A Junction Field-Effect Transistor (JFET) is a type of FET that controls current flow through a semiconductor channel using an electric field. It has three main terminals:
1. Source (S):
Where the current enters the device.
2. Drain (D):
Where the current exits the device.
3. Gate (G):
Controls the flow of current between the source and drain by applying voltage.
The current in a JFET flows through a channel either made of n-type or p-type semiconductor material. When voltage is applied to the gate, it creates an electric field that narrows or widens the channel, thereby controlling the current flow. The gate is reverse-biased, meaning little to no current flows into it, which gives JFETs their high input impedance.
JFETs are typically used in amplifier circuits, signal processing, and low-noise applications because they consume very little power and provide stable performance.
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