Question

Which of the following is the other name for Common Drain Amplifier?

(a) Source Follower

(b) Current Booster

(c) Voltage booster

(d) Voltage limiter

I have been asked this question by my school principal while I was bunking the class.

This key question is from The Common Drain Amplifier in section Field-Effect Transistors of Electronic Devices & Circuits

Answer 1

Correct choice is (a) Source Follower

To elaborate: The voltage gain for a Common Drain Amplifier, Av=1, hence the output at the source terminal follows the input provided to the gate terminal. Hence we call a Common Drain Amplifier as Source follower as the name itself says it the source terminal follows the input signal.