Question

How do we specify gain margin and phase margin using relative stability?

Answer 1

$\huge{Heya}$

ANSWER:

Gain margin and phase margins are the measures of relative stability of a system.

Similar to continuous time case, we have to first define phase and gain cross over frequencies before defining gain margin and phase margin. 

Gain margin is the safety factor by which the open loop gain of a system can be increased before the system becomes unstable.

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