Discussion
Why does a compensated amplifier have less bandwidth at a given gain?
Answer: C
Compensation moves a pole downward, so the open-loop gain starts to fall at a lower frequency and the closed-loop bandwidth at any chosen gain is correspondingly less. The closed-loop gain and the fraction are the designer's choice rather than consequences, and input capacitance is not what changes. Buying stability with bandwidth is the standard exchange, and it is why an uncompensated device is faster but usable only above some minimum gain.
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