High capacity current mirror circuit

Details High capacity current mirror circuit High capacity current mirror circuit

1987-05-19

1989-06-27

Roskoski, Bernard

Electricity: power supply or regulation systems

Self-regulating

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

323317, G05F 320

Patent

active

048433047

ABSTRACT:
A high capacity current mirror circuit comprises an operational amplifier electrically connected with its input, on the one side, to both a reference current source and a power supply pole through a first resistor, and on the other side, to said power supply pole through a second, feedback resistor, said amplifier being connected with its output to the base of a transistor, thereby supplying a current which is a mirror image of the reference current. According to the invention, that transistor is of the npn type, and in one embodiment, the transistor is connected in a Darlington configuration at the output of the operational amplifier which is of the transconductance type.

REFERENCES:
patent: 3914683 (1975-10-01), van de Plassche
patent: 4327320 (1982-04-01), Oguey et al.
patent: 4346344 (1982-08-01), Blauschild
patent: 4446419 (1984-05-01), van de Plassche et al.
patent: 4584535 (1986-04-01), Seevinck

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