Power and data for a wireless implanted neural recording system

This paper reports a two-way communication and inductive power link for a neural recording system. For this system a telemetry circuit was designed which utilizes an Integer-N PLL to support multiple outward data channels. The PLL design consumes less than 1.3mW below 100MHz, uses self-biasing techniques for supply rejection, has dimensions of 350um × 680um, and generates frequencies with a phase noise of -83dBc/Hz @100kHz offset, as measured at 80MHz. A wireless demonstration of the implanted circuitry is presented. Wireless powering is achieved with the help of a Class E Converter and demodulation of ASK data sent from the implant at 10Mbps is achieved with a simple asynchronous receiver.