Chopper stabilized CMOS integrated front-end for magnetic field measurement

Author

Frick, VIncent ; Pascal, Joris ; Blonde, Jean-Philippe ; Hebrard, Luc

Author_Institution

Institut d´´Electronique du Solide et des Syst., Strasbourg

fYear

2006

fDate

6-10 Nov. 2006

Firstpage

3090

Lastpage

3094

Abstract

This paper presents an analogue front-end dedicated to magnetic field measurement that is intended to be used in a mixed signal submicron CMOS microsystem. The front-end features a Hall device and its biasing circuitry both associated to a nested chopper-like structure. This system efficiently removes 1/f noise and reduces offset. The biasing amplifier is chopped at a frequency f_c in order to ensure steady ground referencing to the Hall device. This latter is operated using the spinning current technique at a frequency f_s = f_c/2. Sensitivities of 90 V/AT and resolutions of about 15 muT over a 1.6 kHz bandwidth extending from 5 to 1.6 kHz have been measured

Keywords

CMOS integrated circuits; Hall effect devices; amplifiers; choppers (circuits); magnetic field measurement; CMOS integrated front-end; Hall device; biasing amplifier; biasing circuitry; chopper; magnetic field measurement; mixed signal submicron CMOS microsystem; spinning current technique; CMOS technology; Choppers; Circuit noise; Frequency; Magnetic field measurement; Magnetic noise; Magnetic sensors; Noise reduction; Spinning; Tellurium;

fLanguage

English

Publisher

ieee

Conference_Titel

IEEE Industrial Electronics, IECON 2006 - 32nd Annual Conference on

Conference_Location

Paris

ISSN

1553-572X

Print_ISBN

1-4244-0390-1

Type

conf

DOI

10.1109/IECON.2006.347338

Filename

4153096