Title :
Development of multicore magneto-impedance sensor for stable pico-Tesla resolution
Author :
Uchiyama, Tsuyoshi ; Hamada, Nozomu ; Changmei Cai
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Nagoya Univ., Nagoya, Japan
Abstract :
We investigated the noise from amorphous wire magneto-impedance elements in a CMOS pulse sensor circuit and clarified the average current bias effect for low-noise magneto-impedance sensor operation. In order to raise the signal-to-noise ratio (SNR), a single-core head and multicore head were compared. We showed that the noise floor of the four-core head magneto-impedance sensor is lower than 1 pT/Hz1/2 for the frequency range of 20 to 500 Hz. This result will be useful for designing a high SNR magneto-impedance sensor based on amorphous wire in combination with a CMOS pulse circuit.
Keywords :
CMOS integrated circuits; magnetic cores; magnetic sensors; pulse circuits; CMOS pulse sensor circuit; current bias effect; frequency 20 Hz to 500 Hz; low-noise magnetoimpedance sensor operation; multicore head; multicore magneto-impedance sensor; signal-to-noise ratio; single-core head; stable picoTesla resolution; Amorphous magnetic materials; Coils; Magnetic heads; Magnetic noise; Magnetic shielding; Noise; Wires; amorphous wire; magetic sensor; magneto-impedance element; pico-Tesla resolution;
Conference_Titel :
Sensing Technology (ICST), 2013 Seventh International Conference on
Conference_Location :
Wellington
Print_ISBN :
978-1-4673-5220-8
DOI :
10.1109/ICSensT.2013.6727718
