1. Low Power Artificial Retina By Duha Jabakhanji

2. 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.

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

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

5. Design: Pixel One pixel from M. Mazza, P. Renaud, D. C. Bertrand, and A. M. Ionescu, “CMOS Pixels for Subretinal Implantable Prothesis”. Implemented in 0.13u technology. Used the LICOS design.

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

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

9. Design: TVS

10. Results: 10X10 array

11. 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.