Calibration technique for SAR analog-to-digital converters

Tao Tong, Wenhuan Yu, Pavan K. Hanumolu, Gabor C. Temes

Research output: Contribution to journalArticle

Abstract

A self-calibration technique was developed for SAR analog-to-digital converters that employ binary-weighted capacitors. High-accuracy calibration is achieved by finding and correcting the mismatch of each capacitor independently. The mismatch errors are extracted at power-up, and corrected by individual calibration DACs during the conversion. Unlike in previous schemes, in the proposed method the residual error in the calibration of a capacitor does not affect the calibration of any other capacitor. Simulation results show that the proposed method is also insensitive to the non-idealities of the calibration DACs.

Original languageEnglish (US)
Pages (from-to)301-309
Number of pages9
JournalAnalog Integrated Circuits and Signal Processing
Volume73
Issue number1
DOIs
StatePublished - Oct 1 2012
Externally publishedYes

Keywords

  • Analog-to-digital converters (ADCs)
  • Capacitor mismatch
  • Digital calibration
  • Successive-approximation converter (SAR ADC)

ASJC Scopus subject areas

  • Signal Processing
  • Hardware and Architecture
  • Surfaces, Coatings and Films

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