Discussion
Why must the input amplitude be kept small while sweeping a response?
Answer: D
A large input drives the stage into non-linearity, and the resulting compression looks like a fall in gain, so the measured roll-off would be an artefact of the drive level rather than a property of the amplifier. Break frequencies are set by resistances and capacitances and do not move with amplitude, and neither the capacitors nor the bias point are the issue at reasonable levels. A measurement must not disturb the quantity it is measuring, and here that means staying inside the small-signal condition.
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