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{
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"name": "",
"signature": "sha256:f8edf8ce3087d3427d18e8cd2380d8c52cf11f5604fcdfa69ecbcc1dd7de5bc3"
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"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter8 - Frequency synthesizers and PLL"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex 8.1 - page : 255"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"from math import sqrt, pi\n",
"VCC=6 #V\n",
"VEE=6 #V\n",
"RT=4 #kohm\n",
"CT=330 #pF\n",
"C=240 #pF\n",
"fo=0.3/(RT*1000*CT*10**-12)/1000 #kHz\n",
"print \"Free running frequency is %0.f kHz \" %fo\n",
"Vplus=(VCC-(-VEE))/2 #V\n",
"deltafL=8*fo/Vplus #kHz\n",
"print \"Lock Range(+ve & -ve) is %0.f kHz \" %deltafL \n",
"#For LM 565\n",
"R=3.6 #kohm\n",
"deltafC=sqrt(deltafL*1000/(2*pi*R*1000*C*10**-12))/1000 #kHz\n",
"print \"Capture Range(+ve & -ve) is %0.f kHz \" %deltafC\n",
"deltafP=2*deltafC/2 #kHz\n",
"print \"Pull-in Range is %0.f kHz \" %deltafP "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Free running frequency is 227 kHz \n",
"Lock Range(+ve & -ve) is 303 kHz \n",
"Capture Range(+ve & -ve) is 236 kHz \n",
"Pull-in Range is 236 kHz \n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex 8.2 - page : 256"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"from math import sqrt, pi, floor\n",
"fo=450 #kHz\n",
"deltafL=240 #kHz(+ve & -ve)\n",
"deltafC=40 #kHz(+ve & -ve)\n",
"Vplus=8*fo/deltafL #V\n",
"#Vplus=(VCC-(-VEE))/2 but |VCC|=|-VEE|\n",
"VCC=Vplus #V\n",
"VEE=Vplus #V\n",
"print \"For the design |VCC|=|-VEE| is %d Volt\" %VCC\n",
"RT=4.7 #kohm(Assumed for design)\n",
"R=3.6 #kohm\n",
"CT=0.3/(RT*1000*fo*1000)*10**12 #pF\n",
"C=1/((deltafC*10**3)**2*(2*pi*R*10**3)/(deltafL*1000))*10**9 #nF\n",
"print \"Value of RT = %0.2f kohm \" %RT\n",
"print \"Value of CT = %0.f pF \" %CT\n",
"print \"Value of C = %0.f nF \" % floor(C)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"For the design |VCC|=|-VEE| is 15 Volt\n",
"Value of RT = 4.70 kohm \n",
"Value of CT = 142 pF \n",
"Value of C = 6 nF \n"
]
}
],
"prompt_number": 10
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex 8.3 - page : 264"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"from math import log\n",
"fmax=160 #kHz\n",
"fr=4 #Hz(Resolution)\n",
"M=2.4 #unitless\n",
"fclk=M*fmax #kHz\n",
"print \"Clock frequency is %0.2f kHz \" %fclk\n",
"N=log(fclk*1000/fr)/log(2) #no. of bits\n",
"print \"No. of bits = %0.f \" % round(N) "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Clock frequency is 384.00 kHz \n",
"No. of bits = 17 \n"
]
}
],
"prompt_number": 12
}
],
"metadata": {}
}
]
}
|
