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2 part question here.

Are there ways to directly test the input and output capacitance of a MOSFET, Ciss and Coss? On that note, due to internal inductance and capacitance, is it possible for a standalone MOSFET to resonate at certain frequencies?

Thank you in advanced.

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YES,YES 1) See best datasheets for test methods.

2) All traces have ESL starting at ~0.5nH/mm and scope probes are also notorious for ground ESL resonance with 10:1 coax xx pF, for resonance <50 MHz, thus tip/ring method is best between to nearby pins <1cm apart with gnd clip and probe tip both removed.

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Depending on the FET fabrication method, you may find Rgate and Rsubstrate are adequate to dampen the resonances.

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