Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
November 9, 2010
Patent Application Number
12027838
Date Filed
February 7, 2008
Patent Primary Examiner
Patent abstract
Capacitance measuring circuits and methods apply electrical charge pulses to ramp voltage signals across a voltage threshold, and use the number of pulses to determine the capacitance. Capacitances at multiple locations can be measured by storing a pulse counter value in a register associated with each voltage signal channel as that voltage signal crosses the threshold. Effects of electrode resistance on the capacitance measurements can be mitigated by using charge pulses to ramp the voltage signals and waiting for signal quiescence between pulses.
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