A 13.56 MHz CMOS Active Rectifier With Switched-Offset and Compensated Biasing for Biomedical Wireless Power Transfer Systems

Lü, Yan; Ki, Wing-Hung

doi:10.1109/tbcas.2013.2270177

Cited by 155 publications

(40 citation statements)

References 13 publications

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“…One is to achieve the goal at the circuit level, that is, to improve the efficiencies of each cascading power stages. Taking the active rectifier design as an example, optimizing the size of the cross-connected (CC) transistors can elevate the efficiency level because the parasitic capacitors of the CC transistors are actually part of the resonant tank that do not cause switching loss [31]. The other feasible solution is to reduce the number of converter stages.…”

Section: Discussion and Future Directionsmentioning

confidence: 99%

Wireless Power Transfer System Architectures for Portable or Implantable Applications

Lü

Brian

2016

Energies

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This paper discusses the near-field inductive coupling wireless power transfer (WPT) at the system level, with detailed analyses on each state-of-the-art WPT output voltage regulation topologies. For device miniaturization and power loss reduction, several novel architectures for efficient WPT were proposed in recent years to reduce the number of passive components as well as to improve the system efficiency or flexibility. These schemes are systematically studied and discussed in this paper. The main contribution of this paper is to provide design guidelines for WPT system design. In addition, possible combinations of the WPT building block configurations are summarized, compared, and investigated for potential new architectures.

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Section: Discussion and Future Directionsmentioning

confidence: 99%

Wireless Power Transfer System Architectures for Portable or Implantable Applications

Lü

Brian

2016

Energies

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“…This design was further optimized in 2016 for ultra low power purposes with a PCE of 72% for 19 µW load [98]. In 2014, an improved a switched-offset biasing scheme was proposed by compensating for the delays of the active diodes, which could otherwise cause reverse leakage current [99]. They reached power conversion efficiencies between 82% and 90%.…”

Section: Power Convertersmentioning

confidence: 99%

Low Power Design for Future Wearable and Implantable Devices

Lundager

Zeinali

Tohidi

et al. 2016

JLPEA

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With the fast progress in miniaturization of sensors and advances in micromachinery systems, a gate has been opened to the researchers to develop extremely small wearable/implantable microsystems for different applications. However, these devices are reaching not to a physical limit but a power limit, which is a critical limit for further miniaturization to develop smaller and smarter wearable/implantable devices (WIDs), especially for multi-task continuous computing purposes. Developing smaller and smarter devices with more functionality requires larger batteries, which are currently the main power provider for such devices. However, batteries have a fixed energy density, limited lifetime and chemical side effect plus the fact that the total size of the WID is dominated by the battery size. These issues make the design very challenging or even impossible. A promising solution is to design batteryless WIDs scavenging energy from human or environment including but not limited to temperature variations through thermoelectric generator (TEG) devices, body movement through Piezoelectric devices, solar energy through miniature solar cells, radio-frequency (RF) harvesting through antenna etc. However, the energy provided by each of these harvesting mechanisms is very limited and thus cannot be used for complex tasks. Therefore, a more comprehensive solution is the use of different harvesting mechanisms on a single platform providing enough energy for more complex tasks without the need of batteries. In addition to this, complex tasks can be done by designing Integrated Circuits (ICs), as the main core and the most power consuming component of any WID, in an extremely low power mode by lowering the supply voltage utilizing low-voltage design techniques. Having the ICs operational at very low voltages, will enable designing battery-less WIDs for complex tasks, which will be discussed in details throughout this paper. In this paper, a path towards battery-less computing is drawn by looking at device circuit co-design for future system-on-chips (SoCs). dynamic power consumption, which means that a great deal of the power spent, is wasted solely on heat generation [1]. This can be dealt with by further researching cooling and packaging in order to avoid overheating the circuits; however, this is an expensive and time limited solution, so this paper addresses methods to generally reduce the overall power consumption of the systems.Since the Internet of Things (IoT) revolution, a new focus has been made on making smart phones, smart watches, tablets etc. even smaller whilst increasing the computation power. And with the recent interest in the Internet of Bio-Nano Things (IoBNT) [2], the focus has moved from just increasing the computation power to also creating extremely compact, ultra low power designs that enable small sensors and actuators to operate independently of wired data connections and external power sources. Especially for implanted sensors, the size restriction is crucial for the bio-compatibility and therefore, ...

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“…The most critical part of RFEH circuits is RF rectifier circuits. In RFEH and WPT circuits, many rectifier circuits have been used in the literature . In this study, for the RFEH application, Greinacher full‐wave rectifier circuit was selected.…”

Section: Introductionmentioning

confidence: 99%

Design of an efficiency‐enhanced Greinacher rectifier operating in the GSM 1800 band by using rat‐race coupler for RF energy harvesting applications

Gözel

Kahriman

Kasar

2018

Int J RF Microw Comput Aided Eng

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Radio frequency energy harvesting (RFEH) circuits can convert the power of communication signals from radio frequencies (RF) in the environment into direct current and voltage (DC power). In this study, the Greinacher full-wave rectifier circuit topology was combined with a 180 hybrid ring (rat-race) coupler which was a passive RF/microwave circuit. Thus, higher RF-DC conversion efficiency was obtained. First, using the Greinacher rectifier topology, RFEH circuit operating at the center frequency of 1850 MHz was designed. Then, at this frequency, designing of the rat-race coupler having 1000 MHz bandwidth was made. The S-parameter measurements and simulation data of the designed coupler circuit were compared. Finally, the high efficiency rectifier circuit where these two circuits were used together was designed. The proposed rectifier circuit was constructed on 70 × 70 × 1.6 mm 3 FR4 substrate material with a permittivity of 4.3 (ε r = 4.3). The power conversion efficiency (PCE) of the rectifier circuit, which had 125 MHz bandwidth at the center frequency of 1850 MHz and was developed with rat-race coupler, was calculated as 71% at 4.7 dBm input power. In addition, with this study, at −15 dBm input power, which was a relatively low power level, 40% PCE value was obtained. K E Y W O R D S180 hybrid ring (rat-race) coupler, Greinacher full-wave rectifier, high efficiency rectifier topology

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A 13.56 MHz CMOS Active Rectifier With Switched-Offset and Compensated Biasing for Biomedical Wireless Power Transfer Systems

Cited by 155 publications

References 13 publications

Wireless Power Transfer System Architectures for Portable or Implantable Applications

Wireless Power Transfer System Architectures for Portable or Implantable Applications

Low Power Design for Future Wearable and Implantable Devices

Design of an efficiency‐enhanced Greinacher rectifier operating in the GSM 1800 band by using rat‐race coupler for RF energy harvesting applications

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