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+{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:2f949cb189e4ffe46407c71647ee02b403727da1a90ca5f4d17ddb91292bba92"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 6 - Schmitt Trigger Circuits and Voltage Comparators"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example E1 - Pg 179"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Caption:Determine schmitt trigger circuit components for designing it\n",
+ "u=5.#Upper trigger point voltage(in volts)\n",
+ "Vbe=0.7#Base emitter voltage(in volts)\n",
+ "I=2.#Collector current(in mA)\n",
+ "hfe=100.\n",
+ "Vcc=12.#Collector voltage(in volt)\n",
+ "Vce=0.2#Saturated collector emitter voltage(in volts)\n",
+ "Ve=u-Vbe\n",
+ "Re=Ve/I\n",
+ "Rc=(Vcc-Ve-Vce)/I\n",
+ "i=I/10.\n",
+ "R2=u/i\n",
+ "Ib2=I/hfe\n",
+ "I2=u/i\n",
+ "It=Ib2+i\n",
+ "r=(Vcc-u)/It\n",
+ "R1=r-Rc\n",
+ "print '%s %.2f %s %.2f %s %.f %s %.1f' %('Circuit components are \\nRe(in kilo ohm)=',Re,'\\nRc2(in kilo ohm)=',Rc,'\\nR2(in kilo ohm)=',R2,'\\nR1(in kilo ohm)=',R1)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Circuit components are \n",
+ "Re(in kilo ohm)= 2.15 \n",
+ "Rc2(in kilo ohm)= 3.75 \n",
+ "R2(in kilo ohm)= 25 \n",
+ "R1(in kilo ohm)= 28.1\n"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example E2 - Pg 181"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Caption:Find circuit components for designing a schmitt trigger circuit\n",
+ "u=5.#Upper trigger point voltage(in volts)\n",
+ "Vbe=0.7#Base emitter voltage(in volts)\n",
+ "I=2.#Collector current(in mA)\n",
+ "hfe=100.\n",
+ "Vcc=12.#Collector voltage(in volt)\n",
+ "Vce=0.2#Saturated collector emitter voltage(in volts)\n",
+ "l=3.#Lower trigger point voltage(in volts)\n",
+ "Ve=u-Vbe\n",
+ "Re=2.2\n",
+ "R1=23.6\n",
+ "Rc=(Vcc-Ve-Vce)/I\n",
+ "R2=22\n",
+ "i=I/10.\n",
+ "Ib2=I/hfe\n",
+ "I2=u/i\n",
+ "It=Ib2+i\n",
+ "r=(Vcc-u)/It\n",
+ "I1=l/R2\n",
+ "Ie=(l-Vbe)/Re\n",
+ "Rc1=Vcc-(I1*(r+R2))/Ie\n",
+ "\n",
+ "print '%s %.1f %s %.2f %s %.f %s %.1f' %('Circuit components are \\nRe(in kilo ohm)=',Re,'\\nRc1(in kilo ohm)=',Rc1,'\\nR2(in kilo ohm)=',R2,'\\nR1(in kilo ohm)=',R1)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Circuit components are \n",
+ "Re(in kilo ohm)= 2.2 \n",
+ "Rc1(in kilo ohm)= 4.98 \n",
+ "R2(in kilo ohm)= 22 \n",
+ "R1(in kilo ohm)= 23.6\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example E3 - Pg 183"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Caption:Determine Largest speed up capacitance\n",
+ "f=1.#Frequency(in Mhz)\n",
+ "R1=22.#Resistance(in kilo ohm)\n",
+ "R2=22.#Resistance(in kilo ohm)\n",
+ "Rc1=4.7#Resistance(in kilo ohm)\n",
+ "R=R1*(Rc1+R2)/(R1+Rc1+R2)\n",
+ "t=1./f\n",
+ "C=t*1000./(2.3*R)\n",
+ "print '%s %.f' %('Required Capacitance(in pF)=',C)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Required Capacitance(in pF)= 36\n"
