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  • Research Article
  • Open Access

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

  • 1Email author,
  • 1 and
  • 1
EURASIP Journal on Advances in Signal Processing20072008:453218

  • Received: 30 April 2007
  • Accepted: 28 October 2007
  • Published:


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.


  • Statistical Estimation
  • Random Sequence
  • Calibration Procedure
  • Full Article
  • Error Parameter

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Authors’ Affiliations

Dipartimento di Ingegneria Elettronica, Università di Roma La Sapienza, Via Eudossiana 18, Roma, 00184, Italy