Question

What is the value of voltage gain in the CE short circuit current frequency response model?

(a) hfe × RL / hre

(b) –hfe × RL / hre

(c) hfe × RL / hie

(d) –hfe × RL / hie

The question was posed to me in an interview.

Asked question is from The CE Short Circuit Current Frequency Response in portion High Frequency Transistor of Electronic Devices & Circuits

Answer 1

Right choice is (d) –hfe × RL / hie

The best I can explain: The voltage gain of a common emitter (CE) amplifier can be expressed in terms of hybrid parameters in the CE short circuit current frequency response 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.