An interface chip for power and bidirectional data telemetry in an implantable cochlear microsystem

A wireless interface chip is described that transfers power, data, and clock from an external system to a cochlear implant and feeds back neural-response and position information. The forward telemetry front-end of the chip is comprised of a multi-output power regulator, wideband FSK data demodulator, and clock recovery circuit. The reverse telemetry back end consists of a Manchester encoder, an on-off keying modulator, and an antenna driver. A data packet checker is also considered to check the format and contents (parity) of the received data.