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{
"metadata": {
"name": "",
"signature": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 13, Elementary theory of filters"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1, page 491"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"from math import pi\n",
"# design loss pass constant K-filter\n",
"k=600 #ohms\n",
"fc=2500 #Hz\n",
"l=(k/(pi*fc)) #H\n",
"c=((1/(pi*fc*k))) #farad\n",
"print \"Inductance = %0.1f mH\" %(l*10**3)\n",
"print \"Capacitance = %0.3f micro-F \" %(c*10**6)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Inductance = 76.4 mH\n",
"Capacitance = 0.212 micro-F \n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 2, page 492"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import pi\n",
"#T-type band pass filter\n",
"#given data :\n",
"K=500 # in ohm\n",
"f1=4 # in kHz\n",
"f2=1 # in kHz\n",
"L1=K/(pi*(f1-f2)) \n",
"Ls=L1/2 \n",
"print \"Inductance in each series arm, Ls = %0.2f mH \" %Ls\n",
"C1=(f1-f2)*10**3/(4*pi*K*f1*f2) \n",
"Cs=2*C1 \n",
"print \"Capacity in each series arm, Cs = %0.2f micro-F\" %Cs\n",
"L2=((f1-f2)*K*1e3)/(4*pi*f1*f2*1e6)*1e3 # mH\n",
"print \"Shunt arm inductance, L2 = %0.1f mH\" %L2\n",
"Csh=1*10**6/(pi*(f1-f2)*10**3*K) \n",
"print \"Capacity in shunt arm, Csh = %0.2f micro-F\" % Csh"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Inductance in each series arm, Ls = 26.53 mH \n",
"Capacity in each series arm, Cs = 0.24 micro-F\n",
"Shunt arm inductance, L2 = 29.8 mH\n",
"Capacity in shunt arm, Csh = 0.21 micro-F\n"
]
}
],
"prompt_number": 13
}
],
"metadata": {}
}
]
}
|
