Efficiency improvement in photovoltaic-assisted CMOS rectifier with symmetric and voltage-boost PV-cells

Koji Kotani

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Efficiency of the photovoltaic-assisted UHF CMOS rectifier, which is one example realization of the synergistic ambient energy harvesting concept, has been improved by symmetric PV cell structure. Balanced biasing for the n-channel and p-channel diode-connected MOSFETs realized by the symmetric PV cells effectively compensates Vths and prevents useless leakage current, resulting in the improved efficiency of the rectifier under low input power conditions. In addition, by extending the balanced biasing concept, output-voltage-boosted PV cell structure was proposed and found to be effective for further improving the efficiency of the rectifier. As a result, under a typical indoor lighting condition of 300 lx, power conversion efficiency of 25.4% was achieved at -20 dBm of 920MHz RF input and 47 kΩ output loading conditions, being 3.6 times larger than a conventional rectifier without PV assistance.

Original languageEnglish
Pages (from-to)500-507
Number of pages8
JournalIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Issue number2
Publication statusPublished - 2015 Feb 1


  • Energy harvesting
  • Photovoltaic cell
  • Rectifier

ASJC Scopus subject areas

  • Signal Processing
  • Computer Graphics and Computer-Aided Design
  • Electrical and Electronic Engineering
  • Applied Mathematics


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