![]() ![]() When a positive voltage is applied between source and gate (negative voltage between gate and source), a p-type channel with opposite polarities is formed between source and drain. A PMOS transistor consists of a p-type source and drain and an n-type substrate. Circuits with NMOS logic gates, however, consume static power when the circuit is idle, since DC current flows through the logic gate when the output is low. NMOS logic is easy to design and manufacture. There are three operating modes in a NMOS called cut-off, triode and saturation. Logic gates and other digital devices implemented using NMOSs are said to have NMOS logic. This allows the formation of an n-type channel between the source and the drain, and a current is conducted from electrons from the source to the drain through an induced n-type channel. When a voltage is applied to the gate, holes in the body (p-type substrate) are driven away from the gate. An NMOS transistor consists of n-type source and drain and a p-type substrate. CMOS technology uses less energy to operate at the same output and produces less noise during operation. Where CMOS is the combination of NMOS and PMOS. In an NMOS, carriers are electrons, while in a PMOS carrier are holes. ![]() NMOS is constructed with the n-type source and drain and a p-type substrate, while PMOS is constructed with the p-type source and drain and an n-type substrate. ![]()
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