Unformatted text preview: When analyzing AC input signals, the amplified output AC signal usually comes out a little distorted, because of non-uniform spacing of the drain characteristics. FETs are usually biased in the saturation region when used as amplifiers. In a small signal midband frequency analysis, a FET can be modeled by an equivalent circuit with a resistance if the device characteristic has a slope (nonlinear) in the saturation region. In this analysis, we can find the voltage and current gains for the circuit, as well as input and output impedances. The common source amplifier is inverting and can have a voltage gain that is larger than unity. The source follower is non-inverting and has voltage gain that is slightly less than unity, along with high current gain and low output impedance....
View Full Document
This document was uploaded on 02/16/2012.
- Spring '09