Capacitance to code converter with sigma-delta modulator
First Claim
Patent Images
1. A method, comprising:
- measuring a capacitance on a sensor element of a sensing device using a sigma-delta modulator, wherein the sensor element is a switching capacitor in a feedback loop of the sigma-delta modulator; and
converting the capacitance measured on the sensor element to a digital code.
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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.
291 Citations
64 Claims
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1. A method, comprising:
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measuring a capacitance on a sensor element of a sensing device using a sigma-delta modulator, wherein the sensor element is a switching capacitor in a feedback loop of the sigma-delta modulator; and converting the capacitance measured on the sensor element to a digital code. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20)
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15. An apparatus, comprising:
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a sensor element, wherein the sensor element is a switching capacitor; and a sigma-delta modulator coupled to the sensor element to measure a capacitance on the sensor element and to convert the measured capacitance to a digital code wherein the switching capacitor is in a feedback loop of the sigma-delta modulator. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58)
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59. An apparatus, comprising:
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means for measuring a capacitance on a sensor element; and means for converting the capacitance measured on the sensor element to a digital code using a sigma-delta modulator. - View Dependent Claims (60, 61, 62, 63, 64)
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Specification