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Capacitance to code converter with sigma-delta modulator

  • US 8,547,114 B2
  • Filed: 11/14/2006
  • Issued: 10/01/2013
  • Est. Priority Date: 11/14/2006
  • Status: Active Grant
First Claim
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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;

    switching the switching capacitor between a voltage source and a first node of a modulator capacitor of the sigma-delta modulator to provide a charge current to the modulator capacitor using a plurality of switches, wherein a first of the plurality of switches is coupled between the voltage source and a first node of the switching capacitor and the second of the plurality of switches is coupled between the first node of the switching capacitor and the first node of the modulator capacitor; and

    converting the capacitance measured on the sensor element to a digital code.

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