A Coupled Inductive Bridge for Magnetic Sensing Applications

Matan Gal-Katziri, Ali Hajimiri

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

A highly-sensitive magnetic sensor with excellent long-term stability is presented. We modify a conventional all-inductor AC Wheatstone Bridge by coupling two inductor pairs in a cross-coupled configuration which halves its size and doubles its sensitivity, while maintaining a fully differential output that reduces common-mode induced offset and drift. The sensor was fabricated with integrated excitation and receiver circuitry in a 65nm bulk CMOS process. It operates between 770MHz and 1.45GHz, has an effective sensing area of 200μm × 200μm, and reliably and continuously detects single 4.5μm magnetic label beads without significant drift over time periods notably longer than previously reported works. To our best knowledge, this is the first demonstration of a magnetic sensor using a fully symmetric, gain enhanced, and all-inductor coupled bridge circuit.

Original languageEnglish
Title of host publicationESSCIRC 2018 - IEEE 44th European Solid State Circuits Conference
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages322-325
Number of pages4
ISBN (Electronic)9781538654040
DOIs
StatePublished - 16 Oct 2018
Externally publishedYes
Event44th IEEE European Solid State Circuits Conference, ESSCIRC 2018 - Dresden, Germany
Duration: 3 Sep 20186 Sep 2018

Publication series

NameESSCIRC 2018 - IEEE 44th European Solid State Circuits Conference

Conference

Conference44th IEEE European Solid State Circuits Conference, ESSCIRC 2018
Country/TerritoryGermany
CityDresden
Period3/09/186/09/18

Keywords

  • CMOS integrated circuits
  • biosensors
  • bridge circuits
  • inductive transducers
  • magnetic sensors

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