Apparatus for compensating digital to analog converter errors
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United States of America Patent
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Oct 4, 1988
Issued Date -
N/A
app pub date -
Jul 13, 1987
filing date -
Nov 7, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A high precision analog to digital converter comprises the combination of an imperfect or low resolution digital to analog converter having an error function known in terms of orthonormal components and an error compensating device capable of generating correction terms which do not interact with one another. The correction terms are based on orthonormal components namely, the Walsh function components, of each signal level to be compensated. At most only one weighting value per bit is required, the combination of which will compensate for errors of any bit combination. In a specific embodiment employing feedback compensation, the output of the low resolution converter and of the compensating device may be summed to produce a high performance, high precision converter with increased accuracy and resolution.
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