Question

How do we calculate the value of IC in the simplified CE hybrid model?

(a) IC = hre × IB

(b) IC = -hre × IB

(c) IC = hfe × IB

(d) IC = -hfe × IB

This question was posed to me during an internship interview.

Enquiry is from Simplified CE Hybrid Model in section Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

Answer 1

The correct choice is (c) IC = hfe × IB

The best I can explain: The collector current of a common emitter (CE) amplifier can be expressed in terms of hybrid parameters in the simplified CE hybrid model. It is expressed as the product of hfe × IB. This is the same for approximate hybrid models as well.