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- W4380763447 abstract "Noncontact capacitive electrodes are a suitable choice for unobtrusive and long-term ECG/heart-rate monitoring applications but require a front-end amplifier with large input impedance, low noise, and motion artifact (MA) reduction methods. This article proposes a front-end amplifier structure with a fast reset scheme. It enables MA recovery prior to saturation and, therefore, avoids a long recovery process, which may take up to several seconds and results in signal loss in typical capacitive sensing systems. A reconstruction algorithm restores the waveform and, thus, extends the dynamic range beyond the original saturation level. The proposed fast-reset amplifier and a conventional pseudo-resistor biased amplifier were fabricated in a 180-nm CMOS technology. The electrical characterization results show that the fast-reset version is superior to the conventional structure, by achieving an input resistance of 1.8 <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$text{T}Omega $ </tex-math></inline-formula> , a 3–100-Hz, 2.3- <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$mu text{V}_{text {rms}}$ </tex-math></inline-formula> integrated noise level with a 10-pF source impedance, and the ability to deal with MA saturation. Finally, a four-channel system employing the proposed amplifiers was built. It can successfully measure ECG R-peaks through clothes, while the fast-reset scheme enables the continuous detection in the presence of MAs." @default.
- W4380763447 created "2023-06-16" @default.
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- W4380763447 date "2023-08-01" @default.
- W4380763447 modified "2023-09-27" @default.
- W4380763447 title "A Front-End Amplifier With Fast Reset Scheme for Capacitive Heart Rate Monitoring" @default.
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- W4380763447 doi "https://doi.org/10.1109/jsen.2023.3284894" @default.
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