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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter : 14 - Phase-Locked Loops (PLL)"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 14.1 : Page No - 525\n"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from numpy import sqrt, pi\n",
"#Given data\n",
"R_T = 10 # in k ohm\n",
"R_T = R_T * 10**3 # in ohm\n",
"C_T = 0.005 # in \u00b5F\n",
"C_T = C_T * 10**-6 # in F\n",
"C=10*10**-6 # in F\n",
"f_out = 0.25/(R_T*C_T) # in Hz\n",
"print \"Free Running frequency =\",int(f_out*10**-3),\"kHz\" \n",
"# Part (ii)\n",
"V=20 # in V\n",
"f_L= 8*f_out/V # in Hz\n",
"print \"Lock range in kHz = \u00b1\",int(f_L*10**-3),\"kHz\"\n",
"# Part (iii)\n",
"f_C= sqrt(f_L/(2*pi*3.6*10**3*C)) # in Hz\n",
"print \"Capture range = \u00b1\",int(f_C),\"Hz\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Free Running frequency = 5 kHz\n",
"Lock range in kHz = \u00b1 2 kHz\n",
"Capture range = \u00b1 94 Hz\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 14.2 : Page No - 532\n"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import log\n",
"#Given data\n",
"f_out_max = 200 # in kHz\n",
"f_out_min = 4 # in Hz\n",
"f_CLK = 2.2*f_out_max # in kHz\n",
"print \"Frequency of reference oscillation = %0.f kHz\" %f_CLK \n",
"f_CLK= f_CLK*10**3 # in Hz\n",
"# Formula f_out_min= f_CLK/2**n\n",
"n=log(f_CLK/f_out_min)/log(2) \n",
"print \"The number of bits required in the phase accumulator = %0.f\" %round(n)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Frequency of reference oscillation = 440 kHz\n",
"The number of bits required in the phase accumulator = 17\n"
]
}
],
"prompt_number": 6
}
],
"metadata": {}
}
]
}
|
