Small-signal model: Difference between revisions

Revision as of 05:19, 9 January 2023

Revision as of 05:21, 9 January 2023

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A small signal is part of a model of a large signal. To avoid confusion, note that there is such a thing as a ''small signal'' (a part of a model) and a ''small-signal model'' (a model of a large signal).

A small signal model consists of a small signal (having zero average value, for example a sinusoid, but any AC signal could be used) superimposed on a bias signal (or superimposed on a DC constant signal) such that the sum of the small signal plus the bias signal gives the total signal which is exactly equal to the original (large) signal to be modeled. This resolution of a signal into two components allows the technique of superposition to be used to simplify further analysis. (If superposition applies in the context.) It may be confusing, but the name of this model of a large signal is that is is a

In analysis of the small signal's contribution to the circuit, the nonlinear components, which would be the DC components, are analyzed separately taking into account nonlinearity.