Discussion
An amplifier with feedback shows a peaked frequency response and rings on a step. What should be adjusted?
Answer: D
Peaking with ringing is the signature of a small phase margin, so the remedy is compensation: a dominant pole to bring the crossover down, or a lead network to recover phase at it. Raising the closed-loop gain would also help, by reducing the loop gain, but it changes the amplifier's job rather than fixing it. Coupling capacitors and decoupling act elsewhere. A frequency-domain symptom and a time-domain one pointing at the same cause is the normal case, since they are two views of one response.
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