A charge-balanced 4-wire interface for the interconnections of biomedical implants

J. Yang, S. Bai, N. Tran, H. Chun, O. Kavehei, Y. Yang, E. Skafidas, M. Halpern, D. C. Ng, V. Muktamath

Research output: Chapter in Book/Conference proceedingConference contributionpeer-review

3 Citations (Scopus)

Abstract

This paper presents a charge-balanced 4-wire interface on medical platinum wires for biomedical implants. This interface was originally designed to deliver power and full duplex data between implanted units of a retinal prosthesis. Detailed circuits on both sides of the wire interface are depicted. The proposed method ensures the total electrical charge is balanced over time within the implant to avoid the risk of harmful irreversible electrochemical reactions. Experiments show that the data links using this 4-wire interface design has minimal Bit Error Rate (BER) and very low cost in terms of power and area consumptions. The forward data recovery consumes 300 μW at 600 kbps with an area of 15×200 μm2 in 65nm CMOS. The backward data encoding circuit requires an average current of a mere 3 μA at 100 kbps while its area is 15×140 μm2.

Original languageEnglish
Title of host publication2013 IEEE Biomedical Circuits and Systems Conference, BioCAS 2013
Pages202-205
Number of pages4
DOIs
Publication statusPublished - 2013
Externally publishedYes
Event2013 IEEE Biomedical Circuits and Systems Conference, BioCAS 2013 - Rotterdam, Netherlands
Duration: 31 Oct 20132 Nov 2013

Publication series

Name2013 IEEE Biomedical Circuits and Systems Conference, BioCAS 2013

Conference

Conference2013 IEEE Biomedical Circuits and Systems Conference, BioCAS 2013
Country/TerritoryNetherlands
CityRotterdam
Period31/10/132/11/13

ASJC Scopus subject areas

  • Hardware and Architecture
  • Biomedical Engineering
  • Electrical and Electronic Engineering

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