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Circuits and methods for impedance determination using active measurement cancelation

  • US 9,519,031 B2
  • Filed: 12/16/2013
  • Issued: 12/13/2016
  • Est. Priority Date: 12/16/2013
  • Status: Active Grant
First Claim
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1. An impedance measurement circuit, comprising:

  • a signal creator configured to generate a delta signal and an opposite delta signal, which is substantially equal and opposite in amplitude to the delta signal, such that a sum of the delta signal and the opposite delta signal is substantially zero at any instant of time;

    a first application circuit configured to apply the delta signal across a first set of cells comprising one or more electrochemical cells of a plurality of electrochemical cells, wherein the plurality of electrochemical cells are operably coupled in series between a first end terminal and a second end terminal;

    a second application circuit configured to apply the opposite delta signal while the delta signal is being applied and across a second set of cells comprising one or more electrochemical cells of the plurality of electrochemical cells; and

    a measurement unit configured to measure a response signal across the second set of cells when the delta signal and the opposite delta signal are being applied;

    wherein the second set of cells is different from the first set of cells and there is substantially no change in current between the first end terminal and the second end terminal due to the application of the delta signal and the opposite delta signal.

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