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A 65.5-dB SNDR 8.1-11.1-nW ECG SAR ADC with Adaptive-Latching OSC-Based Comparator and DAC Calibration
Li,Kejin1; Zhang,Wai Hong1; Chen,Yun2; Zhu,Yan1; Chan,Chi Hang1; Martins,Rui Paulo1
2020
Source PublicationIEEE Solid-State Circuits Letters
Volume3Pages:482-485
Abstract

This letter presents a 65-dB SNDR ECG SAR analog-to-digital converter (ADC) that utilizes a VCM-based LSB-first switching scheme for extraordinary low-power operation under low supply voltage. Unlike conventional VCO-based or OSC-based comparators which being either power inefficiency or low speed, the adaptive-latching OSC-based comparator is presented. It achieves low power while simultaneously maintaining an adequate speed under a low supply voltage through the adaptive latching scheme and asynchronous operations. The switching scheme incorporating the proposed comparator also facilitates the DAC mismatch calibration, where no additional analog hardware is necessary for the DAC mismatch detection. After calibration, the worst INL decreases from 2.6 LSBs to 0.85 LSB. The prototype, fabricated in 65-nm LP CMOS, attains 65.48-dB SNDR at 4 KS/s with an OSR = 4 while consuming only 8.1 nW at 0.55-V supply and leading to a 173.4-dB Schreier FoM.

KeywordCalibration Ecg Analog-to-digital Converter (Adc) Lsb-first Algorithm Osc-based Comparator
DOI10.1109/LSSC.2020.3025531
URLView the original
Indexed ByESCI
Language英語English
WOS Research AreaComputer Science ; Engineering
WOS SubjectComputer Science, Hardware & Architecture ; Engineering, Electrical & Electronic
WOS IDWOS:000723378200122
Scopus ID2-s2.0-85091689844
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Cited Times [WOS]:0   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionDEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
INSTITUTE OF MICROELECTRONICS
Corresponding AuthorChan,Chi Hang
Affiliation1.State-Key Laboratory of Analog and Mixed Signal VLSI,IME and DECE/FST,University of Macau,Macao
2.Fudan University,Shanghai,China
First Author AffilicationFaculty of Science and Technology
Corresponding Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
Li,Kejin,Zhang,Wai Hong,Chen,Yun,et al. A 65.5-dB SNDR 8.1-11.1-nW ECG SAR ADC with Adaptive-Latching OSC-Based Comparator and DAC Calibration[J]. IEEE Solid-State Circuits Letters,2020,3:482-485.
APA Li,Kejin,Zhang,Wai Hong,Chen,Yun,Zhu,Yan,Chan,Chi Hang,&Martins,Rui Paulo.(2020).A 65.5-dB SNDR 8.1-11.1-nW ECG SAR ADC with Adaptive-Latching OSC-Based Comparator and DAC Calibration.IEEE Solid-State Circuits Letters,3,482-485.
MLA Li,Kejin,et al."A 65.5-dB SNDR 8.1-11.1-nW ECG SAR ADC with Adaptive-Latching OSC-Based Comparator and DAC Calibration".IEEE Solid-State Circuits Letters 3(2020):482-485.
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