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US Patent: 4,816,752
Method and Apparatus for Low Power Offset Correction of Amplified Sensor Signals
Patentees:
Steven E. Michalski (exact or similar names) - Franklin, WI
Kevin M. Andrews (exact or similar names) - Rockford, IL
Daniel Mieczkowski (exact or similar names) - Kenosha, WI

USPTO Classifications:
324/130, 327/91, 330/9

Tool Categories:

Assignees:
Snap-On Tools Corp. - Kenosha, WI

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Apr. 07, 1988
Granted: Mar. 28, 1989

Patent Pictures:
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Snap-On Tools Company History
Description:
Emrich & Dithmar - patent attorneys

Abstract

A sensor is periodically energized and the sensor output is amplified, the amplified signal being applied to two sample-and-hold circuits which are alternately activated in response to the sensor drive, one being activated only when the sensor is energized and the other being activated when the sensor is not energized. One of the samples is subtracted from the other in a summer for cancelling the amplifier offset. The summer output may be buffered, and there is also applied to the summer an offset correction signal for cancelling sensor offset and buffer offset inaccuracies.

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