Capacitive sensing arrangement

  • US 7,764,274 B2
  • Filed: 07/03/2006
  • Issued: 07/27/2010
  • Est. Priority Date: 01/26/1998
  • Status: Active Grant
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First Claim
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1. A sensing device comprising:

  • two series connected switches having a common node, an input node, and an output node;

    a dielectric-covered sensing electrode connected to the common node;

    a power supply connected to the input node; and

    a capacitor coupled to the output node to accumulate charge transferred from the sensing electrode during multiple cycles of the switches, wherein the charge transferred from the sensing electrode relates to a sensed object.

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