The discussion centers on understanding phase margin and gain margin in control systems, specifically in relation to a circuit's stability. The phase margin is defined as the amount of phase lag required to reach -180 degrees at the 0 dB gain frequency. Participants noted that even at a 180-degree phase shift, the gain can still be greater than 0 dB, leading to confusion about the implications for gain margin and phase margin, particularly when gain margin is negative.
PREREQUISITESElectrical engineers, control system designers, and students preparing for exams in control theory will benefit from this discussion.
Notice that at 180 deg phase shift the gain is still > 0dB!Cocoleia said:
I'm not sure what I am supposed to looking at to figure this out thenrude man said:
So then my answer would be none of the above so it can be negative ?rude man said:
Cocoleia said:
