz) 31.8\n" ] } ], "prompt_number": 7 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Ex2.4:Pg-83" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Ex 2.4\n", "\n", "import math\n", "# given data\n", "SR=10.0/10**-6;#V/s\n", "Vout=10.0;#V(magnitude of output voltage)\n", "fm=SR/(2*math.pi*Vout)/1000;#kHz\n", "print \"Full power bandwidth(kHz)\",round(fm,1)\n", "VT=25.0/1000;#V(Thermal voltage)\n", "ft=SR/(2*math.pi*4*VT)/10.0**6;#MHz\n", "print \"Unity gain bandwidth(MHz)\",round(ft,1)\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Full power bandwidth(kHz) 159.2\n", "Unity gain bandwidth(MHz) 15.9\n" ] } ], "prompt_number": 10 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Ex2.5:Pg-84" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Ex 2.5\n", "\n", "VCC=5;#V\n", "VEE=-5;#V\n", "VBE=0.6;#V\n", "VCE23=0.6;#V\n", "VCE_sat=0.2;#V\n", "Vo_max=VCC-VCE_sat-VBE;#V\n", "Vo_min=VEE+VCE_sat+VBE+VCE23;#V\n", "print \"Maximum output voltage(V)\",round(Vo_max,2)\n", "print \"Minimum output voltage(V)\",round(Vo_min,2)" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Maximum output voltage(V) 4.2\n", "Minimum output voltage(V) -3.6\n" ] } ], "prompt_number": 11 } ], "metadata": {} } ] }