A self-biased cross-coupled differential rectifier is proposed with enhanced power-conversion efficiency (PCE) over an extended range of input power. A prototype is designed for ultrahigh-frequency (UHF) 433-MHz radio-frequency power- harvesting applications and is implemented using a 0.18- μ m CMOS technology. The proposed rectifier architecture is com- pared with the conventional cross-coupled rectifier. It demon- strates an improvement of more than 40% in the rectifier PCE and an input power range extension of more than 50% relative to the conventional cross-coupled rectifier. A sensitivity of − 15.2-dBm (30- μ W) input power for 1-V output voltage and a peak PCE of 65% are achieved for a 50-k Ω load.
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