Discussion
What causes distortion in a small-signal amplifier?
Answer: B
Distortion appears when the excursion is large enough that the exponential characteristic can no longer be replaced by its tangent, which is precisely the boundary of the small-signal assumption. Capacitor break points change the amplitude and phase without distorting the waveform, and loading and dissipation are separate concerns. A model's failure and the onset of distortion are the same event, which is why the small-signal condition matters practically.
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