Tran N, Yang J, Bai S, Ng D, Halpern M, Grayden D B, Skafidas E, Mareels I
Australia¿s ICT Research Centre of Excellence (NICTA), Victoria Research Laboratory, Parkville, VIC 3010, Australia.
Annu Int Conf IEEE Eng Med Biol Soc. 2009;2009:1643-6. doi: 10.1109/IEMBS.2009.5334239.
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 investigated and measurement result showed a maximum current crosstalk of 8%.
本文介绍了一种采用65纳米互补金属氧化物半导体（CMOS）工艺为1024电极视网膜外假体设计的全柔性刺激器。该刺激器可随时选择任意数量的电极，还支持单极和多极刺激。此外，该刺激器支持广泛的刺激参数。一个新颖的特点是电极驱动器以交替推挽方式工作，这有助于降低净空电压，同时保证有源电极处的电荷平衡。使用正电源而非正负电源简化了CMOS电路设计。研究了两个相邻同时激活电极组之间的电流分布，测量结果显示最大电流串扰为8%。
