Homework Answers
I have use matlab to determine the PM and GM. Following are the matlab commands.
>> s=tf('s')
>> G=(5432*38.66*10^-3)/((1+s/(4*pi*10^3))*(1+s/(6*pi*10^4))*(1+s/(8*pi*10^5)))
G =
1.25e18
------------------------------------------
s^3 + 2.714e06 s^2 + 5.077e11 s + 5.953e15
>> bode(G); margin(G); grid on
The system is not stable, because Phase Margin is 1.4 degree. To be stable, the system must have Phase margin greater than 45 degree.
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