Capacitance to code converter with sigma-delta modulator
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United States of America Patent
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Oct 1, 2013
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app pub date -
Nov 14, 2006
filing date -
Nov 14, 2006
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Abstract
An apparatus and method for converting a capacitance measured on a sensor element to a digital code. The apparatus may include a switching capacitor as a sensor element of a sensing device, and a sigma-delta modulator coupled to the sensor element to convert a capacitance measured on the sensor element to a digital code. The switching capacitor is in a feedback loop of the sigma-delta modulator. The method may include measuring a capacitance on a sensor element of a sensing device using a sigma-delta modulator, and converting the capacitance measured on the sensor element to a digital code.
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