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==Motivation==
Electronic circuits generally involve small time-varying signals carried over a constant [[bias]]. This suggests using an method akin to approximation by [[differentials]] to analyze relatively small perturbations about the [[bias point]]. Any nonlinear device which can be described quantitatively using a formula can then be linearized about a bias point by taking taking partial derivatives of the formula with respect to all governing variables. These partial derivatives can be associated with physical quantities (such as [[capacitance]], [[resistance]] and [[inductance]]), and a circuit diagram relating them can be formulated.
Small signal models exist for [[diodes]], [[field effect transistors]] and [[bipolar transistors]].
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