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What is h11 also known as in a high frequency T model?

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What is h11 also known as in a high frequency T model?

(a) Input conductance

(b) Input resistance

(c) Output conductance

(d) Output resistance

I have been asked this question in unit test.

The question is from The High Frequency T Model in portion High Frequency Transistor of Electronic Devices & Circuits

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Right choice is (b) Input resistance

The explanation is: The parameter h11 can be calculated by short circuiting the output port. By doing so, we can calculate h11 = V1 / I1. Since this gives h11 the units of volts / ampere or in other words ohms, it is also known as input resistance in a high frequency T model.

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