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Very Low 1/f Noise and Radiation-Hardened CMOS Preamplifier for High-Sensitivity Search Coil Magnetometers

Abstract : A 4 nV/√(Hz) at 10 Hz preamplifier with a 12-mW power consumption in complimentary metal-oxide-semiconductor 0.35 μm technology has been developed to go one step further in the integration of the preamplifier of a search coil magnetometer. The present application-specific integrated circuit (ASIC) preamplifier, combined with a 10-cm length, 12-mm diameter, and 15 000 turns search coil sensor demonstrates a noise equivalent magnetic induction as low as 2 pT/√(Hz) at 10 Hz and 14 fT/√(Hz) at 4 kHz. The measured current noise is only 46 fA/√(Hz). AC magnetometers (from 100 mHz to a few kHz) based on search coil sensors are used for space plasma physics investigations because of their excellent robustness and very high sensitivity. The present ASIC preamplifier offers a way to considerably save weight, volume, and power. This paper will focus on the design of the ASIC, driven by the following criteria: low thermal and 1/f noise, radiation hardness for space purpose, and power consumption.
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https://hal.archives-ouvertes.fr/hal-01467697
Contributor : Amine Rhouni <>
Submitted on : Tuesday, February 14, 2017 - 4:18:10 PM
Last modification on : Friday, October 16, 2020 - 3:21:22 AM

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Amine Rhouni, Gérard Sou, Paul Leroy, Christophe Coillot. Very Low 1/f Noise and Radiation-Hardened CMOS Preamplifier for High-Sensitivity Search Coil Magnetometers. IEEE Sensors Journal, Institute of Electrical and Electronics Engineers, 2012, 13 (1), pp.159-166. ⟨10.1109/JSEN.2012.2211347⟩. ⟨hal-01467697⟩

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