Multipath Wide-Bandwidth CMOS Magnetic Sensors

Junfeng Jiang, Kofi AA Makinwa

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)
39 Downloads (Pure)

Abstract

This paper proposes a multipath multisensor architecture for CMOS magnetic sensors, which effectively extends their bandwidth without compromising either their offset or resolution. Two designs utilizing the proposed architecture were fabricated in a 0.18-μm standard CMOS process. In the first, the combination of spinning-current Hall sensors and nonspun Hall sensors achieves an offset of 40 μT and a resolution of 272 μTrms in a bandwidth of 400 kHz, which is 40 times more than previous low-offset CMOS Hall sensors. In the second, the combination of spinning-current Hall sensors and pickup coils achieves the same offset, with a resolution of 210 μTrms in a further extended bandwidth of 3 MHz, which is the widest bandwidth ever reported for a CMOS magnetic sensor.
Original languageEnglish
Pages (from-to)198-209
Number of pages12
JournalIEEE Journal of Solid State Circuits
Volume52
Issue number1
DOIs
Publication statusPublished - 2017

Keywords

  • ripple reduction loop (RRL)
  • CMOS
  • Hall sensor
  • magnetic sensor
  • multipath
  • pickup coil

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