A Bipolar Junction Transistor (BJT) is a type of transistor that uses both electron and hole charge carriers. It's a semiconductor device that can amplify or switch electrical signals. A BJT consists of three regions:
1. Emitter (E):
Heavily doped, it emits carriers (electrons or holes) into the base.
2. Base (B):
Thin and lightly doped, it controls the flow of carriers.
3. Collector (C):
Moderately doped, it collects carriers from the emitter via the base.
There are two types of BJTs:
- NPN: The current flows from the collector to the emitter when a positive voltage is applied to the base.
- PNP: The current flows from the emitter to the collector when a negative voltage is applied to the base.
BJTs are widely used in amplifying signals, switching, and as building blocks in various electronic circuits.
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