A fully integrated CMOS magnetic current monitor

Author

Malcovati, Piero ; Maloberti, Franco

Author_Institution

Dept. of Electr. Eng., Pavia Univ., Italy

Volume

5

fYear

1999

fDate

1999

Firstpage

128

Abstract

In this paper we present a fully-integrated magnetic current monitor, which allows accurate and non-invasive current measurements in industrial apparatus. The magnetic field generated by the current to be measured is sensed by a Hall device, amplified, converted into the digital domain with 9 bits of resolution and delivered to an on-board I ²S serial interface. The voltage amplifier provides digitally programmable gain and offset. On-chip Zener-tapping circuits are used as PROM to store the gain and offset calibration words. Two different operating ranges (20 A and 200 A full scale) are available with independent calibration coefficients. A prototype of the complete microsystem has been integrated in a conventional 0.8 μm CMOS process. Experimental results are presented

Keywords

CMOS integrated circuits; Hall effect transducers; calibration; electric current measurement; magnetic sensors; mixed analogue-digital integrated circuits; monitoring; 0.8 micron; 20 A; 200 A; 256 kHz; 5 V; ASIC; CMOS magnetic current monitor; Hall device; PROM; calibration words storage; digitally programmable gain; digitally programmable offset; fully-integrated current monitor; gain calibration words; independent calibration coefficients; industrial apparatus; noninvasive current measurements; offset calibration words; onboard I²S serial interface; onchip Zener-tapping circuits; voltage amplifier; CMOS process; Calibration; Current measurement; Integrated circuit measurements; Magnetic domains; Magnetic field measurement; Monitoring; PROM; Prototypes; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1999. ISCAS '99. Proceedings of the 1999 IEEE International Symposium on

Conference_Location

Orlando, FL

Print_ISBN

0-7803-5471-0

Type

conf

DOI

10.1109/ISCAS.1999.777527

Filename

777527