Question

How is the h12 hybrid-pi conductance in low frequency H-parameters of a two-port network used?

(a) It is used as a voltage source at output port

(b) It is used as a current source at output port

(c) It is used as a voltage source at input port

(d) It is used as a current source at input port

This question was addressed to me in an interview for job.

My question is based upon Hybrid PI Conductances in Low Frequency H Parameters in portion High Frequency Transistor of Electronic Devices & Circuits

Answer 1

The correct answer is (c) It is used as a voltage source at input port

To explain I would say: While checking the hybrid-pi conductance in low frequency H-parameters equivalent network of a two-port network we see that the hybrid-pi conductance in low frequency H-parameters h12 is sued as a voltage source at the input port. While using Kirchhoff’s voltage law, the hybrid-pi conductance in low frequency H-parameters equations can be represented as a fixed voltage source of h21 V2 .