Question

Which parameter of the physical model is varied while measuring the input characteristics of a CB short circuit current frequency response?

(a) Emitter current

(b) Emitter voltage

(c) Collector current

(d) Emitter base voltage

The question was asked at a job interview.

The doubt is from The CB Short Circuit Current Frequency Response in portion High Frequency Transistor of Electronic Devices & Circuits

Answer 1

Right option is (d) Emitter base voltage

Easiest explanation: To determine the input characteristics, the collector – base voltage is kept constant at zero volts and the emitter base voltage is increased from zero volts to different voltage levels. For each voltage level of the input voltage, the input current is recorded.