Very Low 1/f Noise and Radiation-Hardened CMOS Preamplifier for High-Sensitivity Search Coil Magnetometers
Very Low 1/f Noise and Radiation-Hardened CMOS Preamplifier for High-Sensitivity Search Coil Magnetometers
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适用于高灵敏度搜索线圈磁力计的极低 1/f 噪声和抗辐射 CMOS 前置放大器
DOI：
10.1109/jsen.2012.2211347
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发表时间：
2013
影响因子：
4.3
通讯作者：
C. Coillot
中科院分区：
文献类型：
--
作者：
A. Rhouni;G. Sou;P. Leroy;C. Coillot
采用互补金属氧化物半导体 0.35 μm 技术的 4 nV/√(Hz) 前置放大器（10 Hz）功耗为 12 mW，旨在进一步实现搜索线圈磁力计前置放大器的集成。目前的专用集成电路 (ASIC) 前置放大器与 10 厘米长、12 毫米直径和 15 000 匝搜索线圈传感器相结合，在 10 Hz 时表现出低至 2 pT/√(Hz) 的噪声等效磁感应强度，在 4 kHz 时低至 14 fT/√(Hz) 的噪声等效磁感应强度。测得的电流噪声仅为 46 fA/√(Hz)。基于搜索线圈传感器的交流磁力计（从 100 mHz 到几 kHz）因其出色的鲁棒性和极高的灵敏度而被用于空间等离子体物理研究。目前的 ASIC 前置放大器提供了一种显着减轻重量、体积和功耗的方法。本文将重点关注 ASIC 的设计，并遵循以下标准：低热噪声和 1/f 噪声、空间用途的辐射硬度以及功耗。
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.