Question

For emitter feedback bias, to make IC independent of DC current gain, which of the following condition is required?

(a) RC >> RB/dc current gain

(b) RE >> RB/dc current gain

(c) RB >> RC/dc current gain

(d) Re >> RC/dc current gain

This question was posed to me in a job interview.

This interesting question is from Emitter Feedback Bias in portion Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits

Answer 1

The correct answer is (a) RC >> RB/dc current gain

To explain I would say: In order to make the IC stable, the dc current gain has to be maintained in a proper constant value, and the Re value must be very much greater than (RB/ current gain). Since the value of RC becomes very high, this results in IC independent of beta.