Showing posts with label BJT basics. Show all posts
Showing posts with label BJT basics. Show all posts

17 Jul 2018

Basic Structure of Bipolar Junction Transistor (BJT) - BJT Transistor - Working and Properties

In this post we will discuss the Bipolar Junction Transistor (BJT). The basic structure of BJT and its various properties will be explained here in detail.


Structure of Bipolar Junction Transistor (BJT)

The diagram shown below is the basic structure of Bipolar Junction Transistor-


Structure of Bipolar Junction Transistor (BJT), construction of Bipolar Junction Transistor (BJT), structure of bjt transistor
Structure of Bipolar Junction Transistor (BJT)

The reason behind why it is known as bipolar junction transistor is; it has two types of charge carriers- electrons and holes. These electrons or holes may be present in majority or minority in BJT.


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While in case of Field Effect Transistors (FETs) and Metal Oxide Semiconductor Field Effect Transistors (MOSFETs), we have only one type of charge carriers in majority, either electrons or holes. Minority charge carriers are not present in FETs or MOSFETs. Therefore FETs and  MOSFETs are known as unipolar devices.
You can easily see the emitter region, base region and the collector region in the diagram of bipolar junction transistor shown above. These three regions form two junctions.
The junction formed by emitter and base regions is known as emitter-base Junction or emitter junction while the base and collector regions form the collector-base Junction (collector Junction).