Traditionally, the depletion MOSFET was classified as a linear device because the conduction channel between source and drain could not be pinched off and was thus unqualified for digital switching.

This CMOS two-input combination NAND/NOR gate is a three-input, fourpin logic gate. A p-channel enhancementtype MOSFET (Q1) and an n-channel enhancement-type MOSFET (Q4) form one complementary ...