Transistor
Transistor:
It is a semiconductor device used to amplify or switch electronic signals and electric power.
It consists of at least three terminals such as emitter, base, collector.
Some transistors contain fourth terminal called substrate.
Tree diagram of Transistor:
It is a semiconductor device used to amplify or switch electronic signals and electric power.
It consists of at least three terminals such as emitter, base, collector.
Some transistors contain fourth terminal called substrate.
Tree diagram of Transistor:
Types of Transistor:
Bipolar Junction transistor:
It is a type of transistor that uses both electron and hole charge carriers.
It is classified into two types NPN and PNP.
NPN:
Majority charge carriers are electrons and minority charge carriers are holes.
A small amount of current at base terminal causes to flow large amount current from emitter to collector.
PNP:
Majority charge carriers are holes and minority charge carriers are electrons.
Current flows from emitter to collector.
Field effect transistor:
It has three terminals gate, drain and source.
It has control on size and shape of a channel.
Junction Field effect transistor:
It is available in both p-channel and n-channel
N-channel JFET:
Current flow due to electrons.
When voltage is applied between gate and source a channel is formed between source and drain.
P-channel JFET:
Current flow due to holes.
Metal oxide semi conductor field effect transistor:
It contains metal gate terminal.
It has four terminals drain, source, gate, body or substrate.
N-channel:
N region is between source and drain.
Current flow is because of electron concentration.
P-channel:
P region is between source and drain.
Current flow is because of hole concentration.
Disadvantages of transistor:
Manufacturing is complex.
Manufacturing requires clean room.
If we put into wrong way it cannot work.
Advantages of transistor:
It is of small size.
It is of lighter weight.
It produce less heat.
Consumes less power.
Application of transistor:
They are used in voltage amplifier.
They are used in gates.
Notes:
