Question

7. Why the low frequency and high frequenoy gate capacitance variation are
different in the inversion region. [2]​

Answer 1

Explanation:

Majority carriers, minority carriers, and interface states contribute to the MOS or MOSFET capacitance. Majority carriers can follow very high frequencies, but the minority carriers and a part of the interface states cannot follow high frequencies. This is why the contribution to capacitance from the interface states will be absent at high frequencies and also from the minority carriers in the MOS capacitor, but not in the MOSFET as the minority carriers are injected by the source into the MOSFET channel in strong inversion.

Answer 2

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