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There are three operating regions in transistor...(Transfer-Resistor)
1)cutoff region
2)Active region
3)Saturation region
Active region:
- It is the central region where there are curves and where slope is taken.
- it is the region where emitter-base is forward biased and collector-base is reversed bias.
Cutoff region:
- It is the region which lies below the curves. it is the region where the transistor is in OFF state.
- in this region both emitter-base and collector-base is reversed bias(i.e no sufficient voltage is applied so that the voltage does not break the DEPLETION region).
Saturation region:
- It is the region situated to near the active region near Y-axis.
- It is the region in which the both emitter-base and collector-base is forward biased.
Based on application the transistor is decided where to lie.
for example transistors are made to lie in active region to make it as amplifier.
when transistors are used as switch it is made to lie in saturation region(when switch is made as ON) and cut-off region(when switch is made as OFF).....
Thanks guys for reading this. please forgive me if there are any mistakes....
ANSWER: In actuality there is only one REGION The other regions are not operating regions but rather states. An operating region on a transistor is set up during design of an amplifier to transfer maximum undirstorted power to the load. This design is called BIAS
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operating region of the transistor is the area of the voltage and an electronic configuration in which a transistor can work with its full efficiency. In that operating region transistor can be used easily what above said by harsh is correct...the following may help u further... Based on application the transistor is decided where to lie. for example transistors are made to lie in active region to make it as amplifier. when transistors are used as switch it is made to lie in saturation region(when switch is made as ON) and cut-off region(when switch is made as OFF).....
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