Biphasic micro LED driver for optogenetics
Optogenetics is a gene therapy technique which utilizes high radiance light to stimulate the genetically modified nerve cells. An optical delivery method in brain tissue for optogenetics can be performed using incorporated micro LEDs. Optrode lifespan can be affected by the electrodes degradation caused by the generated charges over the tissue after long term stimulation. Here, we propose a biphasic LED driving method to balance the charge over the brain tissue. This is done by sending bidirectional pulses and providing different modes of operation for micro LEDs using the designed H tree driver circuit. The proposed structure and included functionalities enable a full range of control on micro LEDs biasing where a tissue ground can provide the needed shielding for the device. The proposed driver is designed using standard 0.35mm CMOS technology.
2016 IEEE Biomedical Circuits and Systems Conference (BioCAS)