Question

How many main types of alpha cutoff frequency are there in bipolar transistors?

(a) 3

(b) 4

(c) 5

(d) 6

I had been asked this question in an international level competition.

The origin of the question is The Alpha Cutoff Frequency topic in division High Frequency Transistor of Electronic Devices & Circuits

Answer 1

Right answer is (c) 5

The best I can explain: There are five main type of biasing circuits. They are Fixed Bias, Collector – to – Base Bias, Voltage Divider Bias, Fixed Bias with Emitter Resistor and Emitter Bias. Each one of these have a different alpha cutoff frequency value.