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Open Access

A Simple Technique for Fast Digital Background Calibration of A/D Converters

  • Francesco Centurelli1Email author,
  • Pietro Monsurrò1 and
  • Alessandro Trifiletti1
EURASIP Journal on Advances in Signal Processing20072008:453218

https://doi.org/10.1155/2008/453218

Received: 30 April 2007

Accepted: 28 October 2007

Published: 15 November 2007

Abstract

A modification of the background digital calibration procedure for A/D converters by Li and Moon is proposed, based on a method to improve the speed of convergence and the accuracy of the calibration. The procedure exploits a colored random sequence in the calibration algorithm, and can be applied both for narrowband input signals and for baseband signals, with a slight penalty on the analog bandwidth of the converter. By improving the signal-to-calibration-noise ratio of the statistical estimation of the error parameters, our proposed technique can be employed either to improve linearity or to make the calibration procedure faster. A practical method to generate the random sequence with minimum overhead with respect to a simple PRBS is also presented. Simulations have been performed on a 14-bit pipeline A/D converter in which the first 4 stages have been calibrated, showing a 15 dB improvement in THD and SFDR for the same calibration time with respect to the original technique.

Keywords

Statistical EstimationRandom SequenceCalibration ProcedureFull ArticleError Parameter

Publisher note

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Authors’ Affiliations

(1)
Dipartimento di Ingegneria Elettronica, Università di Roma La Sapienza, Roma, Italy

Copyright

© Francesco Centurelli et al. 2008

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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