Low voltage precision switch

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage

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327 63, 327 65, 327 77, 327108, G05F 110

Patent

active

054670519

ABSTRACT:
A current switch circuit for operating with low supply voltages while not compromising dynamic range has been provided. The current switch circuit includes a differential pair of transistors having first (12) and second (20) transistors. The base of the first transistor is coupled to a bias voltage (V.sub.B) while its collector is coupled to an output (14) of the current switch circuit. The collector of the second transistor is coupled to a first supply voltage terminal while the base of the second transistor is coupled to a variable bias circuit (22) for alternately swinging the voltage applied to the base of the second transistor above or below the bias voltage applied to the base of the first transistor. When the voltage applied to the base of the second transistor is greater than the bias voltage applied to the base of the first transistor, a predetermined current is sunk from the output of the current switch. Otherwise, substantially zero current flows at the output of the current switch.

REFERENCES:
patent: 4280069 (1981-07-01), Kompelien
patent: 4284911 (1981-08-01), McKeon
patent: 4434408 (1984-02-01), Baba et al.
patent: 4629913 (1986-12-01), Lechner
patent: 5124581 (1992-06-01), Umeki
patent: 5130573 (1992-07-01), Nawa et al.
patent: 5144164 (1992-09-01), Sugimoto et al.
patent: 5321320 (1994-06-01), Collins
patent: 5363065 (1994-11-01), Dufour

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