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作者： Hou, Chung-Chuan Huang, Yung-Fu Chung Hua University Hsinchu300 Taiwan Industrial Technology Research Institute Hsinchu31040 Taiwan

Hybrid ac/dc microgrids usually utilize an active front-end (AFE) converter between the ac microgrid and the dc microgrid. The advantages of the AFE converter are bidirectional power flow and low total harmonic distortion of the line current. However, the reliability of the AFE converter is rarely respected. This paper proposes a diode rectifier with auxiliary converter for hybrid ac/dc microgrids. The diode rectifier with auxiliary converter realizes the same functionality as the AFE converter with high reliability and low cost. The simulation and test results are presented to validate the performances of the proposed scheme. © 2013 ieee.

关键词： Rectifying circuits

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Non-Invasive On-Chip Light Observation by Contactless Waveguide Conductivity Monitoring

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ieee journal OF selected topics IN QUANTUM ELECTRONICS 2014年第4期20卷 1-10页

作者： Morichetti, Francesco Grillanda, Stefano Carminati, Marco Ferrari, Giorgio Sampietro, Marco Strain, Michael J. Sorel, Marc Melloni, Andrea Politecn Milan Dipartimento Elettron Informaz & Bioingn I-20133 Milan Italy Univ Strathclyde Inst Photon Glasgow G4 0NW Lanark Scotland Univ Glasgow Sch Engn Glasgow G12 8QQ Lanark Scotland

Photonic technologies lack non-invasive monitoring tools to inspect the light inside optical waveguides. This is one of the main barriers to large scale integration, even though photonic platforms are potentially ready to host thousands of elements on a single chip. Here, we demonstrate non-invasive light observation in silicon photonics devices by exploiting photon interaction with intra-gap energy states localized at the waveguide surface. Light intensity is monitored by measuring the electric conductance of the silicon core through a capacitive access to the waveguide. The electric contacts are located at suitable distance from the waveguide core, thus introducing no measurable extra-photon absorption and a phase perturbation as low as 0.2 mrad, comparable to thermal fluctuations below 3 mK. Light monitoring with a sensitivity of -30 dBm and a dynamic range of 40 dB is demonstrated in waveguides and high-Q resonators, and for the tuning of coupled-resonator optical filters. This approach realizes a ContactLess Integrated Photonic Probe (CLIPP), that is simple, inherently CMOS compatible, non-invasive and scalable to hundreds of probing points per chip. The CLIPP concept provides a viable route to real-time conditioning and feedback control of densely-integrated photonic systems.

关键词： Optical monitoring optical resonators optical waveguides photodetectors photonic integrated circuits silicon photonics surface state absorption (SSA)

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Internal power flow of a modular multilevel converter with distributed energy resources

Internal power flow of a modular multilevel converter with d...

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作者： Soong, Theodore Lehn, Peter W. Department of Electrical and Computer Engineering University of Toronto TorontoONM5S 3G4 Canada

This paper examines the internal power flow mechanisms that exist within a generalized modular multilevel converter (MMC) and examines alternatives for integration of distributed energy resources (DERs) within the MMC structure. Each phase leg of the MMC consists of two series connected strings of submodules, where each string of submodules is referred to as a phase arm. Based on analytically developed inter-arm power flow relations, a control methodology is proposed, which provides fully independent control of each arm's real power flow, facilitating extreme levels of inter-arm power transfer. This eliminates the need for uniform integration of DER units across all submodules of the MMC. Among others, viable operating configurations are shown to include DERs only integrated in the upper (or lower) phase arms and DERs integrated only in the upper and lower phase arms of a single phase leg. Power balance is maintained internal to the MMC via dc and ac currents circulating within the converter without distorting input dc or output ac currents. To maximize conversion efficiency, a mechanism for minimizing the necessary circulating ac currents under any inter-arm power flow condition is also identified. Comprehensive simulation results validate both the developed model and controls. © 2013 ieee.

