Multipath Wide-Bandwidth CMOS Magnetic Sensors

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...

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Bibliographic Details
Published inIEEE journal of solid-state circuits Vol. 52; no. 1; pp. 198 - 209
Main Authors Junfeng Jiang, Makinwa, Kofi A. A.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.01.2017
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Bandwidth
Bandwidths
CMOS
Coils
Hall sensor
magnetic sensor
Magnetic sensors
multipath
pickup coil
ripple reduction loop (RRL)
Sensitivity
Sensor systems
Spinning
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Summary: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 μT rms 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 μT rms in a further extended bandwidth of 3 MHz, which is the widest bandwidth ever reported for a CMOS magnetic sensor.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2016.2619711