What are the basic gates in MOS logic family?
2024
What are the basic gates in MOS logic family?
- A.
NAND and NOR
- B.
AND and OR
- C.
NAND and OR
- D.
More than one of the above
- E.
None of the above
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Show answer & explanation
Correct answer: A
In the MOS (Metal-Oxide-Semiconductor) logic family—including PMOS, NMOS, and CMOS—it is structurally simpler and more efficient to build inverting gates rather than non-inverting ones.
Natural Inversion: A single MOS transistor stage naturally produces an inversion. Therefore, a basic arrangement of transistors results in a NAND or NOR function.
Constructing AND/OR: To create an AND or OR gate in MOS logic, you must first build a NAND or NOR gate and then add an additional Inverter (NOT gate) stage to the output.
Universal Gates: NAND and NOR are "universal gates," meaning any other logic function can be created using only these types of gates.