A wireless data and power recovery for biomedical Microsystems implants

In this paper we present a wireless data and power recovery for biomedical Microsystems implants. Most current systems use discrete components to achieve the back telemetry data and power supply. In order to achieve efficient power consumption and a minimum size of the implant, our RF powering system and data is conceived with MOS transistors in order to have a fully integrated system. Using the signal recovered by the inductive link, the system generates a regulated 3.3V voltage. A novel wireless data and clock recovery architecture is proposed. It consists on a fully integrated noncoherent ASK demodulator unit and a digital Manchester decoder circuit. The demodulator is based on an active component instead of the passive elements, i.e. R or C. This architecture allows data extraction robustness and a low modulation index. The all digital Manchester decoder is designed to recover data and clock from the demodulator output signal. The architecture presented in this paper has been validated by CADENCE simulation software using a standard AMS 0.35μm CMOS technology. Simulations show that the demodulator can be handled at 1Mbps with 10-MHz carrier frequency and 20% modulation index.