Title :
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
Abstract :
An ASIC for an integrated microfluxgate sensor uses pulsed excitation, a 2nd-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;
Conference_Titel :
Solid-State Circuits Conference, 2007. ISSCC 2007. Digest of Technical Papers. IEEE International
Conference_Location :
San Francisco, CA
Print_ISBN :
1-4244-0853-9
Electronic_ISBN :
0193-6530
DOI :
10.1109/ISSCC.2007.373455
