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Which hybrid parameter is used to calculate forward current gain in a two – port network?

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Which hybrid parameter is used to calculate forward current gain in a two – port network?

(a) h11

(b) h12

(c) h21

(d) h22

This question was posed to me in a national level competition.

My question is taken from Determination of the H-Parameters in chapter Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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Best answer
Correct option is (c) h21

Easiest explanation: The hybrid parameter h21 can be calculated by short circuiting the output port. By doing so, we can calculate h21 = I2 / I1. Since this is a ratio between two current units, h21 is unitless. It is known as the forward current gain of the circuit.

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