This paper presents a novel z-axis Lorentz force magnetometer coupled with a low-power readout integrated circuit. The sensor is fabricated using an industrial process, and exploits an Al-on-polysilicon multi-loop architecture that gives a five-fold sensitivity and resolution improvement, useful for off-resonance operation. The integrated readout is based on a differential charge amplifier front-end, and designed to be balanced with the sensor in terms of noise and power consumption. The overall system, including demodulation and filtering stages, shows a programmable full-scale up to ±2.4 mT, limited by the electronics saturation. The bandwidth can be programmed up to 150 Hz for off-resonance operation where a sub-400-nT/√Hz resolution at 775-µW power consumption is obtained, including the integrated readout and the Lorentz current. Perspectives on low-consumption driving oscillators for off-resonance mode are finally given.
A Sub-400-nT/√Hz, 775-μW, Multi-Loop MEMS Magnetometer With Integrated Readout Electronics
MINOTTI, PAOLO;BRENNA, STEFANO;LAGHI, GIACOMO;BONFANTI, ANDREA GIOVANNI;LANGFELDER, GIACOMO;LACAITA, ANDREA LEONARDO
2015-01-01
Abstract
This paper presents a novel z-axis Lorentz force magnetometer coupled with a low-power readout integrated circuit. The sensor is fabricated using an industrial process, and exploits an Al-on-polysilicon multi-loop architecture that gives a five-fold sensitivity and resolution improvement, useful for off-resonance operation. The integrated readout is based on a differential charge amplifier front-end, and designed to be balanced with the sensor in terms of noise and power consumption. The overall system, including demodulation and filtering stages, shows a programmable full-scale up to ±2.4 mT, limited by the electronics saturation. The bandwidth can be programmed up to 150 Hz for off-resonance operation where a sub-400-nT/√Hz resolution at 775-µW power consumption is obtained, including the integrated readout and the Lorentz current. Perspectives on low-consumption driving oscillators for off-resonance mode are finally given.File | Dimensione | Formato | |
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JMEMS.pdf
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SUB-400-nT-MULTI-LOOP MEMS MAGNETOMETER_11311-971783_Bonfanti.pdf
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