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A VHF Wide-Input Range CMOS Passive Rectifier with Active Bias Tuning
Li,Xiaofei1,2; Mao,Fangyu1,2; Lu,Yan1,2; Martins,Rui P.1,2
Source PublicationIEEE Journal of Solid-State Circuits

Tiny implantable medical devices in millimeter size demand advanced wireless power solutions that operate at hundreds of megahertz and mainly use passive rectifiers for ac-dc power conversion. A conventional cross-connected (CC) rectifier can operate with high frequency and low input voltage but only achieves good efficiencies in a very narrow input power range, due to the shoot-Through and reverse currents. This work presents a CMOS passive rectifier with active bias tuning (ABT), allowing a widely extended input range with high power conversion efficiency (PCE). In addition, we compensate for the process, voltage, and temperature variations with the ABT scheme that leads to a robust design for very-high-frequency (VHF) operation. Meanwhile, we propose a peak V{\mathrm {OUT}} searching scheme to indicate the charging/discharging directions for the ABT. We obtain a bias-voltage balancing among stacked rectifier stages with a switched-capacitor network. The proposed rectifier is fabricated in a 65-nm CMOS process. Measurement results of three chips show that the proposed rectifier improves the PCE over a wide input range, with an average maximum PCE of 64.4%.

KeywordCharge Pump Cross Connected (Cc) Implantable Medical Device (Imd) Peak Efficiency Searching Rectifier Switched Capacitor Wireless Power Transfer (Wpt)
URLView the original
Indexed BySCIE
WOS Research AreaEngineering
WOS SubjectEngineering, Electrical & Electronic
WOS IDWOS:000572629500001
Scopus ID2-s2.0-85089363271
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Cited Times [WOS]:5   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionFaculty of Science and Technology
Corresponding AuthorLu,Yan
Affiliation1.State Key Laboratory of Analog and Mixed-Signal Vlsi,Institute of Microelectronics,University of Macau,Macao
2.FST-ECE,University of Macau,Macao
First Author AffilicationUniversity of Macau
Corresponding Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
Li,Xiaofei,Mao,Fangyu,Lu,Yan,et al. A VHF Wide-Input Range CMOS Passive Rectifier with Active Bias Tuning[J]. IEEE Journal of Solid-State Circuits,2020,55(10):2629-2638.
APA Li,Xiaofei,Mao,Fangyu,Lu,Yan,&Martins,Rui P..(2020).A VHF Wide-Input Range CMOS Passive Rectifier with Active Bias Tuning.IEEE Journal of Solid-State Circuits,55(10),2629-2638.
MLA Li,Xiaofei,et al."A VHF Wide-Input Range CMOS Passive Rectifier with Active Bias Tuning".IEEE Journal of Solid-State Circuits 55.10(2020):2629-2638.
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