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{
"metadata": {
"name": "",
"signature": "sha256:841a88d7e9e844c5ea929c5620ee175fbc10b920d638293263fe8c73afe043c7"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter7: Integrated Circuit Timer And Phase Locked Loops (PLL) "
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex7.1:pg-339"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Ex 7.1\n",
"RA=6.8 #kohm\n",
"RB=3.3 #kohm\n",
"C=0.1 #micro F\n",
"VCC=5 #V\n",
"t_high=0.695*(RA+RB)*C #ms\n",
"print round(t_high,1),\" =(a) t_high(ms) \" \n",
"t_low=0.695*RB*C #ms\n",
"print round(t_low,2),\" =(b) t_low(ms) \" \n",
"f=1.44/(RA+2*RB)/(C) #kHz\n",
"print round(f,2),\" =(c) Frequency of oscillation(kHz) \" \n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"0.7 =(a) t_high(ms) \n",
"0.23 =(b) t_low(ms) \n",
"1.07 =(c) Frequency of oscillation(kHz) \n"
]
}
],
"prompt_number": 20
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex7.2:pg-339"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Ex 7.2\n",
"RA=10 #kohm\n",
"C=0.1 #micro F\n",
"t=1.1*RA*C #ms\n",
"print t,\"= Timing interval(ms) \" \n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"1.1 = Timing interval(ms) \n"
]
}
],
"prompt_number": 21
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex7.3:pg-352"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Ex 7.3 \n",
"fc=500 #kHz(Free running frequuency)\n",
"fi=600 #kHz(Input signal frequuency)\n",
"BW=10 #kHz\n",
"out1=fi+fc #kHz(Phase detector output)\n",
"out2=fi-fc #kHz(Phase detector output)\n",
"print out2,out1,\"= Output of phase detector will be(kHz) \" \n",
"print \"Both components are not lying in the passband(i.e. 10 kHz). Hence loop will not acquire lock. \" \n",
" #fi+fc is calculated wrong in the book.\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"100 1100 = Output of phase detector will be(kHz) \n",
"Both components are not lying in the passband(i.e. 10 kHz). Hence loop will not acquire lock. \n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex7.4:pg-352"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Ex 7.4\n",
"import math \n",
"fo=10.0 #kHz\n",
"V=12.0 #V\n",
"fL=round(8*fo/(V-(-V)),2) #kHz(both +ve & -ve value)\n",
"C=10 #micro F(Assumed)\n",
"fC=round(math.sqrt(fL*10**3/(2*math.pi*3.6*10**3*C*10**-6)),2) #Fz(both +ve & -ve value)\n",
"print fC,fL,\"= Frequency fL & fC in kHz \" \n",
"LR=2*fL #kHz(Lock Range)\n",
"print round(LR,1),\"= Lock Range(kHz) \" \n",
"CR=2*fC #kHz(Capture rage)\n",
"print round(CR,1),\"= Capture Range(Hz) \" \n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"121.33 3.33 = Frequency fL & fC in kHz \n",
"6.7 = Lock Range(kHz) \n",
"242.7 = Capture Range(Hz) \n"
]
}
],
"prompt_number": 28
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex7.5:pg-353"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Ex 7.5\n",
"import math\n",
" \n",
"fo=100.0 #kHz(Free running frequency)\n",
"V=6.0 #V(both +ve & -ve value)\n",
"C=1 #micro F(Demodulation capacitor)\n",
"fL=round(8*fo/(V-(-V)),3) #Hz(both +ve & -ve value)\n",
"fC=math.sqrt(fL*1000/(2*math.pi*3.6*10**3*C*10**-6)) #kHzz(both +ve & -ve value)\n",
"LR=round(2*fL,2) #kHz(Lock range)\n",
"print LR,\"= Lock Range(kHz)\" \n",
"CR=round(2*fC/1000,2) #kHz(Capture range)\n",
"print CR,\"= Capture Range(kHz) \" \n",
"RT=10 #kohm(Assumed)\n",
"CT=1.2/(4*RT*1000*fo*10**3) #F\n",
"print \"Design values are:\" \n",
"print \"Resistance RT can be chooosen as 10 kohm. \" \n",
"print CT,\" =Capacitance CT(F) \" \n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"133.33 = Lock Range(kHz)\n",
"3.43 = Capture Range(kHz) \n",
"Design values are:\n",
"Resistance RT can be chooosen as 10 kohm. \n",
"3e-10 =Capacitance CT(F) \n"
]
}
],
"prompt_number": 39
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex7.7:pg-355"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" #Ex 7.7\n",
"import math\n",
"C=1 #nF\n",
"T=10 #micro seconds(Output pulse duration)\n",
"R=round(T*10**-6/(C*10**-9*math.log(3))/1000,1) #kohm\n",
"print R,\" =(a) Value of R(kohm) \" \n",
"VCC=15 #V\n",
"T=20 #micro seconds(Output pulse duration)\n",
"VTH=VCC*(1-exp(-T*10**-6/(R*1000*C*10**-9))) #V\n",
"print round(VTH,1),\" =(b) Value of VTH(V) \" \n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"9.1 =(a) Value of R(kohm) \n",
"13.3 =(b) Value of VTH(V) \n"
]
}
],
"prompt_number": 41
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex7.8:pg-355"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" #Ex 7.8\n",
"import math\n",
"C=680.0 #pF\n",
"f=50.0 #kHz(Square wave frequency)\n",
"D=75.0/100.0 #duty cycle\n",
"T=1/f*1000 #micro seconds\n",
"tHIGH=D*T #micro seconds\n",
"print tHIGH,\" = Value of tHIGH \"\n",
"tLOW=T-tHIGH #micro seconds\n",
"print tLOW,\" = Value of tLOW \" \n",
"RB=(tLOW*10**-6)/(0.69*C*10**-12) #ohm\n",
"RA=(tHIGH*10**-6)/(0.695*C*10**-12)-RB #ohm\n",
"print round(RA/1000,1),\" = Value of RA(kohm) \" \n",
"print round(RB/1000,2),\" = Value of RB(kohm) \" \n",
"# Answer in the book is wrong for RA i.e. 21.2"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"15.0 = Value of tHIGH \n",
"5.0 = Value of tLOW \n",
"21.1 = Value of RA(kohm) \n",
"10.66 = Value of RB(kohm) \n"
]
}
],
"prompt_number": 62
}
],
"metadata": {}
}
]
}
|
