The BJT Modes

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Base on our simple model from the previous lesson we can define the four many modes of a BJT transistor

Mode EBJ junction CBJ junction
Cut-off Reversed Reversed
Active Forward Reversed
Reverse-Active Reversed Forward
Saturatied Forward Forward

It is important to note that these rules apply for the PNP transistor as well. We dont care how the diode gets forward biased, merely that it is forward biased.