Define CMOS NOR gate and its logic operation.

The NOR gate is a two-input gate that produces a high output (logic '1') only when both of its inputs are low (logic '0'). In other words, it gives a low output when any of its inputs is high. The logic symbol for a NOR gate is an OR gate followed by an inversion circle, indicating the negation of the OR operation.

The truth table and logic operation of a two-input CMOS NOR gate are as follows:

Input A Input B Output

0 0 1

0 1 0

1 0 0

1 1 0

In terms of its operation:

If both input A and input B are low (0), the NOR gate produces a high output (1).

If either input A or input B is high (1), the NOR gate produces a low output (0).

This behavior makes the NOR gate useful for implementing various digital logic functions, including logical inversion (NOT), as well as building more complex logic circuits like flip-flops, memory cells, and arithmetic circuits.