Correction of static errors in an a/d-converter

Abstract From the Canadian patent

An analog-to-digital converter (ADC) has a histogram based correction of static errors. In a control and calculating unit (23) of the converter thus the counts of uncorrected digital output codes are stored in a memory (51). From the stored counts a model distribution is determined in a calculation unit, e.g. by estimating an expected gaussian distribution. The model distribution is compared to the measured counts and relative errors of the counts are calculated, the relative errors indicating errors in coarse reference levels. The errors are used for calculating correction terms (L(A)) stored in a correction table (47). The correction terms are used by an output calculating unit …