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<p> It is applicable to electronic circuits in which the AC <a href="page.php?w=signal_%28electrical_engineering%29">signal</a>s (i.e., the time-varying currents and voltages in the circuit) are small relative to the DC <a href="page.php?w=bias_%28electrical_engineering%29">bias</a> currents and voltages. A small-signal model is an AC <a href="page.php?w=equivalent_circuit">equivalent circuit</a> in which the nonlinear circuit elements are replaced by linear elements whose values are given by the first-order (linear) approximation of their characteristic</p><p>
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