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Capacitance measurement circuit and method

  • US 8,415,957 B2
  • Filed: 12/16/2009
  • Issued: 04/09/2013
  • Est. Priority Date: 07/02/2009
  • Status: Active Grant
First Claim
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1. A capacitance measuring method for measuring a capacitance of an under-test capacitor, the measuring method comprising:

  • pre-charging a storage capacitor;

    performing a charge transfer between the under-test capacitor and the storage capacitor;

    charging and discharging the storage capacitor, includingdischarging the storage capacitor when a voltage of the storage capacitor is higher than a reference voltage, andcharging the storage capacitor when the voltage of the storage capacitor is lower than the reference voltage; and

    measuring the capacitance of the under-test capacitor according to the voltage of the storage capacitor.

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