Question

FET amplifier circuit shown in figure below has the following circuit values $R_0=10k\Omega ,R_D=10k\Omega$ and $g_m=4000\mu S$.

Voltage gain of the amplifier shown above is___

• A. -20

Answer 1

The correct option is A -20


$A=\frac{V_0}{V_i}=-g_m{R}_L$

$=-g_m\left[\frac{R_D{R}_0}{R_D+R_0}\right]=-4\times {10}^{-3}\left(5k\Omega \right)=-20$