Question

In MOSFETs a breakdown may occur at around 30 V. This is due to

(a) Velocity saturation

(b) Breakdown of the gate diode

(c) Sudden decrease in the depletion region

(d) Fall of the threshold voltage due to impurities

The question was posed to me in an interview for job.

Enquiry is from The Body Effect in portion MOS Field Effect Transistors (MOSFETs) of Electronic Devices & Circuits

Answer 1

Correct answer is (b) Breakdown of the gate diode

To explain: The breakdown of the oxide at the gate may occur when the voltage is around 30 V. This may also permanently damage the device.