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{
"metadata": {
"name": "",
"signature": "sha256:d7e6ca5b0b3b9273677b365c5a5c5dfae6429b091a9cdd3065bc98b47d3ef56f"
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 13: Detectors and Mixers"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 13.1, Page 546"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#Variable declaration\n",
"P=10000. #average power (W)\n",
"V=1000. #amplitude (V)\n",
"\n",
"#Calculations&Results\n",
"W1=4*math.pi*10**6\n",
"Wc=2*math.pi*10**8\n",
"alpha = P/V**2\n",
"print \"alpha=%.2f\"%alpha\n",
"#(b)=\n",
"A=1000+2*225+2*150+2*75\n",
"peak_power=alpha*A**2\n",
"print \"A=%.0f V\\npeak_power=%.0f W\"%(A,peak_power)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"alpha=0.01\n",
"A=1900 V\n",
"peak_power=36100 W\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 13.2, Page 551"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Variable declaration\n",
"n=1\n",
"q=1.602*10**-19 #C\n",
"k=1.38*10**-23\n",
"T=290 #K\n",
"Is=10**-8 #A\n",
"\n",
"#Calculations&Results\n",
"a=q/(n*k*T)\n",
"Ib=0 #A\n",
"Rj=1/(a*(Ib+Is))\n",
"print \"(a)Rj=%d kohm\"%(Rj*10**-3)\n",
"Ib=100*10**-6\n",
"Rj=1/(a*(Ib+Is))\n",
"print \"(b)Rj=%.1f ohm\"%Rj"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"(a)Rj=2498 kohm\n",
"(b)Rj=249.8 ohm\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 13.3, Page 557"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Variable declaration\n",
"fc = 5*10**6 #hz\n",
"Vm = 1 #V\n",
"fm = 1*10**3 #Hz\n",
"\n",
"#Calculations&Results\n",
"#(a)\n",
"#Since the i/p frequency is multiplied by 12\n",
"fd = 10*12 #Hz\n",
"print \"Frequency deviation at output = +/-%d KHz\"%fd\n",
"\n",
"#(b)\n",
"fosc = 55*10**6 #i/p signal from oscillator (Hz)\n",
"fs = fosc+fc+fd*10**3\n",
"print \"\\nSum frequency at output = %.2f MHz\"%(fs*10**-6)\n",
"\n",
"#(c)\n",
"a=1\n",
"delf=10*1000\n",
"fm=1000\n",
"B=a*delf/fm\n",
"print \"\\nFrequency deviation = %d\"%B\n",
"\n",
"#(d)\n",
"a=2\n",
"delf=10*1000\n",
"fm=500\n",
"B=a*delf/fm\n",
"print \"\\nFrequency deviation = %d \"%B"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Frequency deviation at output = +/-120 KHz\n",
"\n",
"Sum frequency at output = 60.12 MHz\n",
"\n",
"Frequency deviation = 10\n",
"\n",
"Frequency deviation = 40 \n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 13.5, Page 573"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Variable declaration\n",
"IDss=50*10**-3 #mA\n",
"gm=200*10**-3 #mS\n",
"VL=.25 #V \n",
"RL=50 #ohms\n",
"\n",
"#Calculations&Results\n",
"Vp=2*VL #V\n",
"#gm=-2*IDss/Vp\n",
"Vp=2*IDss/gm #V\n",
"print \"Vp=%.2f V\"%Vp\n",
"gc=IDss/(2*Vp)\n",
"print \"gc=%.e S\"%gc\n",
"Av=gc*RL\n",
"print \"Av=%.1f\"%Av"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Vp=0.50 V\n",
"gc=5e-02 S\n",
"Av=2.5\n"
]
}
],
"prompt_number": 5
}
],
"metadata": {}
}
]
}
|
