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A 900-MHz radio-frequency energy harvester is designed and implemented for remotely powered devices. An efficient power path structure with adaptive control is proposed to maintain close-to-optimal power conversion efficiency. The control circuit consumes low power by adopting a novel open-loop asynchronous implementation and duty-cycled operation. A startup circuit is also presented. Measurement results show minimum input available power for startup of 17 dBm. With input available power of 12 dBm and load resistance of 144 , the measured output power is 27.8 , giving an output voltage of 2 V. This corresponds to an end-to-end power conversion efficiency of 44.1%. The harvester consumes quiescent current of 1.56 at output voltage of 2 V.Index Terms-DC-DC boost converter, energy harvesting, full-bridge differential rectifier, passively powered device, power conversion efficiency, radio-frequency energy harvesting, remotely powered device, wireless sensor network, wireless sensor node. 1549-8328

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