Question

What is the value of overall current gain in the hybrid-pi CE transistor model while considering RS ?

(a) AI × IB / IS

(b) AI × IC / IS

(c) AI × IS / IC

(d) AI × IS / IB

I have been asked this question by my college professor while I was bunking the class.

The query is from The Hybrid PI CE Transistor Model topic in section High Frequency Transistor of Electronic Devices & Circuits

Answer 1

The correct option is (a) AI × IB / IS

Easy explanation: The current gain in a simplified common emitter hybrid model while considering RS is calculated as the product of current gain without external parameters and the ratio of base current and external applied current. It is expressed as AI × IB / IS . Where, IS is the external applied current on the amplifier.