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Sensors 2014, 14(12), 24502-24522;

High Frequency Amplitude Detector for GMI Magnetic Sensors

University Grenoble-Alpes, G2Elab, F-38000 Grenoble, France
CNRS, G2Elab, F-38000 Grenoble, France
Author to whom correspondence should be addressed.
Received: 28 July 2014 / Revised: 15 November 2014 / Accepted: 11 December 2014 / Published: 19 December 2014
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in France)
Full-Text   |   PDF [1583 KB, uploaded 19 December 2014]


A new concept of a high-frequency amplitude detector and demodulator for Giant-Magneto-Impedance (GMI) sensors is presented. This concept combines a half wave rectifier, with outstanding capabilities and high speed, and a feedback approach that ensures the amplitude detection with easily adjustable gain. The developed detector is capable of measuring high-frequency and very low amplitude signals without the use of diode-based active rectifiers or analog multipliers. The performances of this detector are addressed throughout the paper. The full circuitry of the design is given, together with a comprehensive theoretical study of the concept and experimental validation. The detector has been used for the amplitude measurement of both single frequency and pulsed signals and for the demodulation of amplitude-modulated signals. It has also been successfully integrated in a GMI sensor prototype. Magnetic field and electrical current measurements in open- and closed-loop of this sensor have also been conducted. View Full-Text
Keywords: magnetic sensor; Giant Magneto-Impedance (GMI); high-frequency amplitude detector; amplitude demodulation magnetic sensor; Giant Magneto-Impedance (GMI); high-frequency amplitude detector; amplitude demodulation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Asfour, A.; Zidi, M.; Yonnet, J.-P. High Frequency Amplitude Detector for GMI Magnetic Sensors. Sensors 2014, 14, 24502-24522.

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