Question

What will happen if a capacitor is connected in parallel with RE in the amplifier design which uses emitter feedback bias circuit?

(a) No changes

(b) Gain value increases

(c) Feedback increases

(d) Gain value remains the same but feedback doubles

This question was posed to me at a job interview.

I'm obligated to ask this question of Emitter Feedback Bias in chapter Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits

Answer 1

Right answer is (b) Gain value increases

To explain I would say: Since the capacitor acts as a short circuit during high frequency, there will be no feedback and hence gain increases. All of the current will flow to ground through a capacitor which acts as a short circuit.