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{
"metadata": {
"name": "",
"signature": "sha256:6400e06363df718a0205b64ca5c3fc7d61a14e362b1dd10172150d22b3db1e89"
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 4 : Communication Filters and Signal Transmission"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.5 Page No : 120"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math \n",
"from numpy import array,log10,sqrt\n",
"\n",
"# Variables\n",
"f = array([500., 2000., 10000.]); #frequency in Hz\n",
"\n",
"# Calculations\n",
"Af = 1/sqrt(1+(f/1000)**8); #Linear amplitude response\n",
"AdBf = 20*log10(Af);\n",
"\n",
"# Results\n",
"print ' f,Hz (Af) (AdBf)'\n",
"for i in range(3):\n",
" print ' %5i Hz %.5f %.3f dB'%(f[i],Af[i],AdBf[i])\n",
"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" f,Hz (Af) (AdBf)\n",
" 500 Hz 0.99805 -0.017 dB\n",
" 2000 Hz 0.06238 -24.099 dB\n",
" 10000 Hz 0.00010 -80.000 dB\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.6 Page No : 123"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math \n",
"\n",
"# Variables\n",
"L = 4.*10**-6; #Henry\n",
"C = 9.*10**-12; #Farad\n",
"R = 20.*10**3; #ohm\n",
"\n",
"# Calculations and Results\n",
"f0 = 1/(2*math.pi*math.sqrt(L*C)); #frequency in Hz\n",
"print 'a) The resonant frequency is f0 = %.2f MHz'%(f0*10**-6)\n",
"Q = R*math.sqrt(C/L)\n",
"print ' b) The Q is %i'%(Q);\n",
"B = f0/Q;\n",
"print ' c) The 3-dB bandwidth is B = %i KHz'%(B*10**-3);\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"a) The resonant frequency is f0 = 26.53 MHz\n",
" b) The Q is 30\n",
" c) The 3-dB bandwidth is B = 884 KHz\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.7 Page No : 125"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"# Variables\n",
"#misprinted example number\n",
"pulse_width = 2*10**-6; #second\n",
"rise_time = 10*10**-9; #second\n",
"\n",
"# Calculations and Results\n",
"B = .5/pulse_width; #in Hz\n",
"print 'a) The aproximate bandwidth for coarse reproduction is B = %i KHz'%(B*10**-3)\n",
"B = .5/rise_time;\n",
"print ' b) The aproximate bandwidth for fine reproduction is B = %i MHz'%(B*10**-6)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"a) The aproximate bandwidth for coarse reproduction is B = 250 KHz\n",
" b) The aproximate bandwidth for fine reproduction is B = 50 MHz\n"
]
}
],
"prompt_number": 7
}
],
"metadata": {}
}
]
}
|
