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What are the units of the off – diagonal h parameters?

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What are the units of the off – diagonal h parameters?

(a) Volt

(b) Ampere

(c) dimensionless

(d) Ohm

This question was addressed to me in unit test.

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

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The correct answer is (c) dimensionless

To explain: The off – diagonal elements of the hybrid parameter matrix are dimensionless. One of the diagonal parameters is measured in ohm while the other diagonal parameter is measured in mho.

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