![]() The active region is also called a linear region which lies in between the two regions like the cutoff & the saturation. So, the active region can be mainly used for the purpose of amplification wherever this transistor performs like an amplifier through a gain ‘β’ with the following equation Here, the base current (Ib) is used to control the quantity of Ic (collector current). In this region, one junction is connected in a forward bias whereas the other one is connected in reverse bias. The operating of BJT can be done in three different regions like active, saturation, and cut-off. So, between these three junctions, the BE junction can be connected in forwarding bias & the BC junction is reverse biased. The emitter section is doped highly as compared to the remaining layers.īoth the layers like base and collector include the same concentrations of charge carriers. The flow of charge within a transistor is because of the charge carrier’s diffusion among the two sections which belongs to different concentrations of charge carriers. In NPN transistor, two semiconductor junctions are there which have a thin anode region doped with ‘P’ whereas PNP transistor includes two semiconductor junctions that include a thin cathode region doped with ‘N’. Working of BJTīipolar junction transistor is classified into two types namely PNP and NPN based on types of doping of the terminals. The BE junction shows high resistance as this junction can be connected in reversed bias. So, being the central part of the BJT will allow it to manage the charge carriers flow among emitter & collector terminals. The base terminal is the most lightly doped segment in the transistor. The base terminal is the center part among collector & emitter terminals which forms two PN junctions among them. ![]() A wire lead unites to every region and these leads are branded with C, B & E for the collector, base, and emitter respectively. Similarly, once the pn-junction connects the base & the collector region then it is known as the BC-junction. When PN-junction connects the base and emitter region then it is known as BE-junction. In BJT, the term bipolar refers to the utilization of both the charge carriers like electrons and holes within the structure. In NPN, it includes two N-regions separated by one P-region whereas, in PNP, it includes two P-regions and separates with one N-region. Construction of Bipolar Junction Transistor These transistors are available in two types namely PNP and NPN and their physical structure is shown below. This transistor includes three layers namely base, emitter, and collector. So, the construction of BJT can be done through three doped semiconductor sections which are separated through two PN-junctions. The construction of BJT will determine its working characteristics.
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