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Current Mirror (Constant Current Source)

As T2 is identical to T1, the emitter current of T2 will be equal to the emitter current of T1 which is equal to Iref. If transistor T2 operates in the active region, its collector current IC2 = Io which will be approximately equal to Iref. Here, the output current Io is a reflection or mirror of the reference current Iref. Therefore this circuit can be referred as current mirror.

Current mirror

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