mm ok... my instructor definition is strange... but as one of the people of commented here wrote:
Maybe your instructor was making the following assumption: it is a simple control loop where most of the poles and zeros are much higher in frequency than the gain crossover frequency?
I understand that a PM and GM are as you said but lets say if I go in the way of my Maybe your instructor was making the following assumption: it is a simple control loop where most of the poles and zeros are much higher in frequency than the gain crossover frequency? for example I have a pole in 40 [rad/sec] and another at 100[rad/sec] and at 100[rad/sec] the gain go under 0 dB to lets say -25dB and the phase goes to 225 degree.
so at the way of my instructer the GM is 25dB and PM is 180-225
but at the general formula like you said the GM and PH could be smaller since its messured differently
for example the PM between 0dB and 180 degree could be 25 instead of 45
just make a small sketch to yourself and youll understand
since if you look from my point of view there are two possible answers one from the instructor and one from the internet
one could be 45 dgree 25 dB
and one could be 25 degree and lets say 15 dB and there is a difference so whats right..
sicne the instructer doesnt check that test its an external test and I am confused.. I have only a few days until that test.
and about fixxing the GM of PM how do I do it there is a formula for that but I need something simple
like adding a pole or a zero ( or adding a zerro or pole at some places) how do I do that...how do I know which W[rad/sec]
I should choose a=or should it be a pole or a zero or a mixed thing
sorry for troubling you so much