Journal
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
Volume 64, Issue 6, Pages 605-609Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSII.2016.2591543
Keywords
CMOS; energy harvesting; millimeter-wave silicon RFICs; rectennas; transponders; wireless power transfer (WPT)
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The output power level and the power conversion efficiency (PCE) rate of the energy-harvesting systems are vital factors in realizing effective millimeter-wave wireless power transfer solutions that can power battery-less and charge coil-free smart everyday objects. Two 60-GHz energy harvesters that use a tuned complementary cross-coupled oscillator-like rectifying circuitry in 40-nm digital CMOS process are presented. They harvest energy at power rates and peak PCE levels in excess of 1 mW and 30%. These figures are significantly higher than those of the prior art. In one design, two rectifier stages are in a cascode configuration to produce higher dc output voltage levels at the low-current regime. Novel theoretical analyses of the unique rectifying circuitry of the single-stage and two-stage cascode harvesters are presented, which formulate all of the key specifications.
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