A fully integrated DPSK demodulator for high density biomedical implants

This paper presents a fully integrated DPSK demodulator for high density biomedical implants through dual-band telemetry. In order to eliminate the power interference in the data receiver, differential phase shift keying scheme is used, and the power efficiency as well as the data rate is increased by separating the power and data carrier frequency. Furthermore, the minimum sampling rate, which results in reducing the chip size, makes it possible for all functional blocks to be fully integrated on single chip. The demodulator operates at 22 MHz carrier frequency providing 4 Mbps and is fabricated in 0.35 mum CMOS process, with a power consumption of 8.4 mW and an active die area of 1.4times1.0 mm².