Low-voltage multi-output current mirror circuit with improved po

Details Low-voltage multi-output current mirror circuit with improved po Low-voltage multi-output current mirror circuit with improved po

1995-06-16

1997-04-29

Nguyen, Matthew V.

Electricity: power supply or regulation systems

Self-regulating

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

323316, G05F 316

Patent

active

056252811

ABSTRACT:
A circuit technique for improving power supply rejection of current mirror circuits having multiple outputs. An input reference current is preadjusted for error caused by power supply variations and then mirrored through a cascade of current mirror circuits. In one embodiment an opamp loop forces the output of a current mirror circuit to be substantially equal to the reference current. This current is then used in subsequent mirroring stages to obtain various outputs. The circuit eliminates the need for including an error-subtraction transistor at every output.

REFERENCES:
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patent: 4525683 (1985-06-01), Jason
patent: 4647841 (1987-03-01), Miller
patent: 5089769 (1992-02-01), Petty et al.
patent: 5179355 (1993-01-01), Harvey
patent: 5245273 (1993-09-01), Greaves et al.
patent: 5420542 (1995-05-01), Harvey

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