# **Razavi Electronics 1, Lec 38, Common-Source Stage with Degeneration**

Upload time : 2024/04/09

Video source : https://www.youtube.com/watch?v=qc6pDZJqFRs&list=PLyYrySVqmyVPzvVlPW-TTzHhNWg1J_0LU&index=39

## **Today's Lecture**

$\bullet$ MOS Current Source

$\bullet$ Other Variants of Common-Source Stage

## **Common-Source Stage with Common-Source Load**


$\lambda \neq 0$

$A_v=-gm_1(ro_1||ro_2)$

$R_{in}=infinite$

$R_{out}=ro_1||ro_2$

## **Common-Source Stage with Diode-Connected Device**


$\lambda = 0$

$A_v=-gm_1\frac{1}{gm_2}$

$R_{in}=infinite$

$R_{out}=\frac{1}{gm_2}$

$\lambda \neq 0$

$A_v=-gm_1(ro_1||\frac{1}{gm_2}||ro_2)$

$R_{in}=infinite$

$R_{out}=ro_1||\frac{1}{gm_2}||ro_2$