These electrons will attempt to recombine with the majority base holes, however, because the base is physically thin and lightly doped, only a small percentage of the injected electrons will recombine with base holes and exit the base terminal back to ground. As long as there is sufficient potential from the emitter supply, the electrons will be pushed into the base. The base-emitter depletion creates an energy hill just as it did with a single PN junction. The three terminals are called the emitter, base, and collector. BJTs have three terminals, one for each doped region. Automatic switch: It can be used instead of manual switch in an. This makes the device capable of performing switching or amplification. BJTS are used in inverter for changing the direction of DC current and become AC current. A bipolar junction transistor lets a small current be injected at one of its terminals to control large amounts of current flowing between the other two terminals. From the left side of the diagram, electrons exit the emitter supply and enter the N emitter. Bipolar junction transistors are a type of transistor that is made from three doped regions, in an PNP or NPN configuration, and which use both electrons and holes as charge carriers. A bipolar junction transistor is a single silicon component where electrons and holes are used as charge carriers. 3.3.1 which shows the basic doping of a junction transistor and Fig. \): Forward-reverse bias, electron flow.Įlectron flow will facilitate this explanation so we'll draw the current directions using dashed lines. The way a transistor works can be described with reference to Fig.
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