Question

What are the disadvantages of CE short circuit gain obtained with hybrid pi model circuits?

(a) Requires few resistors

(b) Provides a lot of stability

(c) Provides negative feedback

(d) Provides positive feedback

The question was asked in an online interview.

My question is based upon The CE Short Circuit Gain Obtained with the Hybrid PI Model topic in chapter High Frequency Transistor of Electronic Devices & Circuits

Answer 1

Correct option is (c) Provides negative feedback

Easiest explanation: A collector emitter bias circuit provides negative feedback as well as requires multiples resistors for a small change. The negative feedback limits the frequency range it will work in. Higher frequencies will provide poor performance. It also requires a greater number of resistors just to provide a stability against a small parameter.