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Which of the following four hybrid parameters is used to calculate reverse voltage gain?

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Which of the following four hybrid parameters is used to calculate reverse voltage gain?

(a) h11

(b) h12

(c) h21

(d) h22

The question was asked in an international level competition.

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

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Right answer is (b) h12

The explanation is: The hybrid parameter h12 can be calculated by open circuiting the input port. By doing so, we can calculate h12 = V1 / V2. Since this is a ratio between two voltage units, h12 is unitless. It is known as the reverse voltage gain of the circuit.

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