Question

How many transistors are used in a 4-input CMOS AND gate? How many of each type are used? Draw the circuit diagram.

Answer 1

A 4-input CMOS AND gate can be constructed using two 2-input AND gates connected in series.

How to explain

Each 2-input AND gate needs 4 transistors (2 NMOS and 2 PMOS), so when two of these are used together, the 4-input AND gate requires a total of 8 transistors (4 NMOS and 4 PMOS).

This arrangement allows the gate to handle multiple inputs effectively by successively using smaller components to achieve the desired logical operation.