Multipath Wide-Bandwidth CMOS Magnetic Sensors

Journal article (2017)

Authors

J. Jiang Electronic Instrumentation -

K.A.A. Makinwa Microelectronics

Kofi A.A. Makinwa Microelectronics

Research Group

Electronic Instrumentation () (TU Delft)

DOI: https://doi.org/10.1109/JSSC.2016.2619711

Multipath CMOS Hall sensor Ripple reduction loop (RRL) Magnetic sensor Pickup coil

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Published Date

2017

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

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.

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