Question

What is the magnitude of voltage generated at emitter circuit of a CE short circuit current frequency response model?

(a) hre × hfe / Ib × RL

(b) hre × hfe × Ib × RL

(c) hre × hfe / IC × RL

(d) hre × hfe × IC × RL

The question was posed to me in an internship interview.

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

Answer 1

Right choice is (b) hre × hfe × Ib × RL

The explanation: The magnitude of voltage generated at emitter circuit of a common emitter (CE) amplifier can be expressed in terms of hybrid parameters in the CE short circuit current frequency response model. The magnitude of voltage generated is equal to hre × hfe × Ib × RL where, RL is load resistance and Ib is the base current.