A novel non-coherent binary phase shift keying (BPSK) demodulator featuring ultra-low power and high data rate is presented for inductively powered biomedical implants. A self-calibration technique with process variations compensation is proposed in order to minimize the effect of transmitter frequency changes and to enhance circuit robustness. The circuit is designed in the 0.18µm standard CMOS technology. Simulation results show that the demodulator can tolerate a relatively large frequency shift of at least 85% around the centre frequency in all process corners. The power consumption of the demodulator at a data transmission rate of 16Mbps is as low as 9.4µW at a supply voltage of 1.8V, which is much lower compared to other state of the art BPSK demodulators.