Discussion
What makes a signal small in the small-signal sense?
Answer: A
A signal is small when the excursion is short enough that the curved characteristic can be replaced by its tangent without material error - for a bipolar device that means tens of millivolts at the base rather than any fixed figure. Frequency and power are separate considerations. The definition is about linearity rather than about magnitude in absolute terms, which is why the same amplitude can be small in one circuit and large in another. Most errors on this topic come from carrying a result across from a neighbouring scheme where it does not hold. Most errors on this topic come from carrying a result across from a neighbouring scheme where it does not hold.
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