Title :
Digitizing the feedback signal in a magnetic field (AMR) sensor system using delta sigma modulator topology
Author :
Halim, T. ; Leitis, Karsten
Author_Institution :
Dept. of Electr. Eng., Univ. of Appl. Sci. Giessen-Friedberg, Friedberg, Germany
Abstract :
Delta-Sigma modulation is a technique that is widely used for high accuracy analog to digital conversion. In this paper a method for a high resolution sensor system will be introduced by integrating the sensor as a delta element in a delta sigma modulator system. This proposed method is optimized for data acquisition purpose in a magnetic field sensor system using an AMR sensor. By analyzing the output bit-stream, which represents the feedback signal for the sensor, the input magnetic field can be determined. The modulator used is a first order modulator. The whole system operates at a power supply voltage of 1.5 V and is being realized in a 0.35 μm CMOS technology.
Keywords :
CMOS integrated circuits; analogue-digital conversion; delta-sigma modulation; feedback; magnetic sensors; AMR sensor system; CMOS technology; analog to digital conversion; data acquisition; delta element; delta sigma modulator topology; delta-sigma modulation; feedback signal; high resolution sensor system; magnetic field sensor; output bit-stream; CMOS integrated circuits; Coils; Current measurement; Delta-sigma modulation; Magnetic field measurement; Magnetic fields; Modulation; Magnetic field sensor; delta-sigma modulator; feedback system; magnetic feedback; sensor system;
Conference_Titel :
SoC Design Conference (ISOCC), 2012 International
Conference_Location :
Jeju Island
Print_ISBN :
978-1-4673-2989-7
Electronic_ISBN :
978-1-4673-2988-0
DOI :
10.1109/ISOCC.2012.6407052
