A 45.8fJ/Step, energy-efficient, differential SAR capacitance-to-digital converter for capacitive pressure sensing

Handle URI:
http://hdl.handle.net/10754/621485
Title:
A 45.8fJ/Step, energy-efficient, differential SAR capacitance-to-digital converter for capacitive pressure sensing
Authors:
Alhoshany, Abdulaziz; Omran, Hesham ( 0000-0002-0117-7364 ) ; Salama, Khaled N. ( 0000-0001-7742-1282 )
Abstract:
An energy-efficient readout circuit for a capacitive sensor is presented. The capacitive sensor is digitized by a 12-bit energy efficient capacitance-to-digital converter (CDC) that is based on a differential successive-approximation architecture. This CDC meets extremely low power requirements by using an operational transconductance amplifier (OTA) that is based on a current-starved inverter. It uses a charge-redistribution DAC that involves coarse-fine architecture. We split the DAC into a coarse-DAC and a fine-DAC to allow a wide capacitance range in a compact area. It covers a wide range of capacitance of 16.14 pF with a 4.5 fF absolute resolution. An analog comparator is implemented by cross-coupling two 3-input NAND gates to enable power and area efficient operation. The prototype CDC was fabricated using a standard 180 nm CMOS technology. The 12-bit CDC has a measurement time of 42.5 μs, and consumes 3.54 μW and 0.29 μW from analog and digital supplies, respectively. This corresponds to a state-of-the-art figure-of-merit (FoM) of 45.8 fJ/conversion-step. © 2016 Elsevier B.V. All rights reserved.
KAUST Department:
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Citation:
Alhoshany A, Omran H, Salama KN (2016) A 45.8fJ/Step, energy-efficient, differential SAR capacitance-to-digital converter for capacitive pressure sensing. Sensors and Actuators A: Physical 245: 10–18. Available: http://dx.doi.org/10.1016/j.sna.2016.04.038.
Publisher:
Elsevier BV
Journal:
Sensors and Actuators A: Physical
Issue Date:
3-May-2016
DOI:
10.1016/j.sna.2016.04.038
Type:
Article
ISSN:
0924-4247
Sponsors:
The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).
Appears in Collections:
Articles; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorAlhoshany, Abdulazizen
dc.contributor.authorOmran, Heshamen
dc.contributor.authorSalama, Khaled N.en
dc.date.accessioned2016-11-03T08:30:31Z-
dc.date.available2016-11-03T08:30:31Z-
dc.date.issued2016-05-03en
dc.identifier.citationAlhoshany A, Omran H, Salama KN (2016) A 45.8fJ/Step, energy-efficient, differential SAR capacitance-to-digital converter for capacitive pressure sensing. Sensors and Actuators A: Physical 245: 10–18. Available: http://dx.doi.org/10.1016/j.sna.2016.04.038.en
dc.identifier.issn0924-4247en
dc.identifier.doi10.1016/j.sna.2016.04.038en
dc.identifier.urihttp://hdl.handle.net/10754/621485-
dc.description.abstractAn energy-efficient readout circuit for a capacitive sensor is presented. The capacitive sensor is digitized by a 12-bit energy efficient capacitance-to-digital converter (CDC) that is based on a differential successive-approximation architecture. This CDC meets extremely low power requirements by using an operational transconductance amplifier (OTA) that is based on a current-starved inverter. It uses a charge-redistribution DAC that involves coarse-fine architecture. We split the DAC into a coarse-DAC and a fine-DAC to allow a wide capacitance range in a compact area. It covers a wide range of capacitance of 16.14 pF with a 4.5 fF absolute resolution. An analog comparator is implemented by cross-coupling two 3-input NAND gates to enable power and area efficient operation. The prototype CDC was fabricated using a standard 180 nm CMOS technology. The 12-bit CDC has a measurement time of 42.5 μs, and consumes 3.54 μW and 0.29 μW from analog and digital supplies, respectively. This corresponds to a state-of-the-art figure-of-merit (FoM) of 45.8 fJ/conversion-step. © 2016 Elsevier B.V. All rights reserved.en
dc.description.sponsorshipThe research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).en
dc.publisherElsevier BVen
dc.subjectCapacitance-to-digital converter (CDC)en
dc.subjectCapacitive sensor interfaceen
dc.subjectCMOSen
dc.subjectCurrent-starved inverteren
dc.subjectEnergy-efficienten
dc.titleA 45.8fJ/Step, energy-efficient, differential SAR capacitance-to-digital converter for capacitive pressure sensingen
dc.typeArticleen
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Divisionen
dc.identifier.journalSensors and Actuators A: Physicalen
kaust.authorAlhoshany, Abdulazizen
kaust.authorOmran, Heshamen
kaust.authorSalama, Khaled N.en
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.