A low-power CMOS ASK clock and data recovery circuit for cochlear implants

The ASK modulation is widely adopted in wireless communication and also in bio-implanted system. In this paper, a low-power CMOS ASK clock and data recovery (CDR) circuit is designed for cochlear implants based on the proposed monostable circuit under CMOS 0.18μm technology. This monostable circuit has a great robustness and the transient time only differs 5% under 36°C, and behaves just 10% variety in different PVTs. This monostable circuit uses no resistor and is easy for on-chip integration, it dissipates an average current 16.6μA and 10.1μA when recovers clock from “0” and “1” separately. And the whole CDR circuit could recovery correct clock and data within a broad duty cycle range and consumes only 29.52μW.