Current mirror with saturation limiting

Active solid-state devices (e.g. – transistors – solid-state diode – Integrated circuit structure with electrically isolated... – With pn junction isolation

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Details

257553, 257561, 257564, H01L 2507, H01L 25065, H01L 27082

Patent

active

055085512

ABSTRACT:
A transistor built on a substrate employs two collectors, an output collector and a secondary collector. The purpose of the secondary collector is to collect minority carriers at saturation and feed these minority carriers back to the input reference of a current mirror. This saturation current causes a decrease in the current through the input reference transistor and decreases the current in the output of the current mirror responsively, driving it away from saturation.

REFERENCES:
patent: 3958267 (1976-05-01), Frederiksen et al.
patent: 3987477 (1976-10-01), Krolik
patent: 4345166 (1982-08-01), Allen et al.
patent: 4807009 (1989-02-01), Fushimi et al.
patent: 5418386 (1995-05-01), Dos Santos, Jr. et al.

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