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Gate (1) The control electrode in a field-effect transistor (FET). A voltage applied to the gate regulates the conducting properties of the semiconductor channel region, which is usually located directly beneath the gate. In a MESFET (MEtal Semiconductor Field Effect Transistor), the gate is in intimate contact with the semiconductor. In a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), it is separated from the semiconductor by a thin oxide, typically 100-1000 angstroms thick. (2) The control electrode in a thyristor. A voltage applied to the gate allows the thyristor to pass current. (3) A combination of transistors which form a circuit that performs a logic function, such as NAND or NOR. |
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