Electronic Circuits/The BJT Modes

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Depending on the different bias conditions on the emitter-base Junction(EBJ) and the collector-base junction(CBJ), the following modes of operation of BJT are obtained:

Mode EB junction CB junction
Cut-off Reversed Reversed
Forward -Active Forward Reversed
Reverse -Active Reversed Forward
Saturation Forward Forward

It is important to note that these rules apply for the PNP transistor as well. We don't care how the diode gets forward biased, merely that it is forward biased.

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