An 8 Mbps data rate transmission by inductive link dedicated to implantable devices

This paper concerns the design and implementation of a high data rate transmission system over a wireless inductive link. This system, dedicated to medical implantable devices, includes offset quadrature phase shift keying (OQPSK) modulator and demodulator. Both modulator modules feature a reduced complexity, low power, area efficient topologies and allow a high data rate transmission. The demodulator is an improved version from our previous QPSK design, which is based on a modified COSTAS loop. The post layout simulation of the implemented differential topology circuits using a 0.18 mum CMOS technology achieves a data transmission rate of 8 Mbps with 13.56 MHz carrier frequency. The power consumptions of the implemented circuits are 16 muW and 680 muW for the modulator and demodulator respectively with a supply voltage of 1.8 V.