Question

How does the negative feedback help a CE short circuit gain obtained with hybrid pi model circuit?

(a) Helps make it more predictable

(b) Provides opposing change in base voltage

(c) Helps make it more predictable, provides opposing change in base voltage

(d) It doesn’t affect

The question was posed to me at a job interview.

I need to ask this question from The CE Short Circuit Gain Obtained with the Hybrid PI Model topic in chapter High Frequency Transistor of Electronic Devices & Circuits

Answer 1

Right answer is (c) Helps make it more predictable, provides opposing change in base voltage

Easy explanation: The negative feedback in a CE short circuit gain obtained with hybrid pi model circuit provides a negative feedback which in turn helps make the circuit more predictable as it provides opposing change in the base voltage which cancels out any change in the collector current.