+ ]
+ }
+ ],
+ "prompt_number": 4
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example E4 - Pg 186"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Caption:Calculate R1,R2 and Actual UTP and LTP\n",
+ "u=3.#Upper trigger voltage(in volts)\n",
+ "Ib=500.#Max base current(in nA)\n",
+ "Vcc=15.#Collector voltage(in volts)\n",
+ "i=Ib*0.1\n",
+ "R2=u*1000./i\n",
+ "I=u/R2\n",
+ "Vo=Vcc-1\n",
+ "Vr1=Vo-u\n",
+ "R1=Vr1/I\n",
+ "utp=Vo*R2/(R1+R2)\n",
+ "ltp=-utp\n",
+ "print '%s %.f %s %.f %s %.1f %s %.1f' %('Circuit components \\nR1(in kilo ohm)=',R1,'\\nR2(in kilo ohm)=',R2,'\\nactual UTP(in volts)=',utp,'\\nactual LTP(in volts)=',ltp)\n",
+ "\n",
+ "#utp and ltp values are corrected "
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Circuit components \n",
+ "R1(in kilo ohm)= 220 \n",
+ "R2(in kilo ohm)= 60 \n",
+ "actual UTP(in volts)= 3.0 \n",
+ "actual LTP(in volts)= -3.0\n"
+ ]
+ }
+ ],
+ "prompt_number": 5
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example E5 - Pg 189"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Caption:Design Schmitt circuit components R1,R2,R3,R4 and R5\n",
+ "u=3.#Upper trigger voltage(in volts)\n",
+ "Ib=500.#Max base current(in nA)\n",
+ "Vf=0.7#Forward diode voltage(in volts)\n",
+ "Vk1=-2.#Voltage(in volts)\n",
+ "Vcc=15.#Collector voltage(in volts)\n",
+ "Vk2=-Vk1\n",
+ "i=Ib*0.1\n",
+ "R2=u*1000./i\n",
+ "I=u/R2\n",
+ "Vo=Vcc-1\n",
+ "Vr1=Vo-u\n",
+ "R1=Vr1/I\n",
+ "I4=100.*i\n",
+ "Va1=Vk1+Vf\n",
+ "Vee=-Vcc\n",
+ "V4=Va1-Vee\n",
+ "R4=V4*1000./I4\n",
+ "Va2=Vk2+Vf\n",
+ "V5=Va2-Va1\n",
+ "R5=V5*1000./I4\n",
+ "R3=(Vcc-Va2)*1000./I4\n",
+ "print '%s %.f %s %.f %s %.2f %s %.2f %s %.f' %('R1(in kilo ohm)=',R1,'\\nR2(in kilo ohm)=',R2,'\\nR3(in kilo ohm)=',R3,'\\nR4(in kilo ohm)=',R4,'\\nR5(in kilo ohm)=',R5)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "R1(in kilo ohm)= 220 \n",
+ "R2(in kilo ohm)= 60 \n",
+ "R3(in kilo ohm)= 2.46 \n",
+ "R4(in kilo ohm)= 2.74 \n",
+ "R5(in kilo ohm)= 1\n"
+ ]
+ }
+ ],
+ "prompt_number": 6
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example E6 - Pg 192"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Caption:Design a non inverting schmitt trigger circuit\n",
+ "Vcc=15.#Collector voltage(in volts)\n",
+ "u=2.#Upper trigger point(in volts)\n",
+ "Ib=500.#Base current(in nA)\n",
+ "I2=Ib*0.1\n",
+ "Vo=Vcc-1\n",
+ "R2=Vo*1000./I2\n",
+ "i=Vo*1000./R2\n",
+ "R1=u*1000./i\n",
+ "print '%s %.1f %s %.f' %('Circuit components \\nR1(in kilo ohm)=',R1,'\\nR2(in kilo ohm)=',R2)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Circuit components \n",
+ "R1(in kilo ohm)= 40.0 \n",
+ "R2(in kilo ohm)= 280\n"
+ ]
+ }
+ ],
+ "prompt_number": 7
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+} \ No newline at end of file
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