CMOS stands for Complementary Metal-Oxide-Semiconductor and it is a type of technology used in the construction of digital logic gates. It consists of two types of transistors - NMOS and PMOS - that work together to create a high or low output voltage based on the input signals.
NAND and NOR gates are both types of logic gates that are used in digital circuits. The main difference between them is their output behavior. NAND gates produce a low output only when all inputs are high, while NOR gates produce a high output only when all inputs are low.
NAND and NOR gates can be constructed using a combination of NMOS and PMOS transistors. For a NAND gate, the NMOS transistors are connected in parallel and the PMOS transistors are connected in series. For a NOR gate, the NMOS transistors are connected in series and the PMOS transistors are connected in parallel.
CMOS technology has several advantages, including low power consumption, high noise immunity, and the ability to integrate large numbers of transistors on a single chip. It also allows for easy construction of complex gates, such as NAND and NOR gates, using a combination of simple transistors.
One limitation of CMOS technology is that it requires a certain amount of space to construct a gate, which can limit the number of gates that can be integrated on a single chip. Additionally, CMOS gates may have a slower response time compared to other types of logic gates, such as TTL gates.