Honeywell International Inc.

James G Hiller

Paul M Werking

James Douglas Seefeldt

Mark Daniel Dvorak

Methods and systems are provided for comparing currents. The method includes driving a first current through a first X leg of a first current conveyor circuit and a second current through a second X leg of a second current conveyor circuit. The method further includes draining a third current from a first X terminal of the first current conveyor circuit to produce a first positive transistor current and a first negative transistor current, and draining a fourth current from a second X terminal of the second current conveyor circuit to produce a second positive transistor current and a second negative transistor current. The method further includes summing the first positive transistor current and the second negative transistor current to produce a first current output, the first negative transistor current and the second positive transistor current to produce a second current output, and the first current output and the second current output to produce a summed current output.

Methods and systems for comparing currents using current conveyor circuitry

A differential charge pump with common mode and active regulators is presented. Either type of regulator may be used to improve the performance characteristics of the differential charge pump. The active regulator increases the output range of the differential amplifier. The common mode regulator establishes the common mode voltage of the differential charge pump. The common mode voltage is established independently from external circuitry and does not use a feedback path. The common mode regulator may also be used to establish a mid-rail voltage, which may be used to further improve the output range of the differential amplifier.

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Minnetonka, MN, United States of America

James G Hiller