1 mm3-sized optical neural stimulator based on CMOS integrated photovoltaic power receiver

In this work, we present a simple complementary metal-oxide semiconductor (CMOS)-controlled photovoltaic power-transfer platform that is suitable for very small (less than or equal to 1-2 mm) electronic devices such as implantable healthcare devices or distributed nodes for the Internet of Things. We designed a 1.25 mm x 1.25 mm CMOS power receiver chip that contains integrated photovoltaic cells. We characterized the CMOS-integrated power receiver and successfully demonstrated blue light-emitting diode (LED) operation powered by infrared light. Then, we integrated the CMOS chip and a few off-chip components into a 1-mm(3) implantable optogenetic stimulator, and demonstrated the operation of the device. (C) 2018 Author(s).