{
"metadata": {
"name": ""
},
"nbformat": 3,
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"CHAPTER 11 CC AND CB AMPLIFIERS"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 11-1, Page 348"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"VCC=10 #collector voltage(V)\n",
"RE=4.3 #Emitter resistance(KOhm)\n",
"R1=10 #Base resistance1 (KOhm)\n",
"R2=10 #Base resistance2 (KOhm)\n",
"VBE=0.7 #Base-emitter voltage drop(V)\n",
"RL=10 #Load Resistance(KOhm)\n",
"VG=1 #Input voltage(mV)\n",
"RG=0.6 #internal resistance of source(KOhm)\n",
"B=200 #current gain \n",
"\n",
"VBB=VCC/2 #Base voltage(V)\n",
"VE=VBB-VBE #Emitter voltage(V)\n",
"IE=VE/RE #Emitter current(mA)\n",
"re1=(25/IE) #AC resistance(Ohm)\n",
"re=RE*RL/(RE+RL) #external ac resistance(KOhm)\n",
"Zin_base=(re+(re1/1000))*B #input impedance of base(KOhm)\n",
"Zin_stage=((R1**-1)+(Zin_base**-1)+(R2**-1))**-1 #input impedance of stage(KOhm)\n",
"\n",
"print 'input impedance of stage Zin(base) = ',round(Zin_base,2),'KOhm'\n",
"print 'input impedance of stage Zin(stage) = ',round(Zin_stage,2),'KOhm'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"input impedance of stage Zin(base) = 606.4 KOhm\n",
"input impedance of stage Zin(stage) = 4.96 KOhm\n"
]
}
],
"prompt_number": 12
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 11-2, Page 349"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"re=3.03 #Emitter resistance(KOhm)\n",
"VG=1 #Input voltage(mV)\n",
"RG=0.6 #internal resistance of source(KOhm)\n",
"B=200 #current gain \n",
"Zin=5 #input impedance(KOhm)\n",
"\n",
"Vin=(Zin/(Zin+RG))*VG #input voltage(V)\n",
"\n",
"print 'Input voltage Vin = ',round(Vin,2),'V'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Input voltage Vin = 0.89 V\n"
]
}
],
"prompt_number": 11
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 11-3, Page 350"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"VCC=15 #collector voltage(V)\n",
"RE=2.2 #Emitter resistance(KOhm)\n",
"R1=4.7 #Base resistance1 (KOhm)\n",
"R2=4.7 #Base resistance2 (KOhm)\n",
"VBE=0.7 #Base-emitter voltage drop(V)\n",
"RL=6.8 #Load Resistance(KOhm)\n",
"VG=1 #Input voltage(mV)\n",
"RG=0.6 #internal resistance of source(KOhm)\n",
"B=150 #current gain \n",
"\n",
"VBB=VCC/2.0 #Base voltage(V)\n",
"VE=VBB-VBE #Emitter voltage(V)\n",
"IE=VE/RE #Emitter current(mA)\n",
"re1=(25/IE) #AC resistance(Ohm)\n",
"re=RE*RL/(RE+RL) #external ac resistance(KOhm)\n",
"Zin_base=(re+(re1/1000))*B #input impedance of base(KOhm)\n",
"Zin_stage=((R1**-1)+(R2**-1))**-1 #input impedance of stage(KOhm)\n",
"Av=re/(re+(re1/1000)) #Voltage gain of stage\n",
"Vin=(Zin_stage/(Zin_stage+RG))*VG #input voltage(V)\n",
"Vout=Av*Vin #output voltage(V)\n",
"\n",
"\n",
"print 'input impedance of stage Zin(base) = ',round(Zin_base,2),'KOhm'\n",
"print 'input impedance of stage Zin(stage) = ',Zin_stage,'KOhm'\n",
"print 'voltage gain of emitter follower Av = ',round(Av,3)\n",
"print 'Output volatge Vout = ',round(Vout,2),'V'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"input impedance of stage Zin(base) = 250.55 KOhm\n",
"input impedance of stage Zin(stage) = 2.35 KOhm\n",
"voltage gain of emitter follower Av = 0.995\n",
"Output volatge Vout = 0.79 V\n"
]
}
],
"prompt_number": 10
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 11-4, Page 353"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"RG=600 #internal resistance of source(KOhm)\n",
