202pJ/bit area-efficient ASK demodulator for high-density visual prostheses

A fully integrated low-power and area-efficient ASK demodulator is presented. By using a controllable digital envelope detector and a self-biased clock extractor, the threshold-detection level of the demodulator can be adjusted and the clock from the wireless power carrier can be recovered. This implantable demodulator was fabricated in a 0.35 mu m CMOS process and tested using inductively-coupled coils with a resonant frequency of 13.56 MHz.