A Compact Energy Efficient CMOS Permittivity Sensor Based on Multiharmonic Downconversion and Tunable Impedance Bridge

G. Vlachogiannakis, Z. Hu, H. Thippur Shivamurty, A. Neto, M.A.P. Pertijs, L.C.N. de Vreede, M. Spirito

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

2 Citations (Scopus)

Abstract

This paper presents a 0.15×0.3 mm2 complex permittivity sensor integrated in a 40-nm CMOS node. A single-ended patch, employed as a near-field sensing element, is integrated with a double-balanced, fully-differential tunable impedance bridge that is driven by a square RF pulse. The multi-harmonic, interme-diate-frequency down-conversion architecture achieves a compact form factor and fast multi-frequency readout. Measurement results show good agreement with theoretical values and the measured relative permittivity variation remains below 0.3 over a 0.1-10 GHz range at a 1-ms measurement time. The energy efficiency resulting from the fast measurement time and the record-small active area allows integration in battery-operated wearables.

Original languageEnglish
Title of host publication2018 IEEE International Microwave Biomedical Conference (IMBioC)
PublisherIEEE
Pages1-3
Number of pages3
ISBN (Electronic)978-1-5386-5918-2
ISBN (Print)978-1-5386-5919-9
DOIs
Publication statusPublished - 2018
Event2018 IEEE/MTT-S International Microwave Biomedical Conference, IMBioc 2018 - Philadelphia, United States
Duration: 14 Jun 201815 Jun 2018

Conference

Conference2018 IEEE/MTT-S International Microwave Biomedical Conference, IMBioc 2018
Country/TerritoryUnited States
CityPhiladelphia
Period14/06/1815/06/18

Keywords

  • Bridge circuits
  • Chemical and biological sensors
  • Microwave sensors
  • Near field
  • Permittivity
  • Sensitivity
  • Wearable sensors

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