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Which of the following four hybrid parameters is used to calculate reverse voltage gain in a high frequency T model?

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Which of the following four hybrid parameters is used to calculate reverse voltage gain in a high frequency T model?

(a) h11

(b) h12

(c) h21

(d) h22

I had been asked this question in examination.

This interesting 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) h12

The explanation: The hybrid parameter h12 can be calculated by open circuiting the input port in a high frequency T model. 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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