Topic: Analog Circuits
Output impedance of a source follower is
- A. $1/g_{m}+r_{d}$
- B. $r_{d}/(1+g_{m}\cdot r_{d})$
- C. $r_{d}$
- D. None of these
Answer: B. $r_{d}/(1+g_{m}\cdot r_{d})$
Explanation: Out impedance $=\frac{r_{d}}{1+\mu}$. $R_{o}=\frac{r_{d}}{1+g_{m}r_{d}}$.