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Calibration technique for SAR analog-to-digital converters

TitleCalibration technique for SAR analog-to-digital converters
Publication TypeConference Paper
Year of Publication2012
AuthorsTong, T., W. Yu, P K. Hanumolu, and G. C. Temes
Conference Name2012 IEEE International Symposium on Circuits and Systems - ISCAS 2012
Pagination2993 - 2996
Date Published05/2012
Conference LocationSeoul, Korea (South)
ISBN Number978-1-4673-0217-3

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.