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 postcorrection of pipeline analog-digital converters (ADCs). An input-frequency-dependent INL model is developed for the compensation. The model consists of a static term that is dependent on the ADC output code, and a dynamic term that has an additional dependence on the input signal frequency. The INL model is subtracted from the digital output for postcorrection. The static compensation is implemented with a look-up-table. The dynamic calibration is performed by a bank of frequency domain filters using an overlap-add structure. Two ADCs of the same type (Analog Devices AD9430) are compensated for in the first three Nyquist bands. The performance improvements in terms of spurious-free dynamic range and intermodulation distortion 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:hig:diva-14914DOI: 10.1109/TIM.2013.2248289ISI: 000320129100002ScopusID: 2-s2.0-84879067552OAI: oai:DiVA.org:hig-14914DiVA: diva2:637489