High efficiency base current helper

Details High efficiency base current helper High efficiency base current helper

1996-12-20

2000-01-04

Cunningham, Terry D.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327540, 323316, G05F 110

Patent

active

060114274

ABSTRACT:
High efficiency base current helper to improve the accuracy of current mirrors particularly useful for current mirror utilizing relatively low beta bipolar junction transistors. The high efficiency base current helper utilizes two feedback loops, the first attempting to force the bias rail voltage to a mirror reference voltage and the second sensing excess current in the first loop and forcing it to match a reference level. This causes the first loop to be biased with no more excess current than desired for any process or temperature condition yielding dramatic reductions in wasted bias current. A specific exemplary embodiment is disclosed.

REFERENCES:
patent: 4350904 (1982-09-01), Cordell
patent: 4675594 (1987-06-01), Reinke
patent: 4700144 (1987-10-01), Thomson
patent: 4763021 (1988-08-01), Stickel
patent: 4952867 (1990-08-01), Anderson et al.
patent: 5485117 (1996-01-01), Furumochi
patent: 5493234 (1996-02-01), Oh
patent: 5506541 (1996-04-01), Herndon
"A 2.5-V Active Low-Pass Filter Using All-n-p-n Gilbert Cells with a 1-V.sub.pp Linear Input Range", Koyama et al., IEEE Journal of Solid-State Circuits, vol. 28, No. 12 (Dec. 1993).

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