Capacitor Sensing Circuit
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United States of America Patent
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Issued Date -
May 29, 2014
app pub date -
Mar 12, 2013
filing date -
Nov 26, 2012
priority date (Note) -
Abandoned
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Abstract
The present invention provides a capacitor sensing circuit, comprising a driving unit, a switching unit, a differential integrator circuit, and a post-processing circuit. The driving unit is for providing driving signals and timing required by the capacitor sensing circuit, the switching unit switches signals according to two inverting timings, φ1 and φ2, the driving unit drives the capacitor sensing circuit, and together with the positive/negative input terminals of the differential integrator circuit, the signals are accumulated and integrated in both timing φ1 and φ2. The post-processing circuit receive the differential output of the differential integrator circuit for processing and/or utilizing the signals. The two timing signals are time-sharing signals in a period. Therefore, the capacitor sensing circuit is not effected by the common mode noise, and the accuracy and the sensibility are increased.
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