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Capacitive discharge circuit for touch sensitive screen

  • US 9,772,726 B2
  • Filed: 11/03/2014
  • Issued: 09/26/2017
  • Est. Priority Date: 11/03/2014
  • Status: Active Grant
First Claim
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1. A capacitive discharge circuit comprising:

  • a line having a capacitance associated therewith;

    a switched capacitor circuit comprising a capacitor;

    a switched circuit coupled to the line;

    a voltage regulator circuit coupled between the switched capacitor circuit and the switched circuit; and

    a controller configured to operate the switched capacitor circuit and the switched circuit so as to;

    in a first phase, charge the capacitor by coupling the capacitor between a common mode node and a power supply node,in a second phase, discharge the capacitor by coupling the voltage regulator circuit in series with the capacitor between the power supply node and a ground node,in a third phase, charge the capacitor by coupling the capacitor between the common mode node and the power supply node, andin a fourth phase, share charge between the line and the capacitor by coupling the voltage regulator circuit and the capacitor in series between the line and the ground node.

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