Design and Validation of High-Efficiency Chopper for Magnetoresistive Sensors

Autor:	R. B. van Dover, Hsin-Wei Tseng, Huanan Duan, Ajay Gupta, Y. Li
Rok vydání:	2012
Předmět:	Chopper Materials science Magnetoresistance Magnetic reluctance Electronic engineering Electrical and Electronic Engineering Concentrator Sensitivity (electronics) Noise (electronics) Magnetic flux Finite element method Electronic Optical and Magnetic Materials
Zdroj:	IEEE Transactions on Magnetics. 48:2461-2466
ISSN:	1941-0069 0018-9464
DOI:	10.1109/tmag.2012.2196442
Popis:	Low-frequency noise, i.e., 1/f noise severely limits the low-frequency performance of magnetoresistive sensors for applications as ultrasensitive magnetic sensors. The combination of a flux concentrator and chopping system has been proposed to mitigate the effect of 1/f noise and improve the field sensitivity. This paper reports a high-efficiency chopping system for magnetoresistive sensors. A simple reluctance analysis allows us to estimate the chopping efficiency and optimize the design, and finite-element simulations confirm the operation. Experimental results based on the optimized design using an anisotropic magnetoresistance sensor validate the concept. The sensitivity of the sensor with the chopper at OFF and ON positions is determined to be 0.009 and 0.067%/Oe, respectively, which yields a high sensitivity chopping efficiency, namely 72%.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ae3fef06b781e5796e2ba347ff8442c1 https://doi.org/10.1109/tmag.2012.2196442 Zobrazit plný text záznamu