Question

For a n-p-n transistor, the collector current changed from 0.2mA to 0.22mA resulting a change of base emitter voltage from 0.8v to 0.8005V. What is the value of Stability factor?

(a) 0

(b) 0.25

(c) 0.04

(d) 0.333

This question was addressed to me in unit test.

My question is based upon Bias Stability in division Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits

Answer 1

The correct option is (c) 0.04

For explanation: Change in Vbe = 0.0005V

Change in collector current = 0.02mA

S = 0.02m/0.0005 = 0.04.