Analysis and Calibration of Nonbinary-Weighted Capacitive DAC for High-Resolution SAR ADCs
2014 (English)In: IEEE Transactions on Circuits and Systems - II - Express Briefs, ISSN 1549-7747, Vol. 61, no 9, 666-670 p.Article in journal (Refereed) Published
This brief analyzes the effect of capacitor variation on the design of high-resolution nonbinary-weighted successive-approximation-register analog-to-digital converters in terms of radix, conversion steps, and accuracy. Moreover, the limitation caused by the one-side redundancy of the nonbinary-weighted network is addressed and a corresponding solution with a mathematical derivation is provided. In order to relax the mismatch requirement on the capacitor sizing while still ensuring enough linearity, a bottom-up weight calibration technique accounting for noise and offset errors is proposed, and its effectiveness is demonstrated. This calibration approach can be easily incorporated into a charge-redistribution converter without modifying its main architecture and conversion sequence.
Place, publisher, year, edition, pages
IEEE , 2014. Vol. 61, no 9, 666-670 p.
Capacitor variation; digital error correction; nonbinary weighted; redundancy; successive approximation; successive approximation register (SAR) analog-to-digital converters (ADCs); weight calibration
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:liu:diva-110385DOI: 10.1109/TCSII.2014.2331111ISI: 000341985600006OAI: oai:DiVA.org:liu-110385DiVA: diva2:745224