Question

What is the value of voltage gain in the hybrid-pi CE transistor model?

(a) hfe × RL / hre

(b) –hfe × RL / hre

(c) hfe × RL / hie

(d) –hfe × RL / hie

The question was asked during an online exam.

My enquiry is from The Hybrid PI CE Transistor Model topic in chapter High Frequency Transistor of Electronic Devices & Circuits

Answer 1

Correct option is (d) –hfe × RL / hie

Explanation: The voltage gain of a common emitter (CE) amplifier can be expressed in terms of hybrid parameters in the hybrid-pi CE transistor model. The voltage gain is equal to -hfe × RL / hie where, RL is load resistance, hie is input resistance and -hfe is the current gain.