Fully integrated CMOS data and clock recovery for wireless biomedical implants

In order to minimize the size and improve the efficiency of power consumption, most of wireless implantable Microsystems use Amplitude Shift Keying (ASK) modulator to transmit, through a RF link, data and energy to the internal implants. In this paper, we propose a new structure of wireless data and clock recovery dedicated for biomedical implants. It consists in a fully integrated ASK demodulator unit and a digital Manchester decoder. The demodulator is based on active components instead of the passive elements, as resistance or capacitance, to extract a robust data with a low modulation index. The whole digital Manchester decoder intends to recover data and clock from the demodulated signal. The following design has been validated by CADENCE environment using Specter simulation in a standard AMS 0.35μm CMOS process. The data rate is simulated by 1Mbps speed for 10MHz carrier frequency and 20% modulation index.