Title :
A 12 bit A/D interface for a 3D magnetic sensor
Author :
Malcovati, P. ; Maloberti, F. ; Pesucci, A. ; Poletti, Mark A.
Author_Institution :
Integrated Microsyst. Lab., Pavia Univ., Italy
Abstract :
This paper presents a high resolution low-power smart system for 3D magnetic field monitoring. The magnetic sensors, integrated on-chip, need a bias current of a few mA to achieve the required resolution. Nevertheless, the proposed 12 bit A/D converter allows pulsed operation of the sensors with a duty cycle as low as 4 10-5, thus keeping the system power consumption below 1 μW. The A/D converter operates with 500 kHz clock frequency and achieves a DNL below 0.2 LSB and an INL below 0.5 LSB in worst case simulations. A prototype of the system has been integrated in a 1.2 μm CMOS technology
Keywords :
CMOS integrated circuits; analogue-digital conversion; clocks; intelligent sensors; magnetic sensors; 1.2 micron; 12 bit; 3D magnetic sensor; 500 kHz; A/D interface; CMOS technology; DNL; INL; bias current; clock frequency; duty cycle; low-power smart system; magnetic field monitoring; pulsed operation; system power consumption; worst case simulations; CMOS technology; Clocks; Energy consumption; Frequency conversion; Intelligent sensors; Magnetic fields; Magnetic sensors; Monitoring; Prototypes; Sensor systems;
Conference_Titel :
Circuits and Systems, 1997. ISCAS '97., Proceedings of 1997 IEEE International Symposium on
Print_ISBN :
0-7803-3583-X
DOI :
10.1109/ISCAS.1997.608487
