access icon free Simple linearising front-end-circuit for giant magneto-resistance sensors

© The Institution of Engineering and Technology
Received 12/10/2017, Published 29/11/2017
Errata or comment

A simple and efficient linearisation front-end circuit for giant magneto-resistance (GMR) sensors are presented. This circuit essentially uses only a single opamp to linearise the (non-linear) GMR sensor output. A novel methodology that places an active GMR element, present inside the GMR sensor, in the feedback loop of the opamp is employed for linearisation. Initial validation of the front-end is performed using simulation and emulation studies. Then, the front-end, fabricated on a printed-circuit board, is interfaced with a GMR sensor. Experimentation showed output non-linearity is around 0.6%. The proposed front-end possess merits, like, low component-count and minimal error, no requirement of expensive amplifiers or matched resistors for linearisation, fast response, over the existing methods.

Inspec keywords: printed circuits; magnetic sensors; operational amplifiers; giant magnetoresistance; circuit feedback

Other keywords: simple linearising front-end circuit; single opamp; printed-circuit board; giant magneto-resistance sensors; GMR sensors; feedback loop; active GMR element

Subjects: Sensing devices and transducers; Amplifiers; Printed circuits; Magneto-acoustic, magnetoresistive, magnetostrictive and magnetostatic wave devices

References

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      • 2. Jeng, J-T., Hsu, T-Y., Lu, C-C.: ‘Linearized giant-magnetoresistance sensor for static field measurement’. Int. Mechanical & Electrical Engineering Conf., Kyoto, Japan, August 2010, pp. V1–210–V1-212.
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      • 1. NVE Corp.: ‘Application notes for GMR sensors’. Available at http://www.nve.com/Downloads/apps.pdf, accessed August 2017.
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      • 4. Hoya, E.S., Casas, O., Pallas-Areny, R.: ‘Direct interface for magnetoresistive sensors’. Proc. IEEE Int. Instrumentation & Measurement Technology Conf., Warsaw, Poland, May 2007, pp. 1–6.
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2017.3860
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