CORRECTION OF ADC ERRORS BY ITERATIVE METHOD WITH DITHERING USING DITHER WITH UNIFORM DISTRIBUTION

Miroslav Kamenský, Karol Kováč

Abstract

For automatic correction of measurement transducer error additive iterative method (AIM) could be used. But quantization error represents limitation for correction process in application for analog-to-digital converter. Combination of AIM with nonsubtractive dithering (ND) is proposed for this kind of application and the principle of combination of both techniques is described in the paper. AIM is based on precise inverse element (IE) which in our case consists of pulse width modulation output and low-pass filter. Technique similar to deterministic dithering is employed to achieve precise processing of signal from IE. Analysis of influence of dither with uniform distribution upon the results of correction is performed with the aim to find optimal parameters of ND. The optimal dispersion of dither is found leading to meaningful error correction. Finally dependency of root mean squared error on measured value is drawn to show how AIM improves accuracy.

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DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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