Question

What happens if collector current increases in a CE short circuit gain obtained with hybrid pi model?

(a) Emitter voltage increases therefore base voltage increases

(b) Emitter voltage decreases therefore base voltage decreases

(c) Emitter voltage increases therefore base voltage decreases

(d) Emitter voltage decreases therefore base voltage increases

I got this question in class test.

The question is from The CE Short Circuit Gain Obtained with the Hybrid PI Model topic in portion High Frequency Transistor of Electronic Devices & Circuits

Answer 1

Correct answer is (a) Emitter voltage increases therefore base voltage increases

The explanation: If the collector current IC is increased, the corresponding emitter current also increases. Which in turn causes the voltage across RE to increase. This in turn causes a proportional rise in the base voltage since VB = VE + VBE .