A 100Hz 5nT/Hz Low-Pass ΔΣ Servo-Controlled Microfluxgate Magnetometer Using Pulsed Excitation

Author

Gayral, Fabrice ; Delevoye, Elisabeth ; Condemine, Cyril ; Colinet, Eric ; Béranger, Marc ; Mieyeville, Fabien ; Gaffiot, Frédéric

Author_Institution

CEA-LETI, Grenoble

fYear

2007

fDate

11-15 Feb. 2007

Firstpage

384

Lastpage

610

Abstract

An ASIC for an integrated microfluxgate sensor uses pulsed excitation, a 2^nd-order DeltaSigma modulator, an LPF and an FIR DAC current generator in a fully-digital field-canceling loop to achieve high linearity over a 120muT DR. A low noise floor of 5nTA/radicHz is measured over a 100Hz BW. This ASIC can be adapted to numerous applications since it is fully programmable. The 9mm² ASIC consumes 36mW from 3.3V and is fabricated in a 0.35mum CMOS process.

Keywords

CMOS integrated circuits; FIR filters; application specific integrated circuits; delta-sigma modulation; fluxgate magnetometers; low-pass filters; microsensors; 0.35 micron; 100 Hz; 3.3 V; 36 mW; ASIC; CMOS process; FIR DAC current generator; LPF; delta-sigma modulator; fully-digital field-canceling loop; microfluxgate magnetometer; microfluxgate sensor; pulsed excitation; Application specific integrated circuits; Delta modulation; Finite impulse response filter; Linearity; Magnetic sensors; Magnetometers; Modulation coding; Pulse generation; Pulse measurements; Pulse modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 2007. ISSCC 2007. Digest of Technical Papers. IEEE International

Conference_Location

San Francisco, CA

ISSN

0193-6530

Print_ISBN

1-4244-0853-9

Electronic_ISBN

0193-6530

Type

conf

DOI

10.1109/ISSCC.2007.373455

Filename

4242426