Darlington
Transistor ( Darlington Amplifier )
- When two transistors are connected in the series in the Emitter follower configuration, it is called as Darlington Transistor.
Connection of
two transistors
- The emitter of the first transistor is connected to base of the second transistor and collector of the both transistors is connected together.
- The emitter current of the first transistor is the base current of the second transistor.
- The current gain of the both transistor is equal to
β = β1β2
Where
β = Combined
current gain of both transistor
β1 =
Current gain of first transistor
β1 =
Current gain of second transistor
Terminals
There are only
three terminals of the Darlington transistor
Why Darlington
transistor?
- When high current gain and high input impedance requires, the Darlington transistor is used.
Important features
- High input impedance
- High current gain
- Low output impedance
Application
- They are used in the applications where high input impedance and low output impedance as well as high current gain requires.
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