Discussion
What does a small phase margin produce in the step response?
Answer: B
A marginally stable loop peaks in the frequency domain and rings in the time domain, so a step overshoots and takes several cycles to settle. A rounded rise indicates a wide phase margin and a modest bandwidth, droop is a low-frequency matter, and the final amplitude is set by the closed-loop gain. The frequency and time descriptions are two views of one response, so a margin can be assessed from a step just as readily as from a swept measurement.
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