Contents

Analog Electronics
Semiconductor Physics
Diodes & Applications
BJT Amplifiers
FET Amplifiers
Operational Amplifiers
Oscillators & Timers
Filters
Power Electronics Basics
Other Topics
Other Subjects
Section Progress83%

10 of 12 articles

Common Drain Amplifier

Source follower, unity voltage gain, high input impedance.

Mohith N
Updated: 19 March 2026
4 min read

Common Drain Amplifier

Test your knowledge of source follower voltage gain, output impedance, and buffering applications.

Question 1 of 3

Q1.A source follower (common drain) MOSFET amplifier has gm = 5 mA/V and RS = 2 kOhm (ro infinite). What is the voltage gain Av?