Abstract
This paper describes the design and implementation of an implantable microstimulator chip designed for stimulating electrodes in a retinal prosthetic device. The chip is capable of providing biphasic current pulses up to 600μA amplitude to a maximum load of 10kΩ with a anodic/cathodic matching of 1.3%. The current source operates at low voltage headroom of 0.5V by using an active feedback setup. The gain variations for output currents are less than 3%. A 1:8 demultiplexing is used for a stimulus frequency of 50-60Hz. A variable amplification scheme is implemented to maintain a high resolution throughout the entire stimulus range. The outputs are equipped with charge cancellation mechanism to ensure safety of the tissue. Measurement results of a prototype fabricated in AMI 1.6μm bulk CMOS technology are presented.
Original language | English |
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Pages (from-to) | IV-1-IV-4 |
Journal | Proceedings - IEEE International Symposium on Circuits and Systems |
Volume | 4 |
Publication status | Published - 2004 |
Event | 2004 IEEE International Symposium on Cirquits and Systems - Proceedings - Vancouver, BC, Canada Duration: 2004 May 23 → 2004 May 26 |
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering