A Fully-Integrated CMOS Dual-Band RF Energy Harvesting Front-End Employing Adaptive Frequency Selection

Lian, Wen Xun; Ramiah, Harikrishnan; Chong, Gabriel; Churchill, Kishore Kumar Pakkirisami; Lai, Nai Shyan; Mekhilef, Saad; Chen, Yong; Mak, Pui-In; Martins, Rui P.

doi:10.1109/access.2023.3296145

Cited by 9 publications

(1 citation statement)

References 44 publications

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“…On the other hand, Dickson CP has an advantage in high input voltage applications due to its minimal reversion loss. To reduce the conduction loss, some studies have incorporated low voltage threshold (LVT) devices to enhance the performance of charge pumps in subthreshold operation [4], [8], [10]. Nevertheless, the attempt to minimize conduction loss entails a compromise of increased reversion loss, which negatively impacts the charge pump's overall performance.…”

Section: Consists Of An Oscillatormentioning

confidence: 99%

A Subthreshold Operation Series-Parallel Charge Pump Incorporating Dynamic Source-Fed Oscillator for Wide-Input-Voltage Energy Harvesting Application

Kee,

Ramiah,

Churchill

et al. 2023

IEEE Access

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This work proposes a CMOS reconfigurable charge pump (CP) for a low-voltage energy harvesting system. It utilizes the low effective resistance from the parallel CP to enhance its power conversion efficiency (PCE). The CP exhibits an adaptive configuration with different stages depending on the input voltage, changing its voltage conversion ratio (VCR) to limit the output voltage under 1.8-V. Additionally, this work develops a novel dynamic source-fed oscillator that modulates the oscillating frequency by utilizing a dynamic source for the ring-voltage controlled oscillator (RVCO). The independent source from the RVCO and the clock-generating units from the proposed technique permit the implementation of frequency modulation without affecting the clock amplitude. Fabricated in 65-nm CMOS, the proposed prototype measures 62% peak PCE with an input voltage range of 0.26-V to 0.64-V.INDEX TERMS Reconfigurable charge pump (CP), ring-voltage controlled oscillator (RVCO), dc-to-dc converter, low power energy harvesting, CMOS, power conversion efficiency (PCE).

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Section: Consists Of An Oscillatormentioning

confidence: 99%

A Subthreshold Operation Series-Parallel Charge Pump Incorporating Dynamic Source-Fed Oscillator for Wide-Input-Voltage Energy Harvesting Application

Kee,

Ramiah,

Churchill

et al. 2023

IEEE Access

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IRS‐enabled NOMA in energy scavenging underlay networks: Performance analysis

Ho‐Van

2024

Int J Communication

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SummaryBy transmitting concurrently signals of different users, non‐orthogonal multiple access (NOMA) meliorates spectral efficiency. Moreover, intelligent reflective surface (IRS) is introduced as a bridge between a NOMA transmitter and a distant NOMA receiver. This role enhances spectral efficiency and communication reliability. Furthermore, energy scavenging underlay networks (ESUNs) enable unlicensed transmitters to operate using scavenged energy on licensed spectrum allotted to licensed transmitters, enhancing both spectral and energy efficiencies. Although IRS‐assisted NOMA further meliorates spectral efficiency and communication reliability for traditional ESUNs, it faces challenges like fading severity and nonlinear energy scavenging (nlES), which directly impact scavenged energy and communication reliability. Thence, the paper assesses three pivotal performance metrics—energy efficiency, outage probability, and throughput—for IRS‐assisted NOMA in ESUNs, shortly RaNOehU, considering realistic factors such as relatively‐general Nakagami‐m fading and nlES. Demonstrative results reveal that the quantity of reflective elements, fading severity, and nlES dramatically influence the performance of RaNOehU. Notably, appropriate selection of power/time division parameters and desired data rate can hinder complete outage and attain optimum performance. In addition, the proposed IRS‐assisted NOMA is shown to outperform its reference, which is IRS‐assisted orthogonal multiple access, emphasizing the advantages of NOMA.

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Performance evaluation of NOMA networks powered by harvested energy with antenna selection under $$\kappa -\mu $$ shadowed fading

Ho-Van

2024

Telecommun Syst

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A Fully-Integrated CMOS Dual-Band RF Energy Harvesting Front-End Employing Adaptive Frequency Selection

Cited by 9 publications

References 44 publications

A Subthreshold Operation Series-Parallel Charge Pump Incorporating Dynamic Source-Fed Oscillator for Wide-Input-Voltage Energy Harvesting Application

A Subthreshold Operation Series-Parallel Charge Pump Incorporating Dynamic Source-Fed Oscillator for Wide-Input-Voltage Energy Harvesting Application

IRS‐enabled NOMA in energy scavenging underlay networks: Performance analysis

Performance evaluation of NOMA networks powered by harvested energy with antenna selection under $$\kappa -\mu $$ shadowed fading

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