Radio Amateur Quiz Canadian License

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Question A-002-007-001

What determines the input impedance of a FET common-source amplifier?

Correct Answer

The input impedance is essentially determined by the gate biasing network

Explanation

In a common-source FET amplifier, the gate is effectively isolated from the channel (especially in MOSFETs), so the input impedance is primarily set by the external gate biasing resistors.

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