Question

Which of the following is an independent variable in a linear analysis of a common base transistor?

(a) Base current

(b) Collector base voltage

(c) Collector current

(d) Collector emitter voltage

I had been asked this question in an interview.

My question is taken from Linear Analysis of a Transistor Circuit topic in division Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

Answer 1

Correct answer is (b) Collector base voltage

Easy explanation: In a linear analysis of a common base transistor, we have two independent variables. The collector base voltage is an independent variable and the collector current is the dependent variable. We can obtain IC using VCB from the characteristic curve.