Journal
IEEE ACCESS
Volume 8, Issue -, Pages 79310-79318Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2020.2990662
Keywords
CMOS technology; dual path; power conversion efficiency; reconfigurable; RF-DC power converter; RF energy harvesting
Categories
Funding
- National Research Foundation of Korea (NRF) through the Korea Government (MSIP) [2014R1A5A1011478]
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This paper presents a reconfigurable radio frequency to direct current (RF-DC) converter operating at 902 MHz frequency designed to efficiently harvest RF signals and convert into useable DC voltages for RF energy harvesting applications. The proposed scheme employs a dual-path, a series (lowpower) path and a parallel (high-power) path, to maintain high power conversion efficiency (PCE) over wide input power range. The dual-path is composed of two identical rectifier blocks utilizing internal threshold voltage cancellation (IVC) technique to efficiently compensate the threshold voltage of the transistors used as rectifying devices. An adaptive control circuit (ACC) consisting of a comparator, an inverter and three switches is used in the proposed scheme. The ACC activates the series path or the parallel path to maximize the harvested power based on the input power range. The proposed scheme is designed and fabricated in a 180 nm complementary metal-oxide semiconductor (CMOS) technology. The measurement results show that PCE of the proposed circuit is above 20% from -18 dBm to -5 dBm, maintaining 13-dB input power range with peak PCE of 33% at -8 dBm for 200 k Omega load resistance. The proposed circuit demonstrates -20.2 dBm sensitivity across 1 M Omega load resistance while producing 1 V output DC voltage.
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