Precision current mirror

Details Precision current mirror Precision current mirror

1990-11-01

1992-02-18

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323312, G05F 326

Patent

active

050897691

ABSTRACT:
A current mirror having an input and an output, comprises a diode coupled to the input to which an input current is supplied for providing a bias potential thereacross; an output transistor having an emitter, base and collector, said base and said emitter being coupled respectively across said diode and said collector being coupled to the output, said output transistor being responsive to said diode means for providing an output current the magnitude of which is proportional to said input current; and a compensation circuit coupled to said base of said output transistor and being responsive thereto for producing an output current that is injected at the input of the current mirror for cancelling base current errors caused by the base current of said output transistor.

REFERENCES:
patent: 4536702 (1985-08-01), Nagano
patent: 4647841 (1987-03-01), Miller
patent: 4779061 (1988-10-01), Matthies
patent: 4978868 (1990-12-01), Giordano et al.

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