What Is a Field Effect Transistor?
A field effect transistor (FET) is a type of semiconductor that controls current flow primarily through voltage applied across its terminals. It’s crucial in digital and analog circuits, including CMOS technology.
The FET is characterized by three terminals: the gate, the drain, and the source. The voltage applied between the gate and source regulates charge flow within the device, effectively controlling the circuit’s current without direct contact.
Key advantages of FETs include their high input impedance, owing to the minimal current needed for gate control. This characteristic reduces the influence on connected circuits, making FETs ideal for high-speed switching and high-frequency operations. Their robustness in high-temperature and high-voltage environments further underscores their utility in a broad range of applications.