JSTS:Journal of Semiconductor Technology and Science

  • 제14권5호
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  • Pages.658-665
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  • 2014
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  • 1598-1657(pISSN)
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  • 2233-4866(eISSN)
대한전자공학회 (The Institute of Electronics and Information Engineers)
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A 16-channel Neural Stimulator IC with DAC Sharing Scheme for Artificial Retinal Prostheses

  • Seok, Changho (Department of Electronics, Chungnam National University) ;
  • Kim, Hyunho (Department of Electronics, Chungnam National University) ;
  • Im, Seunghyun (Department of Electronics, Chungnam National University) ;
  • Song, Haryong (Department of Electronics, Chungnam National University) ;
  • Lim, Kyomook (Department of Electronics, Chungnam National University) ;
  • Goo, Yong-Sook (Department of Physiology, College of Medicine, Chungbuk National University) ;
  • Koo, Kyo-In (Department of Electrical Engineering, University of Ulsan) ;
  • Cho, Dong-Il (ASRI/ISRC, Department of Electrical and Computer Engineering, Seoul National University) ;
  • Ko, Hyoungho (Department of Electronics, Chungnam National University)
  • 투고 : 2014.06.10
  • 심사 : 2014.08.12
  • 발행 : 2014.10.30
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초록

The neural stimulators have been employed to the visual prostheses system based on the functional electrical stimulation (FES). Due to the size limitation of the implantable device, the smaller area of the unit current driver pixel is highly desired for higher resolution current stimulation system. This paper presents a 16-channel compact current-mode neural stimulator IC with digital to analog converter (DAC) sharing scheme for artificial retinal prostheses. The individual pixel circuits in the stimulator IC share a single 6 bit DAC using the sample-and-hold scheme. The DAC sharing scheme enables the simultaneous stimulation on multiple active pixels with a single DAC while maintaining small size and low power. The layout size of the stimulator circuit with the DAC sharing scheme is reduced to be 51.98 %, compared to the conventional scheme. The stimulator IC is designed using standard $0.18{\mu}m$ 1P6M process. The chip size except the I/O cells is $437{\mu}m{\times}501{\mu}m$.

키워드

참고문헌

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피인용 문헌

  1. Fabrication and evaluation of nanostructured microelectrodes for high-spatial resolution in retinal prostheses pp.1432-1858, 2019, https://doi.org/10.1007/s00542-018-4276-5