A precise charge balancing and compliance voltage monitoring stimulator front-end for 1024-electrodes retinal prosthesis

Hosung Chun; Nhan Tran; Yuanyuan Yang; Omid Kavehei; Shun Bai; Stan Skafidas

doi:10.1109/EMBC.2012.6346595

A precise charge balancing and compliance voltage monitoring stimulator front-end for 1024-electrodes retinal prosthesis

Hosung Chun, Nhan Tran, Yuanyuan Yang, Omid Kavehei, Shun Bai, Stan Skafidas

Research output: Chapter in Book/Conference proceeding › Conference contribution › peer-review

7 Citations (Scopus)

Abstract

In this paper, we present a precise charge balancing and compliance voltage monitoring stimulator front-end for 1024-electrode retinal prosthesis. Our stimulator is based on current mode stimulation. To generate a precisely matched biphasic current pulse, a dynamic current copying technique is applied at the stimulator front-end. A compliance voltage monitoring circuitry is included at the stimulator front-end to detect if a voltage across electrode-tissue interface goes beyond a predefined compliance voltage. Simulation results show the mismatch of a biphasic current pulse (at a maximum stimulation current of 476μA) is less than 0.1%. Also, the stimulator issues alarm signals, when a voltage compliance occurs during stimulation due to high tissue impedance. Our stimulator is implemented using a 65nm low voltage (LV) CMOS process, which helps reducing implementation area and power consumption.

Original language	English
Title of host publication	2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2012
Pages	3001-3004
Number of pages	4
DOIs	https://doi.org/10.1109/EMBC.2012.6346595
Publication status	Published - 2012
Externally published	Yes
Event	34th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS 2012 - San Diego, CA, United States Duration: 28 Aug 2012 → 1 Sept 2012

Publication series

Name	Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS
ISSN (Print)	1557-170X

Conference

Conference	34th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS 2012
Country/Territory	United States
City	San Diego, CA
Period	28/08/12 → 1/09/12

ASJC Scopus subject areas

Signal Processing
Biomedical Engineering
Computer Vision and Pattern Recognition
Health Informatics

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10.1109/EMBC.2012.6346595

Cite this

Chun, H., Tran, N., Yang, Y., Kavehei, O., Bai, S., & Skafidas, S. (2012). A precise charge balancing and compliance voltage monitoring stimulator front-end for 1024-electrodes retinal prosthesis. In 2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2012 (pp. 3001-3004). Article 6346595 (Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS). https://doi.org/10.1109/EMBC.2012.6346595

Chun, Hosung ; Tran, Nhan ; Yang, Yuanyuan et al. / A precise charge balancing and compliance voltage monitoring stimulator front-end for 1024-electrodes retinal prosthesis. 2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2012. 2012. pp. 3001-3004 (Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS).

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title = "A precise charge balancing and compliance voltage monitoring stimulator front-end for 1024-electrodes retinal prosthesis",

abstract = "In this paper, we present a precise charge balancing and compliance voltage monitoring stimulator front-end for 1024-electrode retinal prosthesis. Our stimulator is based on current mode stimulation. To generate a precisely matched biphasic current pulse, a dynamic current copying technique is applied at the stimulator front-end. A compliance voltage monitoring circuitry is included at the stimulator front-end to detect if a voltage across electrode-tissue interface goes beyond a predefined compliance voltage. Simulation results show the mismatch of a biphasic current pulse (at a maximum stimulation current of 476μA) is less than 0.1%. Also, the stimulator issues alarm signals, when a voltage compliance occurs during stimulation due to high tissue impedance. Our stimulator is implemented using a 65nm low voltage (LV) CMOS process, which helps reducing implementation area and power consumption.",

author = "Hosung Chun and Nhan Tran and Yuanyuan Yang and Omid Kavehei and Shun Bai and Stan Skafidas",

note = "Copyright: Copyright 2013 Elsevier B.V., All rights reserved.; 34th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS 2012 ; Conference date: 28-08-2012 Through 01-09-2012",

year = "2012",

doi = "10.1109/EMBC.2012.6346595",

language = "English",

isbn = "9781424441198",

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Chun, H, Tran, N, Yang, Y, Kavehei, O, Bai, S & Skafidas, S 2012, A precise charge balancing and compliance voltage monitoring stimulator front-end for 1024-electrodes retinal prosthesis. in 2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2012., 6346595, Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS, pp. 3001-3004, 34th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS 2012, San Diego, CA, United States, 28/08/12. https://doi.org/10.1109/EMBC.2012.6346595

A precise charge balancing and compliance voltage monitoring stimulator front-end for 1024-electrodes retinal prosthesis. / Chun, Hosung; Tran, Nhan; Yang, Yuanyuan et al.
2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2012. 2012. p. 3001-3004 6346595 (Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS).

Research output: Chapter in Book/Conference proceeding › Conference contribution › peer-review

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AU - Kavehei, Omid

AU - Bai, Shun

AU - Skafidas, Stan

PY - 2012

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AB - In this paper, we present a precise charge balancing and compliance voltage monitoring stimulator front-end for 1024-electrode retinal prosthesis. Our stimulator is based on current mode stimulation. To generate a precisely matched biphasic current pulse, a dynamic current copying technique is applied at the stimulator front-end. A compliance voltage monitoring circuitry is included at the stimulator front-end to detect if a voltage across electrode-tissue interface goes beyond a predefined compliance voltage. Simulation results show the mismatch of a biphasic current pulse (at a maximum stimulation current of 476μA) is less than 0.1%. Also, the stimulator issues alarm signals, when a voltage compliance occurs during stimulation due to high tissue impedance. Our stimulator is implemented using a 65nm low voltage (LV) CMOS process, which helps reducing implementation area and power consumption.

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Chun H, Tran N, Yang Y, Kavehei O, Bai S, Skafidas S. A precise charge balancing and compliance voltage monitoring stimulator front-end for 1024-electrodes retinal prosthesis. In 2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2012. 2012. p. 3001-3004. 6346595. (Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS). doi: 10.1109/EMBC.2012.6346595

A precise charge balancing and compliance voltage monitoring stimulator front-end for 1024-electrodes retinal prosthesis

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