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What does MOSFET mean?
- The metal–oxide–semiconductor field-effect transistor is a transistor used for amplifying or switching electronic signals. Although the MOSFET is a four-terminal device with source, gate, drain, and body terminals, the body of the MOSFET often is connected to the source terminal, making it a three-terminal device like other field-effect transistors. Because these two terminals are normally connected to each other internally, only three terminals appear in electrical diagrams. The MOSFET is by far the most common transistor in both digital and analog circuits, though the bipolar junction transistor was at one time much more common. In enhancement mode MOSFETs, a voltage drop across the oxide induces a conducting channel between the source and drain contacts via the field effect. The term "enhancement mode" refers to the increase of conductivity with increase in oxide field that adds carriers to the channel, also referred to as the inversion layer. The channel can contain electrons, or holes, opposite in type to the substrate, so nMOS is made with a p-type substrate, and pMOS with an n-type substrate. In the less common depletion mode MOSFET, detailed later on, the channel consists of carriers in a surface impurity layer of opposite type to the substrate, and conductivity is decreased by application of a field that depletes carriers from this surface layer.
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MOSFET also stands for:
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