Low Power Artificial Retina By Duha Jabakhanji Objectives

Low Power Artificial Retina By Duha Jabakhanji

Objectives • Design a subretinal implant. • Design a temperature variable supply voltage (TVS). • Integrate the two designs together. • Lower power with increasing temperature. • Examine the effects of temperature on ocular implants.

Challenges • Simulating the artificial retina: photodiode needed. • Simulating a pixel matrix. • Designing the TVS and integrating it with the artificial retina.

Design: Photodiode • Photodiode: – Accurately models a photodiode. – Vary the current source.

Design: Pixel One pixel from M. Mazza, P. Renaud, D. C. Bertrand, and A. M. Ionescu, “CMOS Pixels for Subretinal Implantable Prothesis”. Implemented in 0. 13 u technology. • Used the LICOS design.

Design: Sensor • Temperature sensor: – Used NPN BJT for better resolution.

Design: TVS • The proposed design was too large. • ADC too large to implement. • A subtractor was used instead. Solar Panel Control Circuit A/D converter Temperature Sensor VDD

Design: TVS

Results: 10 X 10 array

Conclusion • • TVS Artificial Retina was a success. Provides a good diagnostic tool. Is self regulatory. Designers should take into consideration varying temperatures and design the implant to withstand it. • Heat damage could be an issue in some cases.