A 0.18-µm CMOS Current-Mode Hall Magnetic Sensor with Very Low Bias Current and High Sensitive Front-End

Heidari, H., Bonizzoni, E., Gatti, U. and Maloberti, F. (2014) A 0.18-µm CMOS Current-Mode Hall Magnetic Sensor with Very Low Bias Current and High Sensitive Front-End. In: 2014 IEEE Sensors, Valencia, Spain, 02-05 Nov 2014, pp. 1467-1470. (doi:10.1109/ICSENS.2014.6985291)

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Publisher's URL: http://dx.doi.org/10.1109/ICSENS.2014.6985291

Abstract

This paper describes a magnetic Hall sensor working in current mode and its electronic interface. The microsystem uses the current spinning technique to compensate for the offset and provides a differential output signal current. The use of a low-noise chopper stabilized operational amplifier enables the integration of the signal current and ensures, after the sensor interface, a voltage sensitivity of 1660 V/A/mT (@ 25 kS/s) with a sensor bias current as low as 12 μA. The current-mode Hall sensor and the analog integrator read-out circuit have been fabricated with a 6-metal 0.18-μm standard CMOS technology. The current spinning technique reduces the offset to less than 50 μT (measured over 10 samples).

Item Type:Conference Proceedings
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Heidari, Dr Hadi
Authors: Heidari, H., Bonizzoni, E., Gatti, U., and Maloberti, F.
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering

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