A hybrid multi-path CMOS magnetic sensor with 76 ppm/°C sensitivity driftA Hybrid Multi-Path CMOS Magnetic Sensorwith 76 ppm/˚C Sensitivity Drift

J. Jiang, K.A.A. Makinwa

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

Abstract

This paper presents a temperature-stable system for wide-bandwidth contactless current sensing. It employs a multipath combination of Hall sensors (low frequencies) and coils (high frequencies) to sense the magnetic field produced by a current-carrying conductor under a chip. To cancel the effect of earth's common-mode field, a differential sensing arrangement is used. This is further exploited to stabilize the Hall sensor's temperature drift with the help of a self-generated AC commonmode field. In a test chip fabricated in a 0.18 μm CMOS process, the stabilization scheme reduces the Hall sensor's sensitivity drift from 22% to 1% from -45°C to 105°C, corresponding to a temperature coefficient of 76 ppm/°C. The complete system has a bandwidth of 3 MHz, which represents a 10x improvement on previous low-drift CMOS magnetic sensors.
Original languageEnglish
Title of host publicationESSCIRC Conference 2016
Subtitle of host publication42nd European Solid-State Circuits Conference
PublisherIEEE
Pages397-400
Number of pages4
ISBN (Electronic)978-1-5090-2972-3
DOIs
Publication statusPublished - 20 Oct 2016
EventESSDERC-ESSCIRC 2016: 42nd European Solid-State Circuits Conference - Lausanne, Switzerland
Duration: 12 Sep 201615 Sep 2016
Conference number: 42
http://esscirc-essderc2016.epfl.ch/

Conference

ConferenceESSDERC-ESSCIRC 2016
Abbreviated titleESSDERC-ESSCIRC
CountrySwitzerland
CityLausanne
Period12/09/1615/09/16
Internet address

Keywords

  • Magnetic sensors
  • Temperature sensors
  • Sensivity
  • Coils
  • Temperature measurement
  • Spinning

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