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A Coupled Inductive Bridge for Magnetic Sensing Applications

Gal-Katziri, Matan and Hajimiri, Ali (2018) A Coupled Inductive Bridge for Magnetic Sensing Applications. In: IEEE 44th European Solid State Circuits Conference. IEEE , Piscataway, NJ, pp. 342-345. ISBN 978-1-5386-5404-0.

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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.

Item Type:Book Section
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Additional Information:© 2018 IEEE. The author would like to thank Dr. B. Abiri for technical discussions and Garret Sullivan for his assistance with testing.
Subject Keywords:CMOS integrated circuits, magnetic sensors, bridge circuits, inductive transducers, biosensors
Record Number:CaltechAUTHORS:20181025-114426172
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Official Citation:M. Gal-Katziri and A. Hajimiri, "A Coupled Inductive Bridge for Magnetic Sensing Applications," ESSCIRC 2018 - IEEE 44th European Solid State Circuits Conference (ESSCIRC), Dresden, Germany, 2018, pp. 342-345. doi: 10.1109/ESSCIRC.2018.8494313
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90419
Deposited By: Tony Diaz
Deposited On:25 Oct 2018 20:20
Last Modified:03 Oct 2019 20:25

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