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dc.contributor.author
Lee, Changuk
dc.contributor.author
Kim, Byeongseol
dc.contributor.author
Kim, Jejung
dc.contributor.author
Lee, Sangwon
dc.contributor.author
Jeon, Taejune
dc.contributor.author
Choi, Woojun
dc.contributor.author
Yang, Sunggu
dc.contributor.author
Ahn, Jong-Hyun
dc.contributor.author
Bae, Joonsung
dc.contributor.author
Chae, Youngcheol
dc.date.accessioned
2022-09-23T03:03:38Z
dc.date.available
2022-09-23T03:03:38Z
dc.date.issued
2022-09-13
dc.identifier.issn
0018-9200
dc.identifier.issn
1558-173X
dc.identifier.other
10.1109/JSSC.2022.3202795
dc.identifier.uri
http://hdl.handle.net/20.500.11850/572442
dc.description.abstract
This article presents a wireless neural implant with body-coupled (BC) data transmission and power delivery for freely behaving animals and incorporates a precision front end for high-quality neural recordings. The neural implant utilizes the body as a wireless transmission medium where it only needs small electrodes for data transmission and power delivery. An external device with patch electrodes can then be placed far away from the implant without the need for precise alignment. Furthermore, a four-channel continuous-time delta-sigma modulator (CT-Delta Sigma M) is integrated into the system for precision neural recordings. Each neural recording CT-Delta Sigma M achieves an 823-dB signal-to-noise and distortion ratio (SNDR) and an 833-dB dynamic range (DR) while consuming only 8.6-mu W at a signal bandwidth of 10 kHz. The neural implant integrated circuit (IC) is fabricated in a 0.11-mu m CMOS with a high-density capacitor option, and the BC data receiver (RX) IC is implemented in a 0.18-mu m CMOS. The implant IC occupies a chip area of 4 mm(2), including a 5-0 on-chip capacitor, and draws 280 mu A from a 2.3-V supply with a working data transmitter (TX) electrode. By exploiting direct-digital signaling for data transmission, the neural implant achieves a data rate of 20.48 Mb/s and a wireless power recovery of 644 mu W, resulting in an energy efficiency of 32 pJ/b. The entire neural implant system has been successfully verified by both electrical and in Piro measurements, while the wirelessly recorded electrocorticography (ECoG) signals with the prototype neural implant inside a rat demonstrate the end-to-end functionality of the proposed system.
dc.publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
dc.subject
Analog-to-digital converter
dc.subject
body-coupled (BC)
dc.subject
continuous-time delta-sigma modulator (CT-Delta Sigma M)
dc.subject
implantable biomedical device
dc.subject
miniaturized
dc.subject
neural recording
dc.subject
wireless power and data transmission
dc.title
A Miniaturized Wireless Neural Implant With Body-Coupled Power Delivery and Data Transmission
dc.type
Journal Article
ethz.journal.title
IEEE Journal of Solid-State Circuits
ethz.journal.abbreviated
IEEE J. Solid-State Circuits
ethz.identifier.wos
ethz.publication.place
PISCATAWAY
ethz.date.deposited
2022-09-23T03:03:41Z
ethz.source
WOS
ethz.rosetta.exportRequired
true
ethz.COinS
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