关键词： Rectifying circuits

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emerging Tools in Engineering: Fractional Order Ladder Impedance Models for Respiratory and Neural systems

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ieee journal on emerging and selected topics in circuits and systems 2013年第3期3卷 425-431页

作者： Ionescu, Clara M. Univ Ghent Dept Elect Energy Syst & Automat B-9052 Ghent Belgium

This paper introduces the emerging tool from mathematics in engineering: fractional calculus. Consequently, it enables a novel concept of modelling biological systems by means of preserving the natural rules governing the system's dynamics, i.e., their intrinsic fractal (recurrent) structure. A generally valid ladder network model allows to preserve the anatomy of the system, thereby merging between engineering and medicine. By aid of two original illustrative examples, the advantage and use of these models is explained. Current insight and prospective use for clinical analysis are discussed.

关键词： Fractal structure fractional calculus frequency response ladder network neural networks phase constancy recurrent anatomy respiratory system self-organized critically

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Fractional-Order circuits and systems

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ieee journal on emerging and selected topics in circuits and systems 2013年第3期3卷 297-300页

作者： Elwakil, Ahmed Maundy, Brent Fortuna, Luigi Chen, Guanrong Univ Sharjah Dept Elect & Comp Engn Sharjah 27272 U Arab Emirates Univ Calgary Dept Elect & Comp Engn Calgary AB T2N 1N4 Canada Univ Catania DIEEI Dipartimento Ingn Elettr I-95125 Catania Italy City Univ Hong Kong Dept Elect Engn Kowloon Hong Kong Peoples R China

This special issue offers an opportunity for the circuits and systems community to explore the rapid advances in fractionalorder circuits and systems design and their applications in a number of disciplines. A total of 20 papers have been accepted in this special issue and are arranged to cover threemain themes: fractional-order circuits and systems, fractional-order biomedical models, and fractional-order control. Below is a summary of the contributions under each of these themes.

关键词： Special issues and sections Fractional calculus Continuous time systems

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Closed-Form Rational Approximations of Fractional, Analog and Digital Differentiators/Integrators

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ieee journal on emerging and selected topics in circuits and systems 2013年第3期3卷 322-329页

作者： Maione, Guido Politecn Bari Diparitmento Ingn Elettr & Informaz I-70125 Bari Italy

This paper provides closed-form formulas for coefficients of convergents of some popular continued fraction expansions (CFEs) approximating g(nu), with -1 < nu <1, and (2/T)(nu)((z-1)/(z+1))(nu). The expressions of the coefficients are given in terms of and of the degree of the polynomials defining the convergents. The formulas greatly reduce the effort for approximating fractional operators and show the equivalence between two well-known CFEs in a given condition.

关键词： Analog and discrete fractional-order operators approximation continued fractions fractional-order controllers realization of noninteger order circuits and systems

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Guest Editorial - Advanced circuits and systems for CR/SDR Applications

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ieee journal on emerging and selected topics in circuits and systems 2013年第4期3卷 485-488页

作者： Gomez-Garcia, Roberto Ghannouchi, Fadhel M. Carvalho, Nuno B. Luong, Howard C. Univ Alcala de Henares Dept Signal Theory & Commun Madrid 28871 Spain Univ Calgary Dept Elect & Comp Engn iRadio Lab Calgary AB T2N 1N4 Canada Univ Aveiro Inst Telecomunicacoes P-3810193 Aveiro Portugal Hong Kong Univ Sci & Technol Dept Elect & Elect Engn Analog Res Lab Kowloon Hong Kong Peoples R China

The 15 papers in this special issue have been grouped into four main categories: 1) radio-frequency circuits for CR/SDR (five papers); 2) digital and mixed-mode subsystems for CR/SDR (two papers); 3) receivers and transmitters for CR/SDR (five papers); and 4) signal-processing and communications techniques for CR/SDR (three papers).

