Discussion
Why does dominant-pole compensation cost bandwidth?
Answer: A
Making one pole dominant means moving it downward, so the open-loop response begins falling earlier than it otherwise would and the closed-loop bandwidth at a given gain is reduced. No second pole is added, the low-frequency gain is untouched, and the low end is unaffected. Buying stability with bandwidth is the standard exchange in feedback design, and it is why an uncompensated amplifier is faster but harder to use.
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