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

doi:10.1109/esscirc.2016.7598325

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

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-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 language	English
Title of host publication	ESSCIRC Conference 2016
Subtitle of host publication	42nd European Solid-State Circuits Conference
Publisher	IEEE
Pages	397-400
Number of pages	4
ISBN (Electronic)	978-1-5090-2972-3
DOIs	https://doi.org/10.1109/esscirc.2016.7598325
Publication status	Published - 20 Oct 2016
Event	ESSDERC-ESSCIRC 2016: 42nd European Solid-State Circuits Conference - Lausanne, Switzerland Duration: 12 Sep 2016 → 15 Sep 2016 Conference number: 42 http://esscirc-essderc2016.epfl.ch/

Conference

Conference	ESSDERC-ESSCIRC 2016
Abbreviated title	ESSDERC-ESSCIRC
Country/Territory	Switzerland
City	Lausanne
Period	12/09/16 → 15/09/16
Internet address	http://esscirc-essderc2016.epfl.ch/

Keywords

Magnetic sensors
Temperature sensors
Sensivity
Coils
Temperature measurement
Spinning

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10.1109/esscirc.2016.7598325

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

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.",

keywords = "Magnetic sensors, Temperature sensors, Sensivity, Coils, Temperature measurement, Spinning",

author = "J. Jiang and K.A.A. Makinwa",

year = "2016",

month = oct,

day = "20",

doi = "10.1109/esscirc.2016.7598325",

language = "English",

pages = "397--400",

booktitle = "ESSCIRC Conference 2016",

publisher = "IEEE ",

address = "United States",

note = "ESSDERC-ESSCIRC 2016 : 42nd European Solid-State Circuits Conference, ESSDERC-ESSCIRC ; Conference date: 12-09-2016 Through 15-09-2016",

url = "http://esscirc-essderc2016.epfl.ch/",

}

Jiang, J & Makinwa, KAA 2016, A hybrid multi-path CMOS magnetic sensor with 76 ppm/°C sensitivity driftA Hybrid Multi-Path CMOS Magnetic Sensorwith 76 ppm/˚C Sensitivity Drift. in ESSCIRC Conference 2016: 42nd European Solid-State Circuits Conference. IEEE , pp. 397-400, ESSDERC-ESSCIRC 2016, Lausanne, Switzerland, 12/09/16. https://doi.org/10.1109/esscirc.2016.7598325

A hybrid multi-path CMOS magnetic sensor with 76 ppm/°C sensitivity driftA Hybrid Multi-Path CMOS Magnetic Sensorwith 76 ppm/˚C Sensitivity Drift. / Jiang, J.; Makinwa, K.A.A.

ESSCIRC Conference 2016: 42nd European Solid-State Circuits Conference. IEEE , 2016. p. 397-400.

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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T1 - A hybrid multi-path CMOS magnetic sensor with 76 ppm/°C sensitivity driftA Hybrid Multi-Path CMOS Magnetic Sensorwith 76 ppm/˚C Sensitivity Drift

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N2 - 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.

AB - 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.

KW - Magnetic sensors

KW - Temperature sensors

KW - Sensivity

KW - Coils

KW - Temperature measurement

KW - Spinning

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M3 - Conference contribution

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Y2 - 12 September 2016 through 15 September 2016

ER -

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

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Keywords

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