Circuit and method for sensing a differential capacitance
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United States of America Patent
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Dec 27, 2016
Grant Date -
Jul 2, 2015
app pub date -
Mar 13, 2015
filing date -
Apr 29, 2011
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Abstract
A circuit and a method for sensing differential capacitance involve using plural storing capacitors to repeatedly sample charges of the differential capacitance in an over-sampling manner, and storing the charges sampled in different transfer rounds into different storing capacitors instead of repeatedly transferring charges for a single storing capacitor, so as to collect charge averages about both inputs and noises and in turn effectively reduce RF interference and source noises.
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