A Hybrid Multi-path CMOS Magnetic Sensor with 210µTrms Resolution and 3MHz Bandwidth for Contactless Current Sensing

J. Jiang, K.A.A. Makinwa

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

19 Citations (Scopus)

Abstract

CMOS Hall sensors are widely used as magnetic sensors due to their linearity and ease of integration [1-3]. Being essentially n-well resistors, their resolution is determined by thermal noise and so decreases with bandwidth (Fig. 11.3.1), limiting their use in wide-band current-sensing applications, such as in switched-mode power supplies, electric motor control and short-circuit detection. In contrast, the differentiating characteristic of pick-up coils means that their resolution actually improves with bandwidth (Fig. 11.3.1). This paper describes a hybrid sensor in standard CMOS that achieves wide bandwidth and good resolution by employing a Hall sensor in a low-frequency (LF) path and a coil in a high-frequency (HF) path. The sensors' outputs are amplified by two transconductance amplifiers (gm,coil and gm,HS) and then combined by a transimpedance amplifier (TIA) (Fig. 11.3.1). The sensor achieves a resolution of 210μTrms in a 3MHz bandwidth; the latter represents an order of magnitude improvement over state-of-the-art CMOS magnetic sensors [1,4].
Original languageEnglish
Title of host publication2016 IEEE International Solid-State Circuits Conference, ISSCC 2016
Subtitle of host publicationDigest of Technical Papers
EditorsLaura C. Fujino
Place of PublicationDanvers, MA
PublisherIEEE
Pages204-205
Number of pages2
ISBN (Electronic)978-1-4673-9467-3
ISBN (Print)978-1-4673-9466-6
DOIs
Publication statusPublished - 25 Feb 2016
Event2016 IEEE International Solid-State Circuits Conference, ISSCC 2016 - San Francisco, CA, United States
Duration: 31 Jan 20164 Feb 2016
http://isscc.org/index.html

Conference

Conference2016 IEEE International Solid-State Circuits Conference, ISSCC 2016
Abbreviated titleISSCC 2016
Country/TerritoryUnited States
CitySan Francisco, CA
Period31/01/164/02/16
Internet address

Keywords

  • Magnetic sensors
  • Bandwinth
  • CMOS integrated circuits
  • Coils
  • Sensor phenomena and characterization
  • Frequency response

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