Question

How is the input impedance of an emitter follower amplifier?

(a) Irrelevant

(b) Moderate

(c) Low

(d) High

The question was asked in an interview for job.

My doubt stems from The Emitter Follower topic in section Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

Answer 1

Right answer is (d) High

To explain I would say: The construction of an emitter follower circuit are approximately similar to a normal amplifier. One of the most important differentiating feature of an emitter follower circuit is its high input impedance.