Question

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

(a) Collector emitter voltage

(b) Collector current

(c) Emitter base voltage

(d) Emitter current

The question was asked in an online interview.

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

Answer 1

Right choice is (d) Emitter current

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