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{{unreferenced|date=March 2018}}
'''Small-signal modeling''' is a common analysis technique in [[electronics engineering]] used to approximate the behavior of [[electronic circuit]]s containing [[nonlinear device]]s, such as [[diode]]s, [[transistor]]s, [[vacuum tube]]s, and [[integrated circuit]]s, with [[linear equations]]. It is applicable to electronic circuits in which the AC [[signal (electrical engineering)|signal]]s (i.e., the time-varying currents and voltages in the circuit) are small relative to the DC [[bias (electrical engineering)|bias]] currents and voltages. A small-signal model is an AC [[equivalent circuit]] in which the nonlinear circuit elements are replaced by linear elements whose values are given by the first-order (linear) approximation of their characteristic curve near the bias point.
== Overview ==
Many of the [[electrical component]]s used in simple electric circuits, such as [[resistor]]s, [[inductor]]s, and [[capacitor]]s are [[linear circuit|linear]].{{Citation needed|date=May 2022}} Circuits made with these components, called [[linear circuit]]s, are governed by [[linear differential equation]]s, and can be solved easily with powerful mathematical [[frequency ___domain]] methods such as the [[Laplace transform]].{{Citation needed|date=May 2022}}
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