Discussion
Why is a zero useful in a compensation network?
Answer: A
A zero placed near a troublesome pole returns the slope to its previous value and the phase towards zero, recovering the margin the pole had cost. It does not raise the passband gain, cannot substitute for dominant-pole compensation in general, and has nothing to do with input capacitance. Cancelling an unwanted effect with an equal and opposite one is delicate, since the two must track, but it costs far less bandwidth than making one pole dominant.
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