Question

How the current gain of a common collector transistor amplifier expressed in terms of transistor hybrid parameters?

(a) -hfc / (1 + ZL × hrc)

(b) hfc / (1 + ZL × hrc)

(c) -hfc / (1 + ZL × hoc)

(d) hfc / (1 + ZL × hoc)

The question was asked during an online exam.

The doubt is from Analysis of Transistor Amplifier Circuit using h-parameters in chapter Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

Answer 1

Correct answer is (c) -hfc / (1 + ZL × hoc)

The best explanation: The current gain of a transistor amplifier circuit is expressed as -I2 / I1. This can be expressed in terms of transistor hybrid parameters. The current gain of a common collector transistor amplifier in terms of hybrid parameters is expressed as -hfc / (1 + ZL × hoc), where ZL is the load impedance.