Title :
Highly programmable digital controller for high-density epi-retinal prosthesis
Author :
Chen, Kuanfu ; Liu, Wentai
Author_Institution :
Electr. Eng., Univ. of California, Santa Cruz, CA, USA
Abstract :
This paper presents the analysis and circuit design of a digital controller supporting up to 1024-pixel epi-retinal prosthesis. High programmability of each stimulation pixel is desirable to support various physiological conditions. The goal of this design is to achieve high programmability with limited wireless transmission bandwidth. Two-tier architecture is adopted to reduce chip area. Several circuit blocks are developed in this design: on-chip address generator (OCAG) and configuration mode reduce the data bandwidth requirement by 54.7%; flexible data parser enables the optimization between data discard rate and maximum frame rate; delay timer makes any scanning pattern possible. Multi-clock domain and data gating design are used to reduce power. A prototype 256 pixels epi-retinal prosthesis controlled by the proposed digital controller is fabricated in a 0.18mum CMOS HV technology. This digital controller can be used in other implantable multi-channel stimulation systems.
Keywords :
CMOS integrated circuits; biomedical electronics; biomedical telemetry; digital control; eye; handicapped aids; medical control systems; prosthetics; CMOS HV technology; circuit blocks; data bandwidth requirement; data discard rate; data gating design; delay timer; flexible data parser; high-density epiretinal prosthesis; highly programmable digital controller; implantable multichannel stimulation systems; maximum frame rate; multiclock domain design; on-chip address generator; optimization; stimulation pixel; two-tier architecture; wireless data telemetry; wireless transmission bandwidth; Prostheses and Implants;
Conference_Titel :
Engineering in Medicine and Biology Society, 2009. EMBC 2009. Annual International Conference of the IEEE
Conference_Location :
Minneapolis, MN
Print_ISBN :
978-1-4244-3296-7
Electronic_ISBN :
1557-170X
DOI :
10.1109/IEMBS.2009.5334120