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Capacitance in mosfet is of three types:

gate capacitance

diffusion capacitance

routing capacitance

Gate capacitance: limits the speed of the device t which it can be operated

Diffusion capacitance: It is the capacitance due to charge carriers between drain and source.

Routing capacitance: It is the capacitance of the metal which is deposited on the top of oxide layer.

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Q: Definition of a capacitance in mosfet?
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