A new compact 2D planar fluxgate sensor with amorphous metal core

Pavel Kejik, Radivoje Popovic
1998
Conference paper

A new compact 2D planar fluxgate sensor using a ferromagnetic amorphous metal core is described. The fluxgate sensor consists of two orthogonal planar coils and an amorphous magnetic ring core mounted on a PCB substrate. Each planar coil is used alternatively as excitation or as pick-up coil. An electronic interface drives alternatively the two coils and performs a feedback on each sensing coil in order to compensate for the measured magnetic field. The sensing element has a magnetic detectivity of 40nT for an excitation frequency of 10kHz and a 160mApeak driving current.

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Pavel Kejik, Radivoje Popovic
1998
Conference paper

Abstract

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https://infoscience.epfl.ch/record/163302?ln=en

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CMOS planar 2D micro-fluxgate sensor

Pavel Kejik, Radivoje Popovic

An electronic compass made of a new planar 2D micro-fluxgate sensor is presented. The magnetometer is integrated in a standard CMOS process, and uses a post-processed cross shape ferromagnetic amorphous core. This core is diagonally placed above a single square excitation coil common to both measurement axes. The silicon chip includes the driving and readout electronics, the excitation and pick-up coils made of the two CMOS process metallization layers. The ferromagnetic core is integrated from commercially available amorphous metal ribbons, by using a post-process compatible with standard IC technologies. Such a ferromagnetic core presents outstanding magnetic characteristics compared to usual electroplated cores. The micro-fluxgate works with a pulse shape driving current which allows the sensor output to be independent of the driving frequency. The current pulse width ratio of 1:8 reduces drastically the power consumption. For magnetic fields within ±60 μT, the micro-fluxgate sensor exhibits a magnetic sensitivity of 3760 V/T at 125 kHz with an amplification gain of 26.4 dB. The angle error on the Earth’s magnetic field is ±1.5°. The chip has a power consumption of 12.5 mW for a 20 mApeak driving current; its area is 5.3 mm2.

1999

CMOS planar 2D micro-fluxgate sensor

Pavel Kejik, Radivoje Popovic

An electronic compass made of a new planar 2D micro-fluxgate sensor is presented. The magnetometer is integrated in a standard CMOS process, and uses a post-processed cross-shaped ferromagnetic amorphous core. This core is diagonally placed above a single square excitation coil common to both measurement axes. The silicon chip includes the driving and readout electronics, the excitation and pick-up coils made of the two CMOS process metallization layers. The ferromagnetic core is integrated from commercially available amorphous metal ribbons, by using a post-process compatible with standard IC technologies. Such a ferromagnetic core presents outstanding magnetic characteristics compared to usual electroplated cores. The micro-fluxgate works with a pulse-shaped driving current which allows the sensor output to be independent of the driving frequency. The current pulse width ratio of 1/8 reduces drastically the power consumption. For magnetic fields within "60 mT, the micro-fluxgate sensor exhibits a magnetic sensitivity of 3760 VrT at 125 kHz with an amplification gain of 26.4 dB. The angle error on the Earth’s magnetic field is "1.58. The chip has a power consumption of 12.5 mW for a 17 mA-peak driving current; its area is of 5.3 mm2.

Elsevier2000

Magnetic field

A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a for

Magnetic core

A magnetic core is a piece of magnetic material with a high magnetic permeability used to confine and guide magnetic fields in electrical, electromechanical and magnetic devices such as electromagnet

Sensor

A sensor is a device that produces an output signal for the purpose of sensing a physical phenomenon. In the broadest definition, a sensor is a device, module, machine, or subsystem that detects ev