"B=300 #current gain \n",
"\n",
"Zout=RG/B #Output impedance(KOhm)\n",
"\n",
"print 'Output impedance Zout = ',Zout,'Ohm'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Output impedance Zout = 2 Ohm\n"
]
}
],
"prompt_number": 31
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 11-5, Page 353"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"VCC=30 #collector voltage(V)\n",
"RE=0.1 #Emitter resistance(KOhm)\n",
"R1=10 #Base resistance1 (KOhm)\n",
"R2=10 #Base resistance2 (KOhm)\n",
"RL=0.1 #Load Resistance(KOhm)\n",
"VG=1 #Input voltage(mV)\n",
"RG=0.6 #internal resistance of source(KOhm)\n",
"B=300 #current gain \n",
"\n",
"VBQ=VCC/2.0 #Base voltage(V)\n",
"VEQ=VBQ #Emitter voltage(V), ignore VBE\n",
"IEQ=VEQ/RE #Emitter current(mA)\n",
"re=(25/IEQ) #AC resistance(Ohm)\n",
"Zb=((RG**-1)+(R1**-1)+(R2**-1))**-1 #impedance looking back from base(KOhm)\n",
"Z=Zb*1000/B #impedance after current gain (Ohm) \n",
"Ze=Z+re #impedance looking back into emitter(Ohm)\n",
"Zout=(((RE*1000)**-1)+(Ze**-1))**-1 #Output impedance(Ohm)\n",
"\n",
"print 'Output impedance is Zout = ',round(Zout,2),'Ohm'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Output impedance is Zout = 1.91 Ohm\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 11-6, Page 355"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"VCC=10 #collector voltage(V)\n",
"RE=0.68 #Emitter resistance(KOhm)\n",
"RC=3.6 #Collector resistance (KOhm)\n",
"re=0.18 #Emitter resistance (KOhm)\n",
"R1=10 #Base resistance1 (KOhm)\n",
"R2=2.2 #Base resistance2 (KOhm)\n",
"RG=0.6 #internal resistance of source(KOhm)\n",
"VBE=0.7 #Base-emitter voltage drop(V)\n",
"RL=0.27 #Load resistance(KOhm)\n",
"B=100 #current gain \n",
"\n",
"VBB=(R1*R2/(R1+R2)) #Base voltage(V)\n",
"VE=VBB-VBE #Emitter voltage(V)\n",
"IE=VE/RE #Emitter current(mA)\n",
"re=(25/IE) #AC resistance(Ohm)\n",
"Zin=B*RL #input impedance (KOhm)\n",
"rc=((RC**-1)+(Zin**-1))**-1 #ac collector resistance(KOhm)\n",
"Av=rc/(re/1000) #voltage gain of stage\n",
"\n",
"print 'voltage gain of CE stage Av = ',round(Av,2)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"voltage gain of CE stage Av = 206.15\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 11-7, Page 355"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"VCC=10 #collector voltage(V)\n",
"RE=0.68 #Emitter resistance(KOhm)\n",
"RC=3.6 #Collector resistance (KOhm)\n",
"re=0.18 #Emitter resistance (KOhm)\n",
"R1=10.0 #Base resistance1 (KOhm)\n",
"R2=2.2 #Base resistance2 (KOhm)\n",
"RG=0.6 #internal resistance of source(KOhm)\n",
"VBE=0.7 #Base-emitter voltage drop(V)\n",
"RL=0.27 #Load resistance(KOhm)\n",
"B=100 #current gain \n",
"\n",
"VBB=10*(R2/(R1+R2)) #Base voltage(V)\n",
"VE=VBB-VBE #Emitter voltage(V)\n",
"IE=VE/RE #Emitter current(mA)\n",
"re=(25/IE) #AC resistance(Ohm)\n",
"rc=((RC**-1)+(RL**-1))**-1 #ac collector resistance(KOhm)\n",
"Av=rc/(re/1000) #voltage gain of stage\n",
"\n",
"print 'voltage gain of CE stage Av = ',round(Av,2)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"voltage gain of CE stage Av = 16.3\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 11-8, Page 358"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"VCC=15 #collector voltage(V)\n",
"RE=0.06 #Emitter resistance(KOhm)\n",
"R1=10.0 #Base resistance1 (KOhm)\n",
"R2=20.0 #Base resistance2 (KOhm)\n",
