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An active rectifier in 6.78MHz resonant-coupling wireless power receivers for space-limited portable and wearable applications is presented. To improve the power efficiency and reduce the die area, a fully NMOS transistor-based active rectifier with a unified delay-locked loop (DLL) controller is proposed. The proposed rectifier has been implemented in a 0.35μm CMOS technology with a die area of 0.612mm2. The measured peak and minimum power efficiency within the power range of 80mw to 440mW are 91.8% and 69.6%, respectively.

A unified DLL-controlled active rectifier in 6.78 MHz resonant-coupling wireless power receivers for space-limited portable and wearable applications