Question

How do we calculate the inverse hybrid-pi conductance in low frequency H-parameters g12 of a two-port network?

(a) g12 = I2 / I1

(b) g12 = I1 / I2

(c) g12 = V1 / V2

(d) g12 = V2 / V1

This question was addressed to me in my homework.

My doubt stems from Hybrid PI Conductances in Low Frequency H Parameters in division High Frequency Transistor of Electronic Devices & Circuits

Answer 1

The correct choice is (b) g12 = I1 / I2

To explain I would say: The inverse hybrid-pi conductance in low frequency H-parameters g12 for a two-port network is calculated by short circuiting the input terminal. In this case, the current V1 is equal to zero. The parameter g12 is calculated by taking the ratio of input terminal current over output terminal current.