Which of the following describes MOSFET construction?
The gate is formed by a back-biased junction
The gate is separated from the channel by a thin insulating layer✓Correct answer
The source is separated from the drain by a thin insulating layer
The source is formed by depositing metal on silicon
Explanation
MOSFET stands for metal-oxide-semiconductor field-effect transistor: the gate electrode sits on a thin oxide insulator over the channel, so essentially no gate current flows. A reverse-biased junction gate is instead a feature of a JFET.