Transcription: The topic for this lesson is the bipolar junction transistor or BJT. A bipolar junction transistor is formed by using three doped semiconductor regions separated by two PN junctions. The device is called a bipolar junction transistor because the current flow involves carriers of both polarities, both holes and electrons. A BJT can be fabricated either as a PNP transistor or as an NPN transistor as shown in the illustrations. The central region is called the base. One of the junctions is forward biased and is called the emitter-base junction. The other junction is reverse biased and is called t ...
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