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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 Multimodal Neural Activity Readout Integrated Circuit for Recording Fluorescence and Electrical Signals

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dc.contributor.author Lee, Taeju ko
dc.contributor.author Park, Jee-Ho ko
dc.contributor.author Chou, Namsun ko
dc.contributor.author Cho, Il-Joo ko
dc.contributor.author Kim, Seong-Jin ko
dc.contributor.author Je, Minkyu ko
dc.date.available 2021-09-16T08:05:35Z -
dc.date.created 2021-09-10 ko
dc.date.issued 2021-09 ko
dc.identifier.citation IEEE ACCESS, v.9, pp.118610 - 118623 ko
dc.identifier.issn 2169-3536 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/53953 -
dc.description.abstract Monitoring the electrical neural signals is an important method for understanding the neuronal mechanism. In particular, in order to perform a cell-type-specific study, it is necessary to observe the concentration of calcium ions using fluorescent indicators in addition to measuring the electrical neural signal. This paper presents a multimodal multichannel neural activity readout integrated circuit that can perform not only electrical neural recording but also fluorescence recording of neural activity for the cell-type-specific study of heterogeneous neuronal cell populations. For monitoring the calcium ions, the photodiode generates the current according to the fluorescence expressed by the reaction between the genetically encoded calcium indicators and calcium ions. The time-based fluorescence recording circuit then records the photodiode current. The electrical neural signal captured by the microelectrode is recorded through the low-noise amplifier, variable gain amplifier, and analog-to-digital converter. The proposed integrated circuit is fabricated in a 1-poly 6-metal (1P6M) 0.18- μm CMOS process. The fluorescence recording circuit achieves a recording range of 81 dB (75 pA to 860 nA) and consumes a power of 724 nW/channel. The electrical recording circuit achieves an input-referred noise of 2.7 μVrms over the bandwidth of 10 kHz, while consuming the power of 4.9 μW /channel. The functionality of the proposed circuits is verified through the in vivo and in vitro experiments. Compared to the conventional neuroscience tools, which consist of bulky off-chip components, this neural interface is implemented in a compact size to perform multimodal neural recording while consuming low power. ko
dc.language 영어 ko
dc.publisher Institute of Electrical and Electronics Engineers Inc. ko
dc.title A Multimodal Neural Activity Readout Integrated Circuit for Recording Fluorescence and Electrical Signals ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-85113883792 ko
dc.type.rims ART ko
dc.identifier.doi 10.1109/access.2021.3107299 ko
dc.identifier.url https://ieeexplore.ieee.org/document/9521539 ko
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