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

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

ISSCC（2007）

Cited 5|Views8

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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.

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Key words

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

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