A CMOS Current-Mode Magnetic Hall Sensor With Integrated Front-End

• Published in: IEEE transactions on circuits and systems. I, Regular papers Vol. 62; no. 5; pp. 1270 - 1278
• Main Authors: Heidari, Hadi, Bonizzoni, Edoardo, Gatti, Umberto, Maloberti, Franco
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.05.2015; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Choppers (circuits); Circuits; CMOS; CMOS Hall sensors; CMOS integrated circuits; CMOS technology; Current measurement; current spinning; Design engineering; Electronics; Hall effect; magnetic sensor; Noise; Offsets; Sensitivity; Sensors; Spinning
• ISSN: 1549-8328; 1558-0806
• DOI: 10.1109/TCSI.2015.2415173

A Hall magnetic sensor working in the current domain and its electronic interface are presented. The paper describes the physical sensor design and implementation in a standard CMOS technology, the transistor level design of its high sensitive front-end together with the sensor experimental characterization. The current-mode Hall sensor and the analog readout circuit have been fabricated using a 0.18- μm CMOS technology. The sensor uses the current spinning technique to compensate for the offset and provides a differential current as an output signal. The measured sensor power consumption and residual offset are 120 μW and 50 μT, respectively.