High accuracy current mirror

Details High accuracy current mirror High accuracy current mirror

1994-10-27

1997-10-21

Hecker, Stuart N.

Electricity: power supply or regulation systems

Self-regulating

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

323316, 307 55, G05F 316

Patent

active

056800371

ABSTRACT:
A current mirror uses an operational amplifier to control the collector voltage of two mirroring transistors during operation. The operational amplifier is coupled to the collector of each mirroring transistor such that a differential in voltage between the collector will produce an output voltage which drives a MOS transistor. The MOS transistor, responsive to the output of the operational amplifier, adjusts the voltage at the collector of one of the mirroring transistors to restore equilibrium.

REFERENCES:
patent: 4573021 (1986-02-01), Widlar
patent: 4788478 (1988-11-01), Ishii et al.
patent: 5136293 (1992-08-01), Matsuo et al.
patent: 5325045 (1994-06-01), Sundby
patent: 5469111 (1995-11-01), Chiu

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