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How do we calculate V1 in a two – port network?

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How do we calculate V1 in a two – port network?

(a) V1 = h21I2 + h22V2

(b) V1 = h11I1 + h12V2

(c) V1 = h11I2 + h12V2

(d) V1 = h21I1 + h22V2

The question was posed to me during an interview.

My question comes from Two-Port Devices and Hybrid Model topic in portion Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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Correct option is (b) V1 = h11I1 + h12V2

The explanation: We use the hybrid matrix parameters to calculate the input output voltage and current of the two ports. V1 is the input voltage from the first port and it is calculated using the formula: V1 = h11I1 + h12V2.

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