Apparatus and method for impedance measurement
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United States of America Patent
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May 28, 2013
Grant Date -
May 26, 2011
app pub date -
Oct 22, 2010
filing date -
Oct 29, 2009
priority date (Note) -
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Abstract
A system is provided which includes a signal generator for generating a periodic excitation signal and an analog to digital converter, wherein the system is configured to apply the periodic excitation signal to a network including a known first impedance and a second impedance and to take a first set of M digital samples of a first signal relating to the first impedance and a second set of M digital samples of a second signal relating to the second impedance with a sampling frequency that is an integer multiple of the frequency of the periodic signal. The system is further configured to determine the impedance value of the second impedance by calculating a relative phase difference between the first signal and the second signal using the first set of digital samples and the second set of digital samples.
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