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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"CHAPTER 9 AC MODELS"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9-1, Page 289"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"import math\n",
"\n",
"f=20 #frequency(Hz)\n",
"R=2 #Resistance(KOhm)\n",
"\n",
"XC=0.1*R #Capacitive reactance(Ohm)\n",
"C=(1/(2*math.pi*f*XC))*1000 #Capacitance(uF)\n",
"\n",
"print 'Capacitance C = ',round(C,2),'uF'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Capacitance C = 39.79 uF\n"
]
}
],
"prompt_number": 8
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9-2, Page 293"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"f=1 #frequency(KHz)\n",
"R1=600 #Resistance1(Ohm)\n",
"R2=1000 #Resistance2(Ohm)\n",
"\n",
"\n",
"RTH=R1*R2/(R1+R2) #Thevenin resistance(Ohm)\n",
"XC=0.1*RTH #Capacitive reactance(Ohm)\n",
"C=(1/(2*math.pi*f*XC))*1000 #Capacitance(uF)\n",
"\n",
"print 'Capacitance C = ',round(C,2),'uF'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Capacitance C = 4.24 uF\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9-3, Page 297"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"VCC=10 #collector voltage(V)\n",
"RE=1 #Emitter resistance(KOhm)\n",
"VBE=0.7 #Base-emitter voltage drop(V)\n",
"VEE=2 #Emitter supply voltage(V)\n",
"\n",
"IEQ=(VEE-VBE)/RE #Q point emitter current(mA)\n",
"iepp=0.1*IEQ*1000 #small signal emitter current(uA) \n",
"\n",
"print 'Q point emitter current IEQ = ',IEQ,'mA'\n",
"print 'Small signal emitter current iepp = ',iepp,'uApp'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Q point emitter current IEQ = 1.3 mA\n",
"Small signal emitter current iepp = 130.0 uApp\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9-4, Page 301"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"VCC=30 #Supply voltage(V)\n",
"RC=5 #Collector resistance (KOhm)\n",
"RL=100 #Emitter resistance (KOhm)\n",
"RB=1 #Base resistance (MOhm)\n",
"VBE=0.7 #Base-emitter voltage drop(V)\n",
"Bdc=100 #current gain\n",
"\n",
"IB=(VCC-VBE)/RB #Base current(mA)\n",
"IE=Bdc*IB/1000 #Emitter current(mA)\n",
"re=25/IE #AC resistance(Ohm)\n",
"\n",
"print 'Emitter current IE = ',IE,'mA'\n",
"print 'AC resistance re\\' = ',round(re,2),'Ohm'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Emitter current IE = 2.93 mA\n",
"AC resistance re' = 8.53 Ohm\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9-5, Page 302"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"VCC=10 #collector voltage(V)\n",
"RC=3.6 #Collector resistance (KOhm)\n",
"RE=1 #Emitter resistance (KOhm)\n",
"R1=10 #Base resistance1 (KOhm)\n",
"R2=2.2 #Base resistance2 (KOhm)\n",
"VBE=0.7 #Base-emitter voltage drop(V)\n",
"\n",
"VBB=(R2/(R1+R2))*VCC #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",
"\n",
"print 'Emitter current IE = ',round(IE,2),'mA'\n",
"print 'AC resistance re\\' = ',round(re,2),'Ohm'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Emitter current IE = 1.1 mA\n",
"AC resistance re' = 22.66 Ohm\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9-6, Page 302"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"VCC=10 #collector voltage(V)\n",
"RC=3.6 #Collector resistance (KOhm)\n",
"RE=1 #Emitter resistance (KOhm)\n",
"RB=2.7 #Base resistance (KOhm)\n",
"VBE=0.7 #Base-emitter voltage drop(V)\n",
"VEE=2 #emitter voltage(V)\n",
"\n",
"VE=VEE-VBE #Emitter to ground voltage(V)\n",
"IE=VE/RE #Emitter current(mA)\n",
"re=25/IE #AC resistance(Ohm)\n",
"\n",
"print 'Emitter current IE = ',IE,'mA'\n",
"print 'AC resistance re\\' = ',round(re,2),'Ohm'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Emitter current IE = 1.3 mA\n",
"AC resistance re' = 19.23 Ohm\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "code",
"collapsed": false,
"input": [],
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
}
]
}
|
