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Capacitive field sensor with sigma-delta modulator

  • US 9,400,298 B1
  • Filed: 01/03/2012
  • Issued: 07/26/2016
  • Est. Priority Date: 07/03/2007
  • Status: Active Grant
First Claim
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1. A capacitive sensor, comprising:

  • a switching capacitor circuit to reciprocally couple a sensing capacitor in series with a modulation capacitor during a first switching phase and to discharge the sensing capacitor during a second switching phase;

    a comparator coupled to compare a voltage potential on the modulation capacitor to a reference and to generate a modulation signal in response; and

    a charge dissipation circuit coupled to the modulation capacitor to selectively discharge the modulation capacitor in response to the modulation signal.

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