Question

What is the function of RE in the collector emitter feedback circuit?

(a) To improve stability and decrease positive feedback

(b) To improve stability and increase positive feedback

(c) To improve stability and decrease negative feedback

(d) To improve stability and increase negative feedback

I have been asked this question in class test.

This is a very interesting question from Collector-Emitter Feedback Bias in section Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits

Answer 1

The correct answer is (d) To improve stability and increase negative feedback

For explanation I would say: In a collector feedback circuit, the emitter resistor provides additional stability along with increasing the negative feedback sent to the collector. The addition of the emitter resistance enables the transistor’s emitter to no longer be grounded to zero – volt potential.