Question

What is the path of the input characteristic of a CB transistor physical model?

(a) Linear

(b) Exponential decrease

(c) Exponential increase

(d) Constant

This question was addressed to me in a job interview.

This is a very interesting question from Physical Model of a CB Transistor in portion Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

Answer 1

The correct option is (a) Linear

For explanation I would say: In a physical model of a common base transistor, the input characteristic curve increases exponentially. The emitter current increases exponentially with respect to emitter base voltage for fixed values of collector base voltage.