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2015 IEEE International Radar Conference, RadarCon 2015

作者： Fellows, Matthew Barlow, Jennifer Flachsbart, Matthew Barkate, Joseph Baylis, Charles Cohen, Lawrence Marks, Robert J. Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University WacoTX United States U.S. Naval Research Laboratory Radar Division WashingtonDC United States

ISBN: (纸本)9781479982325

The Smith Tube, a three-dimensional cylindrical extension of the Smith Chart, provides a mechanism to simultaneously optimize power amplifier circuit and waveform parameters for radar transmitters. A direct, vector-based search algorithm is presented to find the optimum combination of bandwidth and load impedance for a power amplifier to maximize the waveform bandwidth while meeting requirements on the power-added efficiency and the adjacent-channel power ratio. For this optimization, waveform bandwidth is represented on the vertical axis of the Smith Tube, with the complex load reflection coefficient represented in the horizontal plane. Excellent correspondence is obtained in measurement testing of the algorithm from multiple starting combinations of load reflection coefficient and bandwidth. The results of this work are expected to be useful in real-time optimization of power amplifiers for radar and communications. The algorithm is expected to be useful in optimizing the range resolution of radar transmissions. © 2015 IEEE.

关键词： Power amplifiers

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26th Annual Computational Neuroscience Meeting (CNS*2017): Part 3 Antwerp, Belgium. 15-20 July 2017 Abstracts

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BMC NEUROSCIENCE 2017年第SUPPL 1期18卷 95-176页

作者： [Anonymous] Department of Neuroscience Yale University New Haven CT 06520 USA Department Physiology & Pharmacology SUNY Downstate Brooklyn NY 11203 USA NYU School of Engineering 6 MetroTech Center Brooklyn NY 11201 USA Departament de Matemàtica Aplicada Universitat Politècnica de Catalunya Barcelona 08028 Spain Institut de Neurobiologie de la Méditerrannée (INMED) INSERM UMR901 Aix-Marseille Univ Marseille France Center of Neural Science New York University New York NY USA Aix-Marseille Univ INSERM INS Inst Neurosci Syst Marseille France Laboratoire de Physique Théorique et Modélisation CNRS UMR 8089 Université de Cergy-Pontoise 95300 Cergy-Pontoise Cedex France Department of Mathematics and Computer Science ENSAT Abdelmalek Essaadi’s University Tangier Morocco Laboratory of Natural Computation Department of Information and Electrical Engineering and Applied Mathematics University of Salerno 84084 Fisciano SA Italy Department of Medicine University of Salerno 84083 Lancusi SA Italy Dipartimento di Fisica Università degli Studi Aldo Moro Bari and INFN Sezione Di Bari Italy Data Analysis Department Ghent University Ghent Belgium Coma Science Group University of Liège Liège Belgium Cruces Hospital and Ikerbasque Research Center Bilbao Spain BIOtech Department of Industrial Engineering University of Trento and IRCS-PAT FBK 38010 Trento Italy Department of Data Analysis Ghent University Ghent 9000 Belgium The Wellcome Trust Centre for Neuroimaging University College London London WC1N 3BG UK Department of Electronic Engineering NED University of Engineering and Technology Karachi Pakistan Blue Brain Project École Polytechnique Fédérale de Lausanne Lausanne Switzerland Departement of Mathematics Swansea University Swansea Wales UK Laboratory for Topology and Neuroscience at the Brain Mind Institute École polytechnique fédérale de Lausanne Lausanne Switzerland Institute of Mathematics University of Aberdeen Aberdeen Scotland UK Department of Integrativ

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Optimizing radar waveforms using generalized alternating projections

Optimizing radar waveforms using generalized alternating pro...

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Texas Symposium on Wireless and Microwave circuits and systems, (WMCS)

作者： Dylan Eustice Charles Baylis Casey Latham Robert J. Marks Lawrence Cohen Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University Waco TX USA Radar Division United States Naval Research Laboratory Washington DC USA

The radar ambiguity function, described as an autocorrelation of shifts in time and frequency, is useful for determining a waveform's accuracy at detecting targets in certain range-Doppler combinations. An algorithm is proposed which uses a generalized method of alternating projections to synthesize waveforms with desired ambiguity function properties. In practice, it is often desirable to minimize the magnitude of the ambiguity function at range-Doppler combinations where targets other than the detection are likely to cause interference. The algorithm alternates between projections in the time, frequency, and range-Doppler domains until an optimal solution which fits desired ambiguity function properties is found. This work provides a computationally intelligent methodology to dynamically optimize detection in radar applications and a foundation for future work in joint circuit optimization for spectral compliance.

