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Bipolar Junction Transistors (BJT)

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.


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

812.png at 817.pngconstant


Collector current
 823.png


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

828.png 


Collector Current
833.png


Relation between
α and β

838.png 

Current Amplification Factor: 843.png 


Relation Between
γ and α 848.png


Collector current:
 853.png


Comparison of Transistor Connections

 

858.png 





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