Common source amplifier with Voltage divider bias (Bypassed Rs)
Figure shows Common Source Amplifier With voltage divider Bias. The coupling capacitor C1 and C2 which are used to isolate the d.c biasing from the applied ac signal act as short circuits for ac analysis. Bypass capacitor Cs also acts as a short circuits for low frequency analysis.
The following figure shows the low frequency equivalent model for Common Source Amplifier With voltage divider Bias
The parameters are given by
The negative sign in the voltage gain indicates there is a 180o phase shift between input and output voltages.