2.4-GHz High-Efficiency Adaptive Power

Li, Cheng-Jyun; Lee, Tai-Cheng

doi:10.1109/tvlsi.2013.2238264

Cited by 60 publications

(19 citation statements)

References 8 publications

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“…A common strategy is to use an adaptive rectifier whose configuration changes as a function of the input power level, e.g. using a single-diode rectifier at low input power and multiple diodes rectifier at higher power, so as to generate consistent and non-vanishing η over a significantly extended operating input power range [39], [40]. Third, the diode nonlinearity model accomodates a wide range of multi-carrier modulated and unmodulated input signals and is therefore a function of the input signal power, shape and modulation.…”

Section: ) Antenna and Rectifiermentioning

confidence: 99%

Wireless Information and Power Transfer: Nonlinearity, Waveform Design, and Rate-Energy Tradeoff

Clerckx

2018

IEEE Trans. Signal Process.

198

260

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The design of Wireless Information and Power Transfer (WIPT) has so far relied on an oversimplified and inaccurate linear model of the energy harvester. In this paper, we depart from this linear model and design WIPT considering the rectifier nonlinearity. We develop a tractable model of the rectifier nonlinearity that is flexible enough to cope with general multicarrier modulated input waveforms. Leveraging that model, we motivate and introduce a novel WIPT architecture relying on the superposition of multi-carrier unmodulated and modulated waveforms at the transmitter. The superposed WIPT waveforms are optimized as a function of the channel state information so as to characterize the rate-energy region of the whole system. Analysis and numerical results illustrate the performance of the derived waveforms and WIPT architecture and highlight that nonlinearity radically changes the design of WIPT. We make key and refreshing observations. First, analysis (confirmed by circuit simulations) shows that modulated and unmodulated waveforms are not equally suitable for wireless power delivery, namely modulation being beneficial in single-carrier transmissions but detrimental in multi-carrier transmissions. Second, a multicarrier unmodulated waveform (superposed to a multi-carrier modulated waveform) is useful to enlarge the rate-energy region of WIPT. Third, a combination of power splitting and time sharing is in general the best strategy. Fourth, a non-zero mean Gaussian input distribution outperforms the conventional capacity-achieving zero-mean Gaussian input distribution in multi-carrier transmissions. Fifth, the rectifier nonlinearity is beneficial to system performance and is essential to efficient WIPT design.

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Section: ) Antenna and Rectifiermentioning

confidence: 99%

Wireless Information and Power Transfer: Nonlinearity, Waveform Design, and Rate-Energy Tradeoff

Clerckx

2018

IEEE Trans. Signal Process.

198

260

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“…To evaluate different rectifier architectures, a dynamic range is defined as the input-power range at which the rectifier maintains PCE higher than 80% of its peak efficiency [13].…”

Section: Block Diagrammentioning

confidence: 99%

Self-Biased Differential Rectifier With Enhanced Dynamic Range for Wireless Powering

Ouda

Khalil

Salama

2017

IEEE Trans. Circuits Syst. II

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A self-biased, cross-coupled, differential rectifier is proposed with enhanced power-conversion efficiency over an extended range of input power. A prototype is designed for UHF 433MHz RF power-harvesting applications and is implemented using 0.18µm CMOS technology. The proposed rectifier architecture is compared to the conventional cross-coupled rectifier. It demonstrates an improvement of more than 40% in the rectifier power conversion efficiency (PCE) and an input power range extension of more than 50% relative to the conventional crosscoupled rectifier. A sensitivity of-15.2dBm (30µW) input power for 1V output voltage and a peak power-conversion efficiency of 65% are achieved for a 50kΩ load.

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“…It is because that I out reduces rapidly when R L increases, so dose the current consumed by comparator. The power loss in transistors increases faster than the harvested output power P out [6]. At larger loads the current consumption gets more and more important.…”

Section: Active Diodementioning

confidence: 99%

“…The rectifier in Ref. [6] has large die size and power loss in exchange for good performance. The rectifier in Ref.…”

Section: Active Diodementioning

confidence: 99%

An ultra-low-voltage self-powered energy harvesting rectifier with digital switch control

Zhu

Yang

et al. 2015

IEICE Electron. Express

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This paper presents an ultra-low-voltage high-efficiency interface circuit for energy harvesting, which features self-powered design and digital switch control. The proposed rectifier includes bridge rectifier and active diode. The former introduces self-driven switches and ultra-low voltage divider to reduce the voltage drop for wide output voltage swing. The latter adopts a common-gate comparator as switch control block to output a nearly digital signal, thereby improving dynamic response and antinoise ability. The entire circuit exhibits good conversion efficiency and stability. Its minimum input voltage is down to 225 mV. The maximum voltage efficiency reaches to 96.3%, supplying the output current of 29 µA and the output power of 15.43 µW. The maximum power efficiency is 96.5%, providing the output current of over 16.1 µA and the output power of 5.19 µW. The whole circuit consumes the power loss of 1.42 µW.

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2.4-GHz High-Efficiency Adaptive Power

Cited by 60 publications

References 8 publications

Wireless Information and Power Transfer: Nonlinearity, Waveform Design, and Rate-Energy Tradeoff

Wireless Information and Power Transfer: Nonlinearity, Waveform Design, and Rate-Energy Tradeoff

Self-Biased Differential Rectifier With Enhanced Dynamic Range for Wireless Powering

An ultra-low-voltage self-powered energy harvesting rectifier with digital switch control

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