关键词： Special issues and sections Cognitive radio Software radio

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Design and Analysis of CMOS-Based Terahertz Integrated circuits by Causal Fractional-Order RLGC Transmission Line Model

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ieee journal on emerging and selected topics in circuits and systems 2013年第3期3卷 355-366页

作者： Shang, Yang Yu, Hao Fei, Wei Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore

A causal and compact fractional-order model is developed for complementary metal-oxide-semiconductor (CMOS) on-chip transmission line (T-line) at Terahertz (THz) frequencies. With consideration of the loss from frequency-dependent dispersion and nonquasi-static effects at THz, good agreement of characteristic impedance is observed between the proposed fractional-order model and the measurement up to 110 GHz, while traditional integer-order model can only match up to 10 GHz. The developed fractional-order model is further deployed in the design and analysis of CMOS-based THz integrated circuits that utilize T-line, such as standing-wave oscillator, which has significantly improved accuracy with causality.

关键词： Causality fractional-order terahertz transmission-line model

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Experimental Evaluation of an Adaptive Nonlinear Interference Suppressor for Multimode Transceivers

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ieee journal on emerging and selected topics in circuits and systems 2013年第4期3卷 602-614页

作者： Habibi, Hooman Janssen, Erwin J. G. Hilkens, Rick G. M. Wu, Yan Milosevic, Dusan Baltus, Peter G. M. Bergmans, Jan W. M. Eindhoven Univ Technol Dept Elect Engn NL-5612 AZ Eindhoven Netherlands

In multimode transceivers, the transmitter for one communication standard may induce a strong interference in the receiver for another standard. Using linear filtering techniques to suppress this interference requires a receiver with a very large dynamic range, leading to an excessive power consumption. A much more power efficient approach suppresses the interference using an adaptive nonlinear interference suppressor (NIS). In previous work an ideal model was used to derive an adaptation method and study the receiver performance afforded by the NIS. In this paper, we present experimental results of a receiver that uses an implementation of the NIS, fabricated in 140 nm complementary metal-oxide-semiconductor technology. Main imperfections that limit the NIS performance are identified, simple models are developed that explain the experimental results, and for the key imperfections, low-complexity digital compensation and calibration methods are proposed. These digital methods permit the use of lower-performance analogue circuits, thus further reducing the transceiver cost and power consumption. The experimental results show that the NIS can achieve a substantial interference suppression at attractive complexity and power dissipation.

关键词： Adaptive circuits adaptive systems co-located transceivers cross-modulation digital compensation interference suppression multimode transceivers nonlinear distortion nonlinear systems

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Design and Applications of a 300-800 MHz Tunable Matching Network

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ieee journal on emerging and selected topics in circuits and systems 2013年第4期3卷 531-540页

作者： Sanchez-Perez, Cesar de Mingo, Jesus Luis Carro, Pedro Garia-Ducar, Paloma Chalmers Univ Technol Dept Microtechnol & Nanosci S-41296 Gothenburg Sweden Univ Zaragoza Aragon Inst Engn Res I3A Zaragoza 50018 Spain Univ Zaragoza Dept Elect & Commun Engn Zaragoza 50018 Spain

In this paper, the optimized design, characterization and applications of a broadband 300-800 MHz (~ 91% fractional bandwidth) digitally-controlled tunable matching network is presented. The design employs PIN diodes as switching components and a repetitive structure of basic cells using lumped reactive elements. After an intensive and complex optimization process, a Smith chart coverage (return losses better than 10 dB and losses lower than 2 dB) above 60% is obtained in all the bandwidth reaching 75% in the middle of the band (400-700 MHz). The potential of the manufactured tunable matching network for antenna mismatch compensation, antenna bandwidth extension and power amplifier efficiency improvement in back-off is showed.

关键词： PIN photodiodes Tunable circuits and devices Impedance matching Cognitive radio Broadband communication Broadband antennas Software radio

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