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//Example 8.1
clear;
clc;
T0=10^4;
f1=100;
f2=10^6;
f3=10*10^6;
w1=2*%pi*f1;
w2=2*%pi*f2;
w3=2*%pi*f3;
h=syslin('c',T0/[(1-(%s/w1))*(1-(%s/w2))*(1-(%s/w3))]);
gm=g_margin(h);
pm=p_margin(h);
printf("(a) Gain Margin(GM)=%.2f dB",gm);
printf("\n(b) Phase Margin(PM)=%.1f degrees",-pm);
f=512*10^3;
w=2*%pi*f;
T1=T0/[(1-((%i*w)/w1))*(1-((%i*w)/w2))*(1-((%i*w)/w3))];
den=1/(abs(T1)/T0);
printf("\n(c) T0 for PM=60 degrees=%.f",den);
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