PMOS Meaning and
Definition
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PMOS stands for P-channel metal-oxide-semiconductor and refers to a type of field-effect transistor (FET) that is primarily used in the design and construction of integrated circuits (ICs). PMOS transistors are one of the two major types of MOSFETs, the other being NMOS transistors.
In a PMOS device, a silicon substrate is doped with acceptor impurities to create a positively charged channel. The channel itself, however, is not conductive until a positive voltage is applied to the gate terminal. When a positive voltage is applied, the channel gets depleted of electrons and thus becomes conductive. This means that PMOS transistors are turned off by positive voltage on the gate and turned on by a low voltage or zero voltage.
The operation of a PMOS transistor is based on the flow of holes as the majority carriers within the channel. When the transistor is turned on, a current can flow from the source to the drain terminal under the influence of the applied voltage. Conversely, when the transistor is turned off, the channel becomes non-conductive and blocks the flow of current.
PMOS transistors are widely used in digital circuits and are particularly suited for implementing logic gates with a positive logic convention. These transistors are known for their ability to operate on low power and their compatibility with complementary metal-oxide-semiconductor (CMOS) technology. CMOS circuits commonly use PMOS and NMOS transistors in combination to achieve the desired functionality and optimize power consumption.
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