Cross-path phase calibration for high dynamic range data acquisition
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United States of America Patent
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May 17, 2016
Grant Date -
Mar 5, 2015
app pub date -
Oct 18, 2013
filing date -
Aug 27, 2013
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Abstract
In a data acquisition instrument with dual A/D converters in each measurement channel, phase corrections between the paths are computed using a locally generated calibration signal. The calibration signal goes through dual paths simultaneously and is stitched into a single signal for analysis by a processor running a Fourier transform where phase differences are easily identified and used to establish a phase correction signal applied to a single master clock supplying clock signals to both paths. A switch allows the calibration signal to be applied to each channel or to no channels when actual data is being collected.
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