An arbitrary waveform stimulus circuit for visual prostheses using a low-area multibias DAC

被引:42
作者
DeMarco, SC [1 ]
Liu, WT
Singh, PR
Lazzi, G
Humayun, MS
Weiland, JD
机构
[1] N Carolina State Univ, Dept Elect & Comp Engn, Raleigh, NC 27695 USA
[2] N Carolina State Univ, Dept Elect & Comp Engn, Raleigh, NC 27695 USA
[3] Univ So Calif, Keck Sch Med, Dept Ophthalmol, Los Angeles, CA 90089 USA
关键词
age-related macular degeneration; digital-to-analog converter (DAC); electrical stimulation; retinal prosthesis; retinitis pigmentosa; visual prosthesis;
D O I
10.1109/JSSC.2003.817264
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Attempts are underway to construct a retinal prosthesis to recover limited vision for blind patients with retinitis pigmentosa using implantable electronic devices. These microchips provide electrical stimulation to damaged retinal tissues using an array of stimulus circuits. This paper describes improvements to conventional circuit designs with significantly decreased implementation area and the ability to support arbitrary stimulus waveforms where an array of such stimulus circuits is required. This yields greater spatial resolution in stimulation owing to more stimulus circuits per chip area. Also introduced are digital-to-analog converter gain prescalar and dc-offset circuits which tune the stimulus circuits to an optimally effective range due to variation in retinal degradation. The prototype chip was fabricated by MOSIS in 1.2-mum CMOS technology.
引用
收藏
页码:1679 / 1690
页数:12
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