![]() Here, the transistor works as an amplifier. Therefore, let’s look at the working areas of a BJT Active Region Bipolar junction transistors are three-terminal active devices that can either conduct or not depending on the gate bias. Transistors technically act as switches or amplification devices in electronic circuits. Consequently, there will be some current flow through the N-type semiconductor region. The negative charge carriers move from the valence to the conduction bands when they’re sufficiently excited. In this case, the majority of charge carriers are free electrons. NPN Bipolar Junction TransistorsĪn NPN transistor is a bipolar junction transistor that involves doping a P-type semiconductor material between two N-type materials. In this way, the base controls the number of charge carriers that pass from the emitter to the collector. The emitter supplies the positive charge carriers in PNP transistors, which pass through the base and onto the collector. BJT Transistors: PNP Bipolar Junction TransistorsĪ PNP transistor is a bipolar junction transistor that involves doping an N-type material between two P-type semiconductor materials. NPN transistors have more electrons in their structure, and electrons have higher mobility than holes. NPN transistors are more popular than PNPs as they offer better amplification.
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