A Coupled Inductive Bridge for Magnetic Sensing Applications

Matan Gal-Katziri; Ali Hajimiri

doi:10.1109/ESSCIRC.2018.8494313

A Coupled Inductive Bridge for Magnetic Sensing Applications

Matan Gal-Katziri, Ali Hajimiri

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

3 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 language	English
Title of host publication	ESSCIRC 2018 - IEEE 44th European Solid State Circuits Conference
Publisher	Institute of Electrical and Electronics Engineers
Pages	322-325
Number of pages	4
ISBN (Electronic)	9781538654040
DOIs	https://doi.org/10.1109/ESSCIRC.2018.8494313
State	Published - 16 Oct 2018
Externally published	Yes
Event	44th IEEE European Solid State Circuits Conference, ESSCIRC 2018 - Dresden, Germany Duration: 3 Sep 2018 → 6 Sep 2018

Publication series

Name	ESSCIRC 2018 - IEEE 44th European Solid State Circuits Conference

Conference

Conference	44th IEEE European Solid State Circuits Conference, ESSCIRC 2018
Country/Territory	Germany
City	Dresden
Period	3/09/18 → 6/09/18

Keywords

CMOS integrated circuits
biosensors
bridge circuits
inductive transducers
magnetic sensors

ASJC Scopus subject areas

Electrical and Electronic Engineering
Instrumentation

Access to Document

10.1109/ESSCIRC.2018.8494313

Cite this

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title = "A Coupled Inductive Bridge for Magnetic Sensing Applications",

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.",

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author = "Matan Gal-Katziri and Ali Hajimiri",

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Gal-Katziri, M & Hajimiri, A 2018, A Coupled Inductive Bridge for Magnetic Sensing Applications. in ESSCIRC 2018 - IEEE 44th European Solid State Circuits Conference., 8494313, ESSCIRC 2018 - IEEE 44th European Solid State Circuits Conference, Institute of Electrical and Electronics Engineers, pp. 322-325, 44th IEEE European Solid State Circuits Conference, ESSCIRC 2018, Dresden, Germany, 3/09/18. https://doi.org/10.1109/ESSCIRC.2018.8494313

A Coupled Inductive Bridge for Magnetic Sensing Applications. / Gal-Katziri, Matan; Hajimiri, Ali.
ESSCIRC 2018 - IEEE 44th European Solid State Circuits Conference. Institute of Electrical and Electronics Engineers, 2018. p. 322-325 8494313 (ESSCIRC 2018 - IEEE 44th European Solid State Circuits Conference).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Hajimiri, Ali

PY - 2018/10/16

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N2 - 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.

AB - 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.

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KW - inductive transducers

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A Coupled Inductive Bridge for Magnetic Sensing Applications

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Publication series

Conference

Keywords

ASJC Scopus subject areas

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