Question

How many hybrid parameters are there in a transistor circuit?

(a) 16

(b) 8

(c) 12

(d) 4

I had been asked this question in final exam.

Query is from Conversion Formulas for the Parameters of the Three-Transistor Configurations topic in section Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

Answer 1

Right option is (c) 12

To elaborate: There are a total of 12 hybrid parameters in a transistor circuit. There are four parameters for each mode of operation. Each mode of operation has only four working hybrid parameters, which are derived from the four basic hybrid parameters: h11, h12, h21 and h22. The 12 transistor parameters are: hib, hie, hic, hrb, hre, hrc, hfb, hfe, hfc, hob, hoe and hoc.