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 |
| Manufacturer: |
| Not known to have been produced |
|
|
Patent Dates:
|
| Applied: |
Apr. 07, 1988 |
| Granted: |
Mar. 28, 1989 |
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward
Stan Schulz
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.
|
|
