A Precision, Energy-Efficient, Oversampling, Noise-Shaping Differential SAR Capacitance-to-Digital Converter

dc.contributor.authorAlhoshany, Abdulaziz
dc.contributor.authorSalama, Khaled N.
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
dc.contributor.departmentElectrical Engineering Program
dc.contributor.institutionDepartment of Electrical Engineering, Qassim University, Al-Malida 52571, Saudi Arabia
dc.date.accessioned2018-12-31T13:15:06Z
dc.date.available2018-12-31T13:15:06Z
dc.date.issued2018-06-25
dc.date.published-online2018-06-25
dc.date.published-print2019-02
dc.description.abstractThis paper introduces an oversampling, noise-shaping differential successive-approximation-register capacitance-to-digital converter (CDC) architecture for inter-facing capacitive sensors. The proposed energy-efficient CDC achieves high-precision capacitive resolution by employing oversampling and noise shaping. The switched-capacitor (SC) integrator is inserted between the comparator and the charge-redistribution digital-to-analog converter to implement noise shaping and to make the interface circuit insensitive to parasitic capacitances. An inverter-based operational transconductance amplifier with a common-mode feedback circuit is employed to implement the SC integrator with subthreshold biasing for low voltage and low power. The ring-oscillator-based comparator is implemented to achieve high energy efficiency. The test chip is fabricated in a 0.18-μm CMOS technology. The proposed CDC experimentally achieves 150 aF absolute resolution and 12.74-ENOB with an oversampling ratio of 15 and a sampling clock of 18.51 kHz. The fabricated prototype dissipates 1.2 and 0.39 μW from analog and digital supplies, respectively, with an energy efficiency figure-of-merit of 187 fJ/conversion step.
dc.description.sponsorshipThis work was supported by the King Abdullah University of Science and Technology. The Associate Editor coordinating the review process was Niclas Bjorsell.
dc.identifier.citationAlhoshany A, Salama KN (2018) A Precision, Energy-Efficient, Oversampling, Noise-Shaping Differential SAR Capacitance-to-Digital Converter. IEEE Transactions on Instrumentation and Measurement: 1–10. Available: http://dx.doi.org/10.1109/tim.2018.2844899.
dc.identifier.doi10.1109/tim.2018.2844899
dc.identifier.issn0018-9456
dc.identifier.issn1557-9662
dc.identifier.journalIEEE Transactions on Instrumentation and Measurement
dc.identifier.urihttp://hdl.handle.net/10754/630442
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)
dc.relation.urlhttps://ieeexplore.ieee.org/document/8395284/
dc.subjectCapacitance-to-digital converter (CDC)
dc.subjectcapacitive sensor interface circuit
dc.subjectCMOS
dc.subjectenergy efficient
dc.subjecthigh-precision capacitive resolution
dc.subjectsuccessive approximation (SAR).
dc.titleA Precision, Energy-Efficient, Oversampling, Noise-Shaping Differential SAR Capacitance-to-Digital Converter
dc.typeArticle
display.details.left<span><h5>Type</h5>Article<br><br><h5>Authors</h5><a href="https://repository.kaust.edu.sa/search?query=orcid.id:0000-0002-1976-2545&spc.sf=dc.date.issued&spc.sd=DESC">Alhoshany, Abdulaziz</a> <a href="https://orcid.org/0000-0002-1976-2545" target="_blank"><img src="https://repository.kaust.edu.sa/server/api/core/bitstreams/82a625b4-ed4b-40c8-865a-d6a5225a26a4/content" width="16" height="16"/></a><br><a href="https://repository.kaust.edu.sa/search?query=orcid.id:0000-0001-7742-1282&spc.sf=dc.date.issued&spc.sd=DESC">Salama, Khaled N.</a> <a href="https://orcid.org/0000-0001-7742-1282" target="_blank"><img src="https://repository.kaust.edu.sa/server/api/core/bitstreams/82a625b4-ed4b-40c8-865a-d6a5225a26a4/content" width="16" height="16"/></a><br><br><h5>KAUST Department</h5><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.department=Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division,equals">Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division</a><br><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.department=Electrical Engineering Program,equals">Electrical Engineering Program</a><br><br><h5>Online Publication Date</h5>2018-06-25<br><br><h5>Print Publication Date</h5>2019-02<br><br><h5>Date</h5>2018-06-25</span>
display.details.right<span><h5>Abstract</h5>This paper introduces an oversampling, noise-shaping differential successive-approximation-register capacitance-to-digital converter (CDC) architecture for inter-facing capacitive sensors. The proposed energy-efficient CDC achieves high-precision capacitive resolution by employing oversampling and noise shaping. The switched-capacitor (SC) integrator is inserted between the comparator and the charge-redistribution digital-to-analog converter to implement noise shaping and to make the interface circuit insensitive to parasitic capacitances. An inverter-based operational transconductance amplifier with a common-mode feedback circuit is employed to implement the SC integrator with subthreshold biasing for low voltage and low power. The ring-oscillator-based comparator is implemented to achieve high energy efficiency. The test chip is fabricated in a 0.18-μm CMOS technology. The proposed CDC experimentally achieves 150 aF absolute resolution and 12.74-ENOB with an oversampling ratio of 15 and a sampling clock of 18.51 kHz. The fabricated prototype dissipates 1.2 and 0.39 μW from analog and digital supplies, respectively, with an energy efficiency figure-of-merit of 187 fJ/conversion step.<br><br><h5>Citation</h5>Alhoshany A, Salama KN (2018) A Precision, Energy-Efficient, Oversampling, Noise-Shaping Differential SAR Capacitance-to-Digital Converter. IEEE Transactions on Instrumentation and Measurement: 1–10. Available: http://dx.doi.org/10.1109/tim.2018.2844899.<br><br><h5>Acknowledgements</h5>This work was supported by the King Abdullah University of Science and Technology. The Associate Editor coordinating the review process was Niclas Bjorsell.<br><br><h5>Publisher</h5><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.publisher=Institute of Electrical and Electronics Engineers (IEEE),equals">Institute of Electrical and Electronics Engineers (IEEE)</a><br><br><h5>Journal</h5><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.journal=IEEE Transactions on Instrumentation and Measurement,equals">IEEE Transactions on Instrumentation and Measurement</a><br><br><h5>DOI</h5><a href="https://doi.org/10.1109/tim.2018.2844899">10.1109/tim.2018.2844899</a><br><br><h5>Additional Links</h5>https://ieeexplore.ieee.org/document/8395284/</span>
kaust.personSalama, Khaled N.
orcid.authorAlhoshany, Abdulaziz::0000-0002-1976-2545
orcid.authorSalama, Khaled N.::0000-0001-7742-1282
orcid.id0000-0001-7742-1282
orcid.id0000-0002-1976-2545
Files