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)

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, Professor 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