How is the h21 hybrid-pi conductance in low frequency H-parameters of a two-port network used?(a) It is used as a voltage source at input port(b) It is used as a current source at input port(c) It is used as a voltage source at output port(d) It is used as a current source at output portThe question was asked during an interview.I would like to ask this question from Hybrid PI Conductances in Low Frequency H Parameters topic in section High Frequency Transistor of Electronic Devices & Circuits

How is the h21 hybrid-pi conductance in low frequency H-parameters of

1.	How is the h21 hybrid-pi conductance in low frequency H-parameters of a two-port network used?(a) It is used as a voltage source at input port(b) It is used as a current source at input port(c) It is used as a voltage source at output port(d) It is used as a current source at output portThe question was asked during an interview.I would like to ask this question from Hybrid PI Conductances in Low Frequency H Parameters topic in section High Frequency Transistor of Electronic Devices & Circuits
Answer» RIGHT choice is (d) It is used as a current source at OUTPUT port To elaborate: 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 H21 is sued as a current source at the output port. While using Kirchhoff’s current law, the hybrid-pi conductance in low frequency H-parameters equations can be represented as a current source of h21 I1 .

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