关键词： Minimization Time-frequency analysis Doppler effect Shape Time-domain analysis Radar

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Cuffless Blood Pressure Estimation from the Carotid Pulse Arrival Time using Continuous Wave Radar

Cuffless Blood Pressure Estimation from the Carotid Pulse Ar...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Dilpreet Buxi Jean-Michel Redouté Mehmet Rasit Yuce the Biomedical Integrated Circuits and Sensors (BICS) Laboratory at the Department of Electrical and Computer Systems Engineering Monash University Melbourne Australia work is supported by Australian Research Council Future Fellowships Grant FT130100430

ISBN: (纸本)9781424492695

Ambulatory blood pressure monitors based on pulse transit time are limited by the challenge of changing vascular tone. This study focuses on the use of the carotid artery as an alternative location for arterial pulse acquisition. We use continuous wave radio frequency (RF) radar coupled directly to the body to detect the pulse wave signal. We have shown that the blood pressure-pulse transit time calibration using the carotid pulse is as accurate as that of the radial arterial pulse. The results of this investigation may be useful in developing wearable sensors for long-term monitoring of the pulse wave signal at the carotid artery.

关键词： Carotid Pulse Arrival RF radial arterial pulse carotid artery pulse pulse wave radiofrequency Carotid Arteries Arterial Pulse Continuous Sphygmomanometers Ambulatory Blood Pressure Monitoring arrival time Long term testing Blood Pressure

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25th Annual Computational Neuroscience Meeting CNS-2016, Seogwipo City, South Korea, July 2-7, 2016 Abstracts

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BMC NEUROSCIENCE 2016年第1期17卷 1-112页

作者： [Anonymous] Computational Neurobiology Laboratory The Salk Institute for Biological Studies San Diego USA UNIC CNRS Gif sur Yvette France The European Institute for Theoretical Neuroscience (EITN) Paris France ATR Computational Neuroscience Laboratories Kyoto Japan Krembil Research Institute University Health Network Toronto Canada Department of Physiology University of Toronto Toronto Canada Department of Medicine (Neurology) University of Toronto Toronto Canada Department of Physics University of New Hampshire Durham USA Department of Neurophysiology Nencki Institute of Experimental Biology Warsaw Poland Department of Theory Wigner Research Centre for Physics of the Hungarian Academy of Sciences Budapest Hungary Department of Mathematical Sciences KAIST Daejoen Republic of Korea Department of Mathematics University of Houston Houston USA Department of Biochemistry & Cell Biology and Institute of Biosciences and Bioengineering Rice University Houston USA Department of Biology and Biochemistry University of Houston Houston USA Grupo de Neurocomputación Biológica Dpto. de Ingeniería Informática Escuela Politécnica Superior Universidad Autónoma de Madrid Madrid Spain Department of Biological Sciences University of Southern California Los Angeles USA Center for Neuroscience Korea Institute of Science and Technology Seoul South Korea Department of Neurology Albert Einstein College of Medicine Bronx USA Center for Neuroscience KIST Seoul South Korea Department of Neuroscience University of Science and Technology Daejon South Korea Systems Neuroscience Group QIMR Berghofer Medical Research Institute Herston Australia Department of Psychology Yonsei University Seoul South Korea Department of Psychiatry Kyung Hee University Hospital at Gangdong Seoul South Korea Department of Psychiatry Veterans Administration Boston Healthcare System and Harvard Medical School Brockton USA Department of Electrical and Electronic Engineering The University of Melbourne Parkvil

A1 Functional advantages of cell-type heterogeneity in neural circuits Tatyana O. Sharpee A2 Mesoscopic modeling of propagating waves in visual cortex Alain Destexhe A3 Dynamics and biomarkers of mental disorders Mitsuo Kawato F1 Precise recruitment of spiking output at theta frequencies requires dendritic h-channels in multi-compartment models of oriens-lacunosum/moleculare hippocampal interneurons Vladislav Sekulić, Frances K. Skinner F2 Kernel methods in reconstruction of current sources from extracellular potentials for single cells and the whole brains Daniel K. Wójcik, Chaitanya Chintaluri, Dorottya Cserpán, Zoltán Somogyvári F3 The synchronized periods depend on intracellular transcriptional repression mechanisms in circadian clocks. Jae Kyoung Kim, Zachary P. Kilpatrick, Matthew R. Bennett, Kresimir Josić O1 Assessing irregularity and coordination of spiking-bursting rhythms in central pattern generators Irene Elices, David Arroyo, Rafael Levi, Francisco B. Rodriguez, Pablo Varona O2 Regulation of top-down processing by cortically-projecting parvalbumin positive neurons in basal forebrain Eunjin Hwang, Bowon Kim, Hio-Been Han, Tae Kim, James T. McKenna, Ritchie E. Brown, Robert W. McCarley, Jee Hyun Choi O3 Modeling auditory stream segregation, build-up and bistability James Rankin, Pamela Osborn Popp, John Rinzel O4 Strong competition between tonotopic neural ensembles explains pitch-related dynamics of auditory cortex evoked fields Alejandro Tabas, André Rupp, Emili Balaguer-Ballester O5 A simple model of retinal response to multi-electrode stimulation Matias I. Maturana, David B. Grayden, Shaun L. Cloherty, Tatiana Kameneva, Michael R. Ibbotson, Hamish Meffin O6 Noise correlations in V4 area correlate with behavioral performance in visual discrimination task Veronika Koren, Timm Lochmann, Valentin Dragoi, Klaus Obermayer O7 Input-location dependent gain modulation in cerebellar nucleus neurons Maria Psarrou, Maria Schilstra, Neil Davey, Benjamin Torben-Ni

