GaAs switched capacitor DC-to-DC converter

Al-Kuran, S.; Scheinberg, N.; Saders, J. van

doi:10.1109/4.859500

Cited by 10 publications

(5 citation statements)

References 3 publications

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“…However, linear regulators suffer from an inferior efficiency profile, and these designs do not achieve dynamic voltage regulation. In order to overcome this limited efficiency barrier, switched-capacitor (SC) dc-dc converters have been proposed [7] [8]. The major limitation of many SC converters is the inability to produce the necessary variable conversion ratio (CR).…”

Section: Solutionsmentioning

confidence: 99%

Fabrication processes and experimental validation of a planar PV power system with monolithically embedded power converters

Imtiaz

Khan

2012

2012 IEEE Energy Conversion Congress and Exposition (ECCE)

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This paper summarizes the research outcome intended to identify the most suitable device architecture and its implementation for cell-level power conversion in a photovoltaic (PV) system. The fabrication process to accommodate the power conditioning unit with the PV cells using the same process run have been presented in this paper. Using this method, the entire converter can be embedded with the PV cells producing AC power directly from the solar cell strings. The initial phase of this project simulated various circuit components in the CMOS process, and the project outcome has been summarized in a previous publication by the authors. This paper presents the experimental results of the proposed process, and a simple chopper circuit has been constructed using the embedded MOSFETs and the PV cells. The circuit has been experimentally characterized, along with components. In addition to the process-related challenges and issues, this paper explains the justification of this integration by achieving higher reliability, portability and complete modular construction for PV-based energy harvesting units. To the knowledge of the authors, no attempt has been made to fabricate power converter components with PV cells in the same process run.

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Section: Solutionsmentioning

confidence: 99%

Fabrication processes and experimental validation of a planar PV power system with monolithically embedded power converters

Imtiaz

Khan

2012

2012 IEEE Energy Conversion Congress and Exposition (ECCE)

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“…3, it is clear that the largest ripple occurs at state IV. Thus, (7) can be used to represent the current ripple for D C 0.5. The same analysis can be repeated for D \ 0.5 such that the current ripple can be derived as:…”

Section: Steady State Analysismentioning

confidence: 99%

“…The envelope varying information is restored by modulating the supply voltage of the PA through the output of an envelope modulator. Possible supply modulators include linear low-dropout (LDO) [4][5][6], switched-capacitor converters [7][8][9], switched-mode dc-dc converters [10][11][12], and hybrid-solutions [13,14]. Among previously mentioned approaches, switch-mode DC-DC converters can provide the highest efficiency with acceptable bandwidth.…”

Section: Introductionmentioning

confidence: 99%

High efficiency, high switching speed, AlGaAs/GaAs P-HEMT DC–DC converter for integrated power amplifier modules

Peng

Pala

Wright³

et al. 2010

Analog Integr Circ Sig Process

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This paper presents a high efficiency, high switching frequency DC-DC buck converter in AlGaAs/ GaAs technology, targeting integrated power amplifier modules for wireless communications. The switch mode, inductor load DC-DC converter adopts an interleaved structure with negatively coupled inductors. Analysis of the effect of negative coupling on the steady state and transient response of the converter is given. The coupling factor is selected to achieve a maximum power efficiency under a given duty cycle with a minimum penalty on the current ripple performance. The DC-DC converter is implemented in 0.5 lm GaAs p-HEMT process and occupies 2 9 2.1 mm 2 without the output network. An 8.7 nH filter inductor is implemented in 65 lm thick top copper metal layer, and flip chip bonded to the DC-DC converter board. The integrated inductor achieves a quality factor of 26 at 150 MHz. The proposed converter converts 4.5 V input to 3.3 V output for 1 A load current under 150 MHz switching frequency with a measured power efficiency of 84%, which is one of the highest efficiencies reported to date for similar current/voltage ratings.

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“…Consequently, in order to adapt to low-voltage VLSI systems, several cross-coupled CPs were proposed [5][6][7]. However, an immediate problem arises, due to the poor load regulation, particularly when the converter has a frequently changing load.…”

Section: Introductionmentioning

confidence: 99%

Integrated interleaving SC power converters with analog and digital control schemes for energy-efficient microsystems

Somasundaram

2009

Analog Integr Circ Sig Process

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This paper addresses design strategies and tradeoffs of a series of newly developed interleaving switched-capacitor power converters. In such a design, a converter consists of multiple sub-cells in the power stage, and is regulated with interleaving power flow control. By splitting the power flow in a time-sequenced manner, the converter maintains a continuous power delivery flow to the output V OUT , with significant reductions on the in-rush input current and the output voltage ripples. System modeling and optimization focusing on power efficiency and z-domain closed-loop gain enhancement are discussed. An experimental prototype was successfully fabricated with a standard 0.35-lm digital CMOS N-well process. The entire die area, including fully integrated pads and power devices, is 3.84 mm 2 . Measurement results show that, with a supply voltage of 1.5 V and a load of 250 mA, the output of the converter is well regulated at 2.5 V with 16-mV ripple. The maximum efficiency of 82.3% is achieved at the output power of 625 mW.

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GaAs switched capacitor DC-to-DC converter

Cited by 10 publications

References 3 publications

Fabrication processes and experimental validation of a planar PV power system with monolithically embedded power converters

Fabrication processes and experimental validation of a planar PV power system with monolithically embedded power converters

High efficiency, high switching speed, AlGaAs/GaAs P-HEMT DC–DC converter for integrated power amplifier modules

Integrated interleaving SC power converters with analog and digital control schemes for energy-efficient microsystems

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