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Missing-Code-occurrence probability calibration technique for DAC nonlinearity with supply and reference circuit analysis in a SAR ADC
Wang G.1; Li C.1; Zhu Y.1; Zhong J.1; Lu Y.1; Chan C.-H.1; Martins R.P.1
2018-11-01
Source PublicationIEEE Transactions on Circuits and Systems I: Regular Papers
ISSN15498328
Volume65Issue:11Pages:3707-3719
AbstractThis paper reports a calibration scheme that can be used to correct the inter-stage gain error in two-stage analog-to-digital converters (ADCs). We measure the static nonlinearity at the raw ADC outputs and compensate it through a feedback path to adjust the gain in the analog domain, which avoids the dynamic range loss in the conventional pure digital calibrations. The proposed scheme detects the error via the missing-code-occurrence probability (MCOP), which is insensitive to the comparator offset and has better immunity to its noise. Besides the gain error, we discuss other DAC linearity issues, such as the implementations of the reference buffer and the low-dropout (LDO) regulator. To verify the MCOP calibration, we design a 12-bit successive-approximation-register ADC, employing the bridge-DAC, in 65-nm CMOS. We integrate the ADC operating at 100 MS/s with the MCOP calibration, the reference buffers, and the LDO. The measurement results demonstrate the linearity enhancement after the proposed calibration, where we improve the signal-to-noise-and-distortion ratio to 61.38 dB, leading to a FoM of 16.7 fJ/conversion step at the Nyquist input frequency.
Keywordbridge DAC Gain error calibration low-dropout (LDO) regulator SAR ADC testing signal generation
DOI10.1109/TCSI.2018.2858848
URLView the original
Language英語
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Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.Universidade de Macau
2.Instituto Superior Técnico
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Wang G.,Li C.,Zhu Y.,et al. Missing-Code-occurrence probability calibration technique for DAC nonlinearity with supply and reference circuit analysis in a SAR ADC[J]. IEEE Transactions on Circuits and Systems I: Regular Papers,2018,65(11):3707-3719.
APA Wang G..,Li C..,Zhu Y..,Zhong J..,Lu Y..,...&Martins R.P..(2018).Missing-Code-occurrence probability calibration technique for DAC nonlinearity with supply and reference circuit analysis in a SAR ADC.IEEE Transactions on Circuits and Systems I: Regular Papers,65(11),3707-3719.
MLA Wang G.,et al."Missing-Code-occurrence probability calibration technique for DAC nonlinearity with supply and reference circuit analysis in a SAR ADC".IEEE Transactions on Circuits and Systems I: Regular Papers 65.11(2018):3707-3719.
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