Question

How do we determine the hybrid parameters h11 and h21 in a high frequency T model?

(a) Short circuiting the input terminal

(b) Open circuiting the input terminal

(c) Short circuiting the output terminal

(d) Open circuiting the output terminal

I have been asked this question in homework.

I want to ask this question from The High Frequency T Model topic in portion High Frequency Transistor of Electronic Devices & Circuits

Answer 1

Right option is (c) Short circuiting the output terminal

Easiest explanation: There are four h parameters, they are: h11, h12, h21 and h22. To determine the values of h11 and h21 we need to short circuit the output terminal of a given two-port network. Short circuiting the output terminal makes the output terminal voltage V2 equal to zero.