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Arabian Journal for Science and Engineering
Erschienen in: Arabian Journal for Science and Engineering 3/2020

28.01.2020 | Research Article-Electrical Engineering

Noise Optimization of CMOS Front-End Amplifier for Embedded Biomedical Recording

verfasst von: Hyem Saadi, Mokhtar Attari, Hammoudi Escid

Erschienen in: Arabian Journal for Science and Engineering | Ausgabe 3/2020

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Abstract

This paper deals with the noise optimization of a low-power front-end amplifier (FEA) integrating a band-pass filter for EEG signal recording. The AC-coupled and capacitive feedback structures have been adopted in order to reject the large DC offset generated at the electrode–skin interface. A high open-loop gain with acceptable phase margin was obtained with the proposed operational transconductance amplifier architecture. The methodology to reach a low noise-to-power trade-off is based on selecting the suitable operation region of each transistor, especially the input differential pair by considering the gm/ID parameter. The proposed amplifier was implemented in both 0.13 μm and 0.18 μm CMOS processes with a supply voltage set to ± 1 V. For both technologies, the obtained gain and bandwidth are practically similar, while the phase margin obtained in the first process (0.13 μm) is higher than the one obtained in the second process (0.18 μm); however, both values insure system stability. A lower total input-referred noise of 1.7 µVrms with a noise efficiency factor of 3.4 was obtained in 0.18 µm CMOS process. The designed FEA has been found suitable for ECG biopotential recording.
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Metadaten
Titel
Noise Optimization of CMOS Front-End Amplifier for Embedded Biomedical Recording
verfasst von
Hyem Saadi
Mokhtar Attari
Hammoudi Escid
Publikationsdatum
28.01.2020
Verlag
Springer Berlin Heidelberg
Erschienen in
Arabian Journal for Science and Engineering / Ausgabe 3/2020
Print ISSN: 2193-567X
Elektronische ISSN: 2191-4281
DOI
https://doi.org/10.1007/s13369-020-04347-3

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