Question

How do we determine the hybrid parameters h12 and h22 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 got this question in my homework.

I'm obligated to ask this question of The High Frequency T Model topic in portion High Frequency Transistor of Electronic Devices & Circuits

Answer 1

Right option is (b) Open circuiting the input terminal

To elaborate: From the four hybrid parameters, to determine the value of h12 and h22 we need to open circuit the input terminal. This in turn makes the current from the input terminal I1 equal to zero. It is the same procedure in a high frequency T model.