"RG=0.6 #internal resistance of source(KOhm)\n",
"VBE=0.7 #Base-emitter voltage drop(V)\n",
"RL=0.03 #Load resistance(KOhm)\n",
"B1=100 #current gain of Q1\n",
"B2=100 #current gain of Q2\n",
"\n",
"B=B1*B2 #Overall current gain\n",
"VBB=15*(R2/(R1+R2)) #Base voltage(V)\n",
"VE=VBB-(2*VBE) #Emitter voltage(V)\n",
"IE2=VE/RE #Emitter current(mA)\n",
"IB2=IE2/B2 #Base current of Q2(mA)\n",
"IE1=IB2 #emiter current of Q1(mA)\n",
"IB1=IE1*1000/B1 #base current of Q1(uA)\n",
"re=((RE**-1)+(RL**-1))**-1 #ac emitter resistance(KOhm)\n",
"Zin_base=B*re #input impedance of Q1(KOhm)\n",
"\n",
"print 'Overall current gain B = ',B\n",
"print 'base current of Q1 IB1 = ',round(IB1,2),'uA'\n",
"print 'input impedance at base of Q1 Zin(base) = ',Zin_base,'KOhm'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Overall current gain B = 10000\n",
"base current of Q1 IB1 = 14.33 uA\n",
"input impedance at base of Q1 Zin(base) = 200.0 KOhm\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 11-9, Page 361"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"Vin=20 #input voltage (V)\n",
"RL=15 #Load resistance(Ohm)\n",
"Vz=10 #voltage across zener(V)\n",
"B=100 #current gain\n",
"Rs=680.0 #series resistor(Ohm)\n",
"\n",
"Vout=Vz-0.7 #Output voltage approx.(V)\n",
"Iout=Vout/RL #Load current(A)\n",
"IB=Iout*1000/B #base current(mA)\n",
"Is=(Vin-Vz)*1000/Rs #current through series resistor(mA)\n",
"Iz=Is-IB #zener current(mA)\n",
"\n",
"print 'output voltage Vout = ',Vout,'V'\n",
"print 'Zener current Iz = ',round(Iz,2),'mA'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"output voltage Vout = 9.3 V\n",
"Zener current Iz = 8.51 mA\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 11-10, Page 362"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"Vin=30 #input voltage (V)\n",
"RL=100 #Load resistance(Ohm)\n",
"Vz=6.2 #voltage across zener(V)\n",
"B=100 #current gain\n",
"Rs=680.0 #series resistor(Ohm)\n",
"R1=1 #Resistor (KOhm)\n",
"R2=2 #Resistor (KOhm)\n",
"\n",
"Vout=(Vz+0.7)*(R1+R2)/R1 #Output voltage approx.(V)\n",
"I1=(Vz+0.7)/R1 #Load current(A)\n",
"Vout=I1*(R1+R2) #Output voltage(V)\n",
"\n",
"print 'output voltage Vout = ',Vout,'V'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"output voltage Vout = 20.7 V\n"
]
}
],
"prompt_number": 74
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 11-11, Page 365"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"VG=2 #AC input voltage (mV)\n",
"Vs=10 #supply volatge(V)\n",
"RL=10 #Load resistance(KOhm)\n",
"RG=50.0 #source resistor(Ohm)\n",
"R1=10 #Resistor (KOhm)\n",
"R2=2.2 #Resistor (KOhm)\n",
"RC=3.6 #collector resistor (KOhm)\n",
"RE=2.2 #emitter resistance(KOhm)\n",
"\n",
"VB=Vs*R2/(R1+R2) #Base voltage(V)\n",
"IE=(VB-0.7)*1000/RE #emitter current(uA)\n",
"re=(25/IE)*1000 #ac resistance(Ohm)\n",
"Zin=1000*((RE**-1)+((re/1000)**-1))**-1 #input impedance(KOhm)\n",
"Zout=RC #Output impedance(KOhm)\n",
"rc=((RC**-1)+(RL**-1))**-1 #collector resistance(KOhm)\n",
"Av=rc*1000/re #voltage gain\n",
"Vin=(Zin/(Zin+RG))*VG #input voltage(V)\n",
"Vout=Av*Vin #output voltage(mV)\n",
"\n",
"print 'output voltage Vout = ',round(Vout,2),'mVpp'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"output voltage Vout = 52.43 mVpp\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "code",
"collapsed": false,
"input": [],
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
}
]
}