A fully flexible stimulator using 65 nm CMOS process for 1024-electrode epi-retinal prosthesis.

N Tran; J Yang; S Bai; D Ng; M Halpern; DB Grayden; E Skafidas; I Mareels

Conference Proceedings

A fully flexible stimulator using 65 nm CMOS process for 1024-electrode epi-retinal prosthesis.

N Tran, J Yang, S Bai, D Ng, M Halpern, DB Grayden, E Skafidas, I Mareels

Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference | Published : 2009

DOI: 10.1109/IEMBS.2009.5334239

Abstract

This paper presents a fully flexible stimulator using 65 nm CMOS process for a 1024-electrode epi-retinal prosthesis. The stimulator can select any number of electrodes at any time and also supports both mono-polar and multi-polar stimulation. Furthermore, the stimulator supports a wide range of stimulus parameters. A novel feature is that the electrode driver operates in an alternately pull-push manner, which helps reduce headroom voltage while guaranteeing charge balance at the active electrode. The use of positive supplies instead of both positive and negative supplies simplifies CMOS circuit design. The current distribution between two nearby simultaneously active electrode groups was in..

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