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11 September 2015 Difficulties with assessment of adaptive cyclic ADC nonlinearity
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Proceedings Volume 9662, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2015; 966240 (2015) https://doi.org/10.1117/12.2205903
Event: XXXVI Symposium on Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments (Wilga 2015), 2015, Wilga, Poland
Abstract
The paper discusses the possibility of application of nonlinearity measures – INL and DNL, as recommended in IEEE Std 1241, to adaptive cyclic ADC. The first difficulty confronted was not knowing the nominal transfer function of adaptive ADC. To overcome this difficulty, there was proposed an algorithm for its analytical determination on the basis of the models and parameters of the components of the analog part of the converter and of the codes computing algorithm. Using this tool, validated in simulation experiments, there was established a non-uniformity of the adaptive ADC nominal transfer function, concerning both thresholds and quantization levels. The latter is the second, unremovable obstacle to application of INL and DNL measures to characterization of adaptive ADC nonlinearity. In the paper, there are explained the causes of the non-uniformity and there is shown a possibility and conditions of realization of adaptive ADCs with uniform nominal transfer function. Finally, there are presented the results of simulation analysis of the influence of the established non-uniformity of nominal transfer function of adaptive ADC on THD - another popular measure of ADC nonlinearity recommended in IEEE Std 1241 - which show that the non-uniformity does not worsen THD compared with THD obtained for adaptive ADC with similar but uniform transfer function.
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Łukasz Małkiewicz and Konrad Jędrzejewski "Difficulties with assessment of adaptive cyclic ADC nonlinearity", Proc. SPIE 9662, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2015, 966240 (11 September 2015); https://doi.org/10.1117/12.2205903
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