Discussion
What is gain margin?
Answer: A
Gain margin is how far below unity the loop gain has fallen at the frequency where the phase reaches inversion, quoted in decibels. It is the companion to phase margin, measured at the other of the two critical frequencies. The difference between open and closed-loop gains is the loop gain, and the gain at the break is fixed by definition. A loop can be comfortable on one margin and marginal on the other, which is exactly why both are specified. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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