Method and apparatus for evaluating weighting of elements of DAC and SAR ADC using the same
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United States of America Patent
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Aug 6, 2013
Grant Date -
May 9, 2013
app pub date -
Dec 27, 2011
filing date -
Nov 4, 2011
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Abstract
A method and an apparatus for evaluating weighting of elements of a DAC and a SAR ADC using the same are provided. An equivalent weighting of each composed element is obtained by adding a reference element with a reference weighting, an auxiliary DAC, and a search circuit into the SAR ADC, and the equivalent weighting is represented by the reference weighting. The SAR ADC can calculate and then obtain a correct digital output by using the calibrated equivalent weighting and the successive approximation result of each input signal. The present disclosure prevents the necessity of matching each composed element of the DAC in the SAR ADC.
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