BJTs can operate in different modes depending on the junction bias:Ģ. The junctions between N and P regions are similar to the junctions in diodes and they can be forward-biased or reverse-biased as well. 2) while the NPN transistor has one P region between two N regions ( Fig. The PNP transistor has one N region between two P regions ( Fig. The semiconductor physics of BJTs will not be discussed here, but it is worth mentioning that a BJT is fabricated with three separately doped regions with two junctions.
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