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Chemofluidic Oscillators: Autonomous Chemical Oscillator Circuit Based on Bidirectional Chemical-Microfluidic Coupling (Adv. Mater. Technol. 1/2016)

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Advanced Materials Technologies 2016年第1期1卷

作者： Georgi Paschew Jörg Schreiter Andreas Voigt Cesare Pini Joseph Páez Chávez Merle Allerdißen Uwe Marschner Stefan Siegmund René Schüffny Frank Jülicher Andreas Richter Polymeric Microsystems Institute of Semiconductors and Microsystems Faculty of Electrical and Computer Engineering and Center for Advancing Electronics Dresden Technische Universität Dresden 01062 Dresden Germany Highly-Parallel VLSI-Systems and Neuromorphic Circuits Institute of Circuits and Systems Faculty of Electrical and Computer Engineering and Center for Advancing Electronics Dresden Technische Universität Dresden 01062 Dresden Germany Polymeric Microsystems Institute of Semiconductors and Microsystems Faculty of Electrical and Computer Engineering and Center for Advancing Electronics Dresden & Research Training Group GRK 1865 “Hydrogel-Based Microsystems” Technische Universität Dresden 01062 Dresden Germany Center for Dynamics Department of Mathematics Technische Universität Dresden 01062 Dresden Germany Facultad de Ciencias Naturales y Matemáticas Escuela Superior Politécnica del Litoral Km. 30.5 Vía Perimetral Guayaquil Ecuador Microsystems Technology Institute of Semiconductors and Microsystems Faculty of Electrical and Computer Engineering Technische Universität Dresden 01062 Dresden Germany Center for Dynamics Department of Mathematics and Center for Advancing Electronics Dresden Technische Universität Dresden 01062 Dresden Germany Max Planck Institute for the Physics of Complex Systems 01187 Dresden Germany Center for Advancing Electronics Dresden Technische Universität Dresden 01062 Dresden Germany

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Measurement-based radar waveform optimization using the ambiguity function and spectral mask

Measurement-based radar waveform optimization using the ambi...

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2014 Texas Symposium on Wireless and Microwave circuits and systems, WMCS 2014

作者： Fellows, Matthew Barlow, Jennifer Barkate, Joseph Mosley, Matthew Flachsbart, Matthew Baylis, Charles Cohen, Lawrence Marks, Robert J. Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University WacoTX United States Naval Research Laboratory Radar Division WashingtonDC United States

ISBN: (纸本)9781479973095

This paper demonstrates the optimization of a radar waveform based on ambiguity function measurements and spectral mask criteria. Compliance with spectral mask criteria is becoming ever-critical in radar systems due to the increased number of devices using the wireless spectrum. The capability of reducing ambiguity at certain range-Doppler combinations is useful in enhancing the detection capability of radar systems. This paper shows the combined optimization for both ambiguity function and spectral mask criteria based on time-domain measurements taken with a high-speed oscilloscope. A benefit of optimizing based on measurements is that the transmitter power amplifier's output waveform can be used, allowing the results of nonlinear distortion to be factored into the optimization process. © 2014 IEEE.

关键词： Power amplifiers

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A Frequency-Sensing Readout using Piezoelectric Sensors for Sensing of Physiological Signals

A Frequency-Sensing Readout using Piezoelectric Sensors for ...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Dilpreet Buxi Jean-Michel Redoute Mehmet Rasit Yuce Biomedical Integrated Circuits and Sensors (BICS) Laboratory at the Department of Electrical and Computer Systems Engineering Monash University

ISBN: (纸本)9781424479276

Together with a charge or voltage amplifier, piezoelectric sensors are commonly used to pick up physiological vibrations from the body. As an alternative to chopper or auto-zero amplifiers, frequency sensing is known in literature to provide advantages of noise immunity, interfacing to digital readout systems as well as tunable range of sensing. A frequency-sensing readout circuit for sensing low voltage signals from piezoelectric sensors is successfully developed and tested in this work. The output voltage of a piezