A smart bi-directional telemetry unit for retinal prosthetic device - Rizwan Bashirullah; Wentai Liu; Ying Ji; Gurhan Alper Kendir; Mohanasankar Sivaprakasam; Guoxing Wang; B. Pundi (Proceedings of the 2003 International Symposium on Circuits and Systems, ISCAS 2003, Bangkok, Thailand, May 25-28, 2003, 2003)