Question

What happens to the h parameters of a transistor when the operating point of the transistor changes?

(a) It also changes

(b) Does not change

(c) May or may not change

(d) Nothing happens

This question was posed to me during a job interview.

My question is taken from Transistor Hybrid Model in division Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

Answer 1

The correct choice is (a) It also changes

Easiest explanation: It is very difficult to get exact values of h parameters for a particular transistor. It is because these parameters are subject to considerable variation unit to unit variation, variation due to change in temperature and variation due to the operating point.