A smart bi-directional telemetry unit for retinal prosthetic device

Author

Bashirullah, Rizwan ; Liu, Wentai ; Ji, Ying ; Kendir, Alper ; Sivaprakasam, Mohanasankar ; Wang, Guoxing ; Pundi, Bharat

Author_Institution

Dept. of Electr. & Comput. Eng., North Carolina State Univ., Raleigh, NC, USA

Volume

5

fYear

2003

Abstract

This paper describes a smart bi-directional telemetry unit for an implantable retinal prosthetic device. The system is designed to deliver 250 mW to the intra-ocular unit via an inductive link and provide wireless communication capability. A novel dual frequency carrier approach is used to optimize the power link for maximum transfer efficiency and the forward telemetry for high data rates. The power link uses a smart feedback system via reverse telemetry to compensate for instantaneous changes in power level due to coil misalignment and load variations. The system is optimized to minimize the power losses in the analog front-end of the intraocular unit while ensuring proper device operation. Preliminary results are shown in AMI 1.6 μm bulk CMOS process for the reverse telemetry and power feedback system.

Keywords

CMOS integrated circuits; biomedical telemetry; circuit feedback; circuit optimisation; circuit simulation; inductive power transmission; integrated circuit design; power control; prosthetic power supplies; radio links; 1.6 micron; 250 mW; CMOS; analog front-end; coil misalignment; dual frequency carrier; high data rate forward telemetry; implantable retinal prosthetic device; inductive link; intra-ocular unit; load variations; maximum transfer efficiency; power feedback system; power level compensation/control; power link optimization; power link smart feedback system; power loss minimization; reverse telemetry; smart bi-directional telemetry unit; wireless communication; Ambient intelligence; Bidirectional control; Coils; Feedback; Frequency; Load management; Prosthetics; Retina; Telemetry; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on

Print_ISBN

0-7803-7761-3

Type

conf

DOI

10.1109/ISCAS.2003.1206158

Filename

1206158