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Kim, Seong-Jin
Bio-inspired Microsystems Lab (BiML)
Research Interests
  • Integrated analog-mixed signal circuit design, semiconductor sensor interface circuits

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A CMOS Microelectrode Array System With Reconfigurable Sub-Array Multiplexing Architecture Integrating 24,320 Electrodes and 380 Readout Channels

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Title
A CMOS Microelectrode Array System With Reconfigurable Sub-Array Multiplexing Architecture Integrating 24,320 Electrodes and 380 Readout Channels
Author
Cha, Ji-HyoungPark, Jee-HoPark, YongjaeShin, HyogeunHwang, Kyeong SeobCho, Il-JooKim, Seong-Jin
Issue Date
2022-12
Publisher
Institute of Electrical and Electronics Engineers
Citation
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS, v.16, no.6, pp.1044 - 1056
Abstract
This article presents a CMOS microelectrode array (MEA) system with a reconfigurable sub-array multiplexing architecture using the time-division multiplexing (TDM) technique. The system consists of 24,320 TiN electrodes with 17.7 µm-pitch pixels and 380 column-parallel readout channels including a low-noise amplifier, a programmable gain amplifier, and a 10-b successive approximation register analog to digital converter. Readout channels are placed outside the pixel for high spatial resolution, and a flexible structure to acquire neural signals from electrodes selected by configuring in-pixel memory is realized. In this structure, a single channel can handle 8 to 32 electrodes, guaranteeing a temporal resolution from 5kS/s to 20kS/s for each electrode. A 128 × 190 MEA system was fabricated in a 110-nm CMOS process, and each readout channel consumes 81 µW at 1.5-V supply voltage featuring input-referred noise of 1.48 µVrms without multiplexing and 5.4 µVrms with multiplexing at the action-potential band (300 Hz – 10 kHz).
URI
https://scholarworks.unist.ac.kr/handle/201301/60185
URL
http://dx.doi.org/10.1109/TBCAS.2022.3211275
DOI
10.1109/TBCAS.2022.3211275
ISSN
1932-4545
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