Radio Amateur Quiz Canadian License

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Question A-002-007-002

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

Correct Answer

The output impedance is essentially determined by the drain resistor

Explanation

For a common-source FET amplifier, the output impedance seen looking into the drain terminal is approximately equal to the drain load resistor (Rd) in parallel with the FET's output resistance (rd).

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