An Automatic Loop Gain Enhancement Technique in Magnetoimpedance-Based Magnetometer
نویسندگان
چکیده
A low-power, low-noise, and high-bandwidth magnetometer that utilizes the magnetoimpedance (MI) element as a sensor head is presented. The MI has high sensitivity, it can be implemented in mm-scale through MEMS process. analog front-end (AFE) circuit of includes digital calibration scheme automatically enhances loop gain system, resulting bandwidth low-noise characteristics. AFE designed based on switched-capacitor (SC) approach, its dedicated switching suppress folded noise an amplifier. single-coil magnetic negative feedback architecture with correlated double sampling (CDS) enables to achieve dynamic range (DR) stable passband addition simplifying structure element. chip 0.18- $\mu \text{m}$ CMOS process, achieves 8-pT/ notation="LaTeX">$\surd $ Hz floor within 31-kHz DR 96 dB, where power consumption 1.97 mW.
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ژورنال
عنوان ژورنال: IEEE Journal of Solid-state Circuits
سال: 2022
ISSN: ['0018-9200', '1558-173X']
DOI: https://doi.org/10.1109/jssc.2022.3202224