![]() ![]() Emitter (E) - The emitter region is heavily doped with charge carriers that can be emitted into the base. Base (B) - The base is the middle layer of semiconductor material and controls the flow of charge carriers between the emitter and the collector. The two types of bipolar junction transistors are NPN and PNP, although only the NPN transistor will be considered in this module.īipolar Junction Transistor The three layers are called the base, emitter, and collector. This allows two different types of transistor to be created, depending on the order of the n-type and p-type semiconductor layers. To form the two junctions, the semiconductor material is arranged in three layers. Today, transistors are used in integrated devices where several thousand transistors are formed in a single device.īipolar Junction Transistor The bipolar junction transistor is a semiconductor device containing two p-n junctions. There are many different types of transistors, but in this assignment we will examine only the bipolar junction transistor. They can be found in driver circuits where the signal from an input or a process is not powerful enough to drive the output device. Although individual transistors have been replaced in many applications, transistors are still used in power gain applications. The Transistor The transistor is a semiconductor device that revolutionised electronics in the 1950s and 60s. ![]()
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