Definition
A
transistor is a three terminal semiconductor device that can acts as a switch
or an amplifier depending on the bias conditions.
It
regulates the flow of current and voltage and can amplify it or can just act as
a switch.
The basic
operation of a transistor is of a switch, and is very largely utilized in
electronic devices.
Types of transistors:-
There are
two types of transistors depending upon the contribution of charge carriers in
the flow of current. These are:-
1. Uni-polar
2. Bipolar
Uni-polar
transistors:- As the name itself suggests (uni-pole means one pole) uni-polar
transistors are the type of transistors in which only on type of charge
carriers contribute to the transistor current.
Either electrons
will contribute or holes will contribute to the transistor current. We can say
that there are only majority charge carriers and no minority charge carriers. For
example: JFET, MOSFET.
Bipolar
transistors:- As the name itself suggests ( bi-pole means two poles) bipolar transistors are the type of
transistors that utilizes two charge
carriers namely electrons and holes simultaneously.
One of the
charge carriers act as the majority charge carrier and other as the minority charge
carrier.
For
example: BJT.
Majority
charge carriers:-
A type of
charge carriers that contribute to the main current or the charge carrier that
is responsible for the conduction of the current is called a majority charge
carrier.
The charge
carriers that are present in large quantity are called majority charge carriers.
Minority charge
carriers:-
The charge
carriers that are present in small quantity are called minority charge
carriers. The minority charge carriers carry very small amount of electric
charge or electric current in the semiconductor.
For bipolar transistor copy the following link to your url:
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For bipolar transistor copy the following link to your url:
https://transistorbasics.blogspot.in/p/blog-page.html
