Voltage-activated, constant current sink circuit

Details Voltage-activated, constant current sink circuit Voltage-activated, constant current sink circuit

2007-07-24

2007-07-24

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S542000

Reexamination Certificate

active

10932815

ABSTRACT:
Voltage-activated and accurate current sink, and method of providing same. In one aspect, a circuit for accurately sinking current includes a zener diode coupled to a power source at the cathode of the zener diode, and first and second transistors, where the first transistor has its collector coupled to the power source and its base coupled to the cathode of the zener diode, and the second transistor has its base coupled to the anode of the zener diode and its emitter coupled to ground. A resistor is coupled between the emitter of the first transistor and the collector of the second transistor.

REFERENCES:
patent: 4864213 (1989-09-01), Kido
patent: 4868703 (1989-09-01), Borkowicz
patent: 4924122 (1990-05-01), Harris
patent: 5661643 (1997-08-01), Blakely et al.
patent: 5760625 (1998-06-01), Macks
patent: 6259287 (2001-07-01), Macks

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