Question

To keep the B.J.T. in the active region, what should be the relation between R1 and R2?

(a) R1 >> R2

(b) R1 << R2

(c) R1 = R2

(d) No such relation

I got this question in my homework.

I need to ask this question from Collector Feedback Configuration topic in chapter Transistor Biasing and Low Frequencies of Analog Circuits

Answer 1

Correct choice is (b) R1 << R2

For explanation I would say: The feedback resistance should be much smaller than the collector resistance since we need to reduce the sensitivity of the collector current to the current gain. Typically, R2 should be lower than R1 by a factor of β.