Small-signal modeling is a common analysis technique in electronics engineering which is used to approximate the behavior of electronic circuits containing nonlinear devices with linear equations. It is applicable to electronic circuits in which the AC signals, the time-varying currents and voltages in the circuit, have a small magnitude compared to the DC 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.
Application of the Small Signal Operation Example 5.14 Ø We wish to analyze the transistor amplifier shown in Fig. 5.53(a) to determine its voltage gain. Assume β=100 Example 5.14 (a) (b) Example 5.16 (c) Example 5.14 (c) Fig 5.55 C