Method and apparatus for low power offset correction of amplifie

Details Method and apparatus for low power offset correction of amplifie Method and apparatus for low power offset correction of amplifie

1988-04-07

1989-03-28

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Self-calibration

307353, 328151, 330 9, G01R 102, G11C 2702

Patent

active

048167525

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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