{
"metadata": {
"name": "",
"signature": "sha256:2f949cb189e4ffe46407c71647ee02b403727da1a90ca5f4d17ddb91292bba92"
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"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": {}
}
]
}