Dynamic Calibration of Undersampled Pipelined ADCs by Frequency Domain Filtering
2013 (English)In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, Vol. 62, no 7, 1882-1891 p.Article in journal (Refereed) Published
Integral nonlinearity (INL) is used for the post-correction of pipelineanalog-digital converters (ADC)s. An input-frequency-dependentINL model is developed for the compensation. The model consistsof a static term that is dependent on the ADC output code and adynamic term that has an additional dependence on the input signalfrequency. The INL model is subtracted from thedigital output for post-correction. The static compensationis implemented with a look-up-table (LUT). The dynamic calibration isperformed by a bank of frequency domain filters using an overlap-add structure.Two ADCs of the same type (Analog Devices AD9430) are compensated in the first three Nyquist bands.The performance improvements in terms of spurious-free dynamic range(SFDR) and intermodulation distortion (IMD) are investigated. Using the proposed method, improvements up to 17 dB are reported in favorable scenarios.
Place, publisher, year, edition, pages
2013. Vol. 62, no 7, 1882-1891 p.
IdentifiersURN: urn:nbn:se:kth:diva-105862DOI: 10.1109/TIM.2013.2248289ISI: 000320129100002ScopusID: 2-s2.0-84879067552OAI: oai:DiVA.org:kth-105862DiVA: diva2:572607
QC 201307122012-11-282012-11-282013-07-12Bibliographically approved