A 32-Channel Time-Multiplexed Artifact-Aware Neural Recording System
| Autor: | Manuel Delgado-Restituto, Norberto Perez-Prieto, Manuel Alvarez-Dolado, Ángel Rodríguez-Vázquez |
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| Přispěvatelé: | Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Computer science
Biomedical Engineering LFP Local field potential Multiplexing Mice Electric Power Supplies system-on-chip Electronic engineering Animals Electrical and Electronic Engineering time multiplexing artifact-aware Electrodes auto-ranging Neurons Artifact (error) Amplifiers Electronic Dynamic range biomedical electronics neural recording correlated double sampling Signal Processing Computer-Assisted Equipment Design CMOS integrated circuits spatial delta encoding ECoG Power (physics) Brain implant Noise offset reduction loop neurophysiology Artifacts Algorithms Communication channel |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | This paper presents a low-power, low-noise microsystem for the recording of neural local field potentials or intracranial electroencephalographic signals. It features 32 timemultiplexed channels at the electrode interface and offers the possibility to spatially delta encode data to take advantage of the large correlation of signals captured from nearby channels. The circuit also implements a mixed-signal voltage-triggered autoranging algorithm which allows to attenuate large interferers in digital domain while preserving neural information. This effectively increases the system dynamic range and avoids the onset of saturation. A prototype, fabricated in a standard 180nm CMOS process, has been experimentally verified in-vitro with cellular cultures of primary cortical neurons from mice. The system shows an integrated input-referred noise in the 0.5–200 Hz band of 1.4 Vrms for a spot noise of about 85 nV= p Hz. The system draws 1.5 W per channel from 1.2V supply and obtains 71 dB + 26 dB dynamic range when the artifact-aware autoranging mechanism is enabled, without penalising other critical specifications such as crosstalk between channels or commonmode and power supply rejection ratios. |
| Databáze: | OpenAIRE |
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