A CMOS NOR gate is a digital logic gate that performs the logical NOR operation. CMOS stands for Complementary Metal-Oxide-Semiconductor, which is a technology used in designing and manufacturing integrated circuits. CMOS technology is known for its low power consumption and high noise immunity, making it widely used in various digital applications.
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.