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

Abstract : A 4 nV/pHz at 10 Hz preamplifier with a 12 mW power consumption, in CMOS 0.35 ìm technology, has been developed in order to go one step further in the integration of the preamplifier of a search coil magnetometer. The present ASIC preamplifier, combined with a 10 cm length, 12 mm diameter and 15000 turns search coil sensor demonstrates a Noise Equivalent Magnetic Induction (NEMI) as low as 2 pT/p(Hz) at 10 Hz and 14 fT/p(Hz) at 4 kHz. The measured current noise is only 46 fA/pHz. AC magnetometers (100 mHz up to a few kHz) based on search coil sensors are used for space plasmas physics investigations due to their excellent robustness and very high sensitivity. The present ASIC preamplifier offers a way to save weight, volume and power considerably. The present work 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.sorbonne-universite.fr/hal-00733902
Contributor : Pascal Gomez <>
Submitted on : Thursday, September 20, 2012 - 9:43:21 AM
Last modification on : Friday, October 16, 2020 - 3:21:23 AM

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Amine Rhouni, Gérard Sou, Paul Leroy, Christophe Coillot. A 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, 2013, 13 (1), pp.159 - 166. ⟨10.1109/JSEN.2012.2211347⟩. ⟨hal-00733902⟩

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