Discussion
Would a five millivolt input still count as a small signal at the base?
Answer: B
Five millivolts is a fifth of the twenty-six millivolt thermal voltage, so the exponential is well approximated by its tangent and the small-signal analysis holds. The output amplitude is irrelevant to the question, which concerns the excursion at the device. A one-millivolt threshold is arbitrary. Judging smallness against the thermal voltage rather than against a fixed figure is what makes the criterion meaningful. The parameter that varies and the parameter that does not are worth naming before any substitution is attempted. The parameter that varies and the parameter that does not are worth naming before any substitution is attempted.
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