fet
Definition
Noun: A FET (Field-Effect Transistor) is a type of transistor in which the flow of electrical current through a semiconductor channel is controlled by an applied electric field. The effective resistance of this channel can be modulated by a voltage applied to a terminal called the gate.
Usage
The term FET is a technical noun used primarily in electronics and electrical engineering. It is often used with articles ("a FET", "the FET") and can be modified by adjectives describing its type or function. * It is the fundamental building block of modern integrated circuits. * The engineer analyzed the FET's performance characteristics. * This amplifier design uses a junction FET.
Examples
- A FET operates by using an electric field to control the shape and conductivity of the channel.
- The input impedance of a FET is typically very high.
- Comparing the FET to the bipolar junction transistor reveals key differences in operation.
Advanced Usage
- Acronym Expansion: It is standard to spell out the acronym on first use in a document: "A field-effect transistor (FET) is used in the input stage."
- As a Modifier: FET is commonly used as an adjective in compound technical terms.
- FET amplifier, FET switch, FET characteristics
Variants and Related Words
- MOSFET (Noun): Metal-Oxide-Semiconductor Field-Effect Transistor. A very common type of FET where the gate is insulated from the channel by an oxide layer.
- The microprocessor contains billions of MOSFETs.
- JFET (Noun): Junction Field-Effect Transistor. A type of FET where the gate forms a PN junction with the channel.
- A JFET is often used in analog switching applications.
- Transistor (Noun): The broader category of semiconductor devices used to amplify or switch electronic signals, which includes FETs and bipolar transistors.
Synonyms
- Field-effect transistor (the full, non-acronym form)
- Unipolar transistor (a less common synonym emphasizing that current conduction involves only one type of charge carrier)
Related Phrases
- Gate terminal: The control electrode of a FET to which the controlling voltage is applied.
- Source terminal: The electrode from which charge carriers enter the channel.
- Drain terminal: The electrode to which charge carriers leave the channel.
- Channel: The semiconductor region through which current flows, whose resistance is controlled by the gate.
Noun
-
a transistor in which most current flows in a channel whose effective resistance can be controlled by a transverse electric field
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