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Result of excess voltage to CMOS devices

Describe what will happen when excess gate voltage is provided to the CMOS devices?

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Due to the thin layer of silicon dioxide between the gate and substrate, CMOS devices are having very high input resistance (estimated as infinite).The insulating layer is kept as thin as possible in order to provide the gate to have more control over the drain current .Thus, when the excess gate voltage is provided, the CMOS device will be easily destroyed.

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