A CMOS Chip With Active Pixel Array and Specific Test Features for Subretinal Implantation

Author

Rothermel, Albrecht ; Liu, Liu ; Aryan, Naser Pour ; Fischer, Michael ; Wuenschmann, Juergen ; Kibbel, Steffen ; Harscher, Alex

Author_Institution

Inst. of Microelectron., Univ. of Ulm, Ulm

Volume

44

Issue

1

fYear

2009

Firstpage

290

Lastpage

300

Abstract

This paper presents a CMOS imager chip that is aimed at subretinal implantation for partially restoring human vision. It has low supply voltage (plusmn 2 V) and all DC free terminals for long life wired operation. Stimulation voltage is increased to approximately 4 V_pp by low voltage drop design. 40 x 40 pixel cells including light sensors, amplifiers, control logic and electrode drivers are addressed sequentially to improve power consumption and spatial resolution of perception. Pad count is limited to 6, which requires a specific test procedure. The 3 x 3 mm² design is fabricated in a 0.35 mum CMOS technology optimized for optical performance.

Keywords

CMOS image sensors; prosthetics; visual perception; CMOS imager chip; active pixel array; control logic; electrode drivers; human vision; light sensors; pad count; size 0.35 mum; spatial resolution; subretinal implantation; voltage 4 V; CMOS logic circuits; CMOS technology; Humans; Image restoration; Lighting control; Logic design; Low voltage; Optical amplifiers; Testing; Voltage control; Active pixel array; TiN electrodes; balanced charge injection; logarithmic photo sensor; low input impedance amplifier; polyimide ribbon; restoring visual perception; subretinal implant;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/JSSC.2008.2007436

Filename

4735535