MODELLING OF INSTRUMENTATION SIGMA-DELTA ANALOG-TO-DIGITAL CONVERTERS

Valeriy I. Didenko, Andrey L. Movchan, Juriy S. Solodov

Abstract

The paper examines a behavioral model of sigma-delta analog-to-digital converters (SDADC) which allows the uncertainty of A/D conversion to be evaluated. The most sources of the uncertainty are represented in data sheets of modern SDADC. However, information given by manufacturers now is not enough to evaluate the conversion uncertainty with given probability. The most critical situation takes place for noise of SDADC − the major source of the uncertainty in many cases. This problem is mainly discussed in the paper. Conditions for evaluation of the conversion uncertainty with given probability are found from theoretical analysis, simulation of a typical SDADC electronic model and experimental data. Some propositions for including corresponding parameters and tests into standards are made.

Keywords

sigma-delta ADC, quantization error, conversion uncertainty

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IMEKO-IWADC-2003-19.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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