Bipolar Junction Transistor BJT an Overview
The bipolar junction transistor was developed by Dr. Shockley along with Bell Laboratories in 1947.
For the first time, this component was used in commercial venture in 1948, when the Bell system employed transistor circuits in the telephone switching circuits.
since then it has revolutionized the field of electronics.
The BJT is a main building block of all modern electronic systems.
It is a three terminal device whose output current, voltage, and/or power are controlled by its input current.
In communication systems, it is used as a primary component in the amplifier.
An amplifier is a circuit that is used to increase the strength of an ac signal.
In digital computer electronics, the BJT is used as a high-speed electronic switch that is capable of switching between two operating states (open and closed).