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//Example 13.3
clear;
clc;
Kv=10^4;
f0=10*10^3;
s=5*10^3;
fo1=20*10^3;
fo2=5*10^3;
K0=2*%pi*s;
wo1=2*%pi*fo1;
w0=2*%pi*f0;
vE1=(wo1-w0)/K0;
wo2=2*%pi*fo2;
vE2=(wo2-w0)/K0;
printf("(a) Control Voltage vE needed to lock the PLL on 20 kHz input signal=%.d V",vE1);
printf("\n Control Voltage vE needed to lock the PLL on 5 kHz input signal=%.d V",vE2);
wimod=2*%pi*10^3;
vemod=wimod/K0;
tau=1/Kv;
printf("\n\n(b) ve(t)=%.1f[",vemod);
printf("1-exp(-t/%.d",tau*10^6);
printf(" us)]u(t) V");
fm=2.5*10^3;
wm=2*%pi*fm;
wi1mod=2*%pi*10*10^3*0.1;
vewirat=(1/K0)/(1+((%i*2*%pi*fm)/Kv));
ve3=wi1mod*vewirat;
ve3mod=abs(ve3);
theta=(180/%pi)*atan(imag(ve3)/real(ve3));
printf("\n\n(c) ve(t)=%.4fcos(",ve3mod);
printf("%.2ft",wm);
printf("%.2f) V",theta);
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