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Capacitance measurement circuit with dynamic feedback

  • US 8,174,273 B2
  • Filed: 01/07/2010
  • Issued: 05/08/2012
  • Est. Priority Date: 01/07/2010
  • Status: Active Grant
First Claim
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1. A method of measuring a capacitance, comprising:

  • building up charge on a first accumulator over a plurality of switch-controlled charging or discharging cycles governed by a first control signal;

    partially discharging the first accumulator as a function of a second control signal, optionally using a variable current device;

    monitoring an accumulator signal that is based on the charge on the first accumulator;

    dynamically adjusting one of the first and second control signals so as to keep the accumulator signal in a desired range; and

    using the dynamically adjusted control signal as a measure of the capacitance.

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