A 0.1nW-1μW all-dynamic capacitance-to-digital converter with power/speed/capacitance scalability

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Abstract

A versatile, low power and energy efficient Capacitance-to-Digital Converter (CDC) for Internet-of-Things (IoT) is presented, based on an all-dynamic architecture with adaptable speed, resolution and range. Sampling rates from 1S/s up to 100kS/s are supported and capacitances from 1.23 to 24.59pF can be digitized while the power scales inherently from 0.1nW to 1μW. This makes the design versatile to efficiently deal with a variety of sensors with different speed requirements and different capacitance values. The 0.1nW lowest absolute power is >20x smaller than prior-art, and the Figure-of-Merit (FoM) from 18 to 59fJ/conv-step is also the lowest among prior designs. As example, by connecting a MEMS pressure sensor, this chip can measure environmental pressure with only 0.8nW at a speed of 100S/s.

Original languageEnglish
Title of host publicationESSCIRC 2018 - IEEE 44th European Solid State Circuits Conference
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Pages118-121
Number of pages4
ISBN (Electronic)9781538654040
DOIs
Publication statusPublished - 16 Oct 2018
Event44th IEEE European Solid State Circuits Conference, ESSCIRC 2018 - Dresden, Germany
Duration: 3 Sep 20186 Sep 2018

Conference

Conference44th IEEE European Solid State Circuits Conference, ESSCIRC 2018
Abbreviated titleESSCIRC 2018
CountryGermany
CityDresden
Period3/09/186/09/18

Keywords

  • CDC
  • dynamic
  • IoT
  • SAR ADC
  • versatile

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