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BJT-Bipolar Junction Transistor

Transistors are basic building blocks of electronics used for amplifiers and switching signals.


The basic definition of BJT is “It is a three terminal device whose output voltage/current or power is controlled by its input current.”

It is a current-controlled current source device.

In common base configuration, 
the ratio of output current to the input current is called Current Gain (α) or Current Amplification Factor of a transistor.

Current Gain
 is defined as “The ratio of change in collector current to the change in emitter current at constant collector - base voltage.

516.png at 521.pngconstant

Collector current 526.png 

Base amplification factor (β):-”It is defined as the ratio of change in collector current to the change in base current.”


Collector Current 536.png

Relation between
α and β


Current Amplification Factor: 

Relation Between
 γ and α 551.png

Collector current:

Comparison of Transistor Connections


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