Question

Show that at very low drain voltages a mosfet is equivalent to a resistance (5) which increases with increase in thickness of gate oxide.

Answer 1

Answer:

In other words, for an n-channel depletion mode MOSFET: +VGS means more electrons and more current. While a -VGS means less electrons and less current. The opposite is also true for the p-channel types. Then the depletion mode MOSFET is equivalent to a “normally-closed” switch.