Question

the extremely high input impedance of a mosfet is primarily due to the

Answer 1

The extremely high input impedance of mosfet is primarily due to=>>
Absence of Its channel

Answer 2

MOSFET has  extremely  high input impedance because of the following reasons:

• The main reason for the high impedance of a MOSFET is the extremely small leakage current of its gate capacitor.

• The gate and the rest of the substrate body, channel, source, and drain are isolated by the formation of the Oxide layer which acts as a capacitor.
• Hence gate and rest of the parts have no connection between them, which means MOSFET has a very high input impedance.
• Due to the above reasons, MOSFET has an extremely high input impedance value.

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