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MEASURING CIRCUIT AND MEASURING METHOD FOR A CAPACITIVE TOUCH-SENSITIVE PANEL

  • US 20160018867A1
  • Filed: 06/30/2015
  • Published: 01/21/2016
  • Est. Priority Date: 07/18/2014
  • Status: Active Grant
First Claim
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1. A measuring circuit connectable to a capacitive touch-sensitive panel, the panel including a plurality of sense electrodes, the circuit being adapted to measure variations in the instantaneous electric capacity of the sense electrodes in response to proximity to conductive bodies, wherein the sense electrodes are biased at a fixed voltage relative to a common floating reference potential, the measuring circuit comprising:

  • a power management circuit comprising a voltage source generating a modulation voltage that determines said floating reference potential, one or more readout units, each connected to a plurality of sense electrodes and operatively arranged for generating signals representing the instantaneous electric capacity of sense electrodes;

    a means for varying the frequency of the modulated voltage source;

    synchronous detection means for generating said signals synchronously with the modulation voltage.

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