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In a hybrid model, which parameter is known as the output conductance?

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In a hybrid model, which parameter is known as the output conductance?

(a) h11

(b) h12

(c) h21

(d) h22

This question was posed to me in an international level competition.

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

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Correct answer is (d) h22

Easy explanation: When the input terminal of a two – port device is open circuited, the input current flowing equals to zero. Hence the value of h22 = I2 / V2. The unit of this parameter is ampere / volt or mho. Hence it is known as output conductance.

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