Doubt with system stability

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Hi,
Is a system said to be stable if its phase degrades to 180 degrees before UGB but phase improves (due to a zero) at UGB. If yes what happens to the transient responce. Can some one help me out.
Thanks
 

Re: Doubt on stability

To ensure stability you have to look at both: Phase Margin and Gain Margin and as I understood in ur case the gain margin will be in negative meaning that ur system is unstable.
 

Doubt on stability

zero in RHP will degrades PM ,zero in LHP may be not .
 

Doubt on stability

Hi
use matlab and simulate it.
regards
 

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