SAR ADC Algorithm with Redundancy and Digital Error Correction

Tomohiko OGAWA  Haruo KOBAYASHI  Yosuke TAKAHASHI  Nobukazu TAKAI  Masao HOTTA  Hao SAN  Tatsuji MATSUURA  Akira ABE  Katsuyoshi YAGI  Toshihiko MORI  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E93-A   No.2   pp.415-423
Publication Date: 2010/02/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E93.A.415
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
SAR ADC,  digital error correction,  non-binary,  redundancy,  

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Summary: 
This paper describes an algorithm for Successive Approximation Register (SAR) ADCs with overlapping steps that allow comparison decision errors (due to, such as DAC incomplete settling) to be digitally corrected. We generalize this non-binary search algorithm, and clarify which decision errors it can digitally correct. This algorithm requires more SAR ADC conversion steps than a binary search algorithm, but we show that the sampling speed of an SAR ADC using this algorithm can be faster than that of a conventional binary-search SAR ADC -- because the latter must wait for the settling time of the DAC inside the SAR ADC.