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PULSED CAPACITANCE MEASURING CIRCUITS AND METHODS

  • US 20090167325A1
  • Filed: 02/07/2008
  • Published: 07/02/2009
  • Est. Priority Date: 12/28/2007
  • Status: Active Grant
First Claim
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1. For use in a device that measures capacitances at each of a plurality of locations by applying an electrical charge to ramp respective voltage signals associated with each of the locations, a method comprising:

  • incrementally ramping the respective voltage signals using a series of electrical charge pulses to charge each of the capacitances until each of the ramped voltage signals crosses a threshold voltage level, and for each pulse;

    incrementing a pulse count value and storing the pulse count value in registers associated with any of the voltage signals determined to have crossed the threshold voltage level after waiting for quiescence in the voltage signals; and

    determining the capacitances using the count values stored in the associated registers.

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