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MUTUAL CAPACITANCE MEASURING CIRCUITS AND METHODS

  • US 20100073323A1
  • Filed: 09/16/2009
  • Published: 03/25/2010
  • Est. Priority Date: 09/24/2008
  • Status: Active Grant
First Claim
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1. An apparatus for measuring a parameter related to capacitance between a drive electrode and a receive electrode of a touch sensitive device, the apparatus comprising:

  • an accumulator capacitor coupled at one end to a voltage measurement circuit and at the other end to the receive electrode;

    control circuitry configured and arranged, during each cycle of a measurement sequence, to connect a reference voltage to a first node that electrically connects the accumulator capacitor to the voltage measurement circuit; and

    a discharge circuit configured and arranged to draw current from a second node electrically connected to the accumulator capacitor and to the receive electrode during the measurement sequence.

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