Question

How many methods of coupling are used for a differential amplifier with active load?

(a) 3

(b) 4

(c) 2

(d) 5

I have been asked this question in an interview for internship.

Origin of the question is Differential Amplifier with Active Load topic in chapter Differential and Multistage Amplifiers of Electronic Devices & Circuits

Answer 1

Correct choice is (b) 4

For explanation I would say: There are four types of coupling mechanisms used. They are Resistance – capacitance coupling, thermal coupling, impedance coupling and transformer coupling. Resistance – capacitance coupling is the most vastly used mechanism.