Title :
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
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 Vpp 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;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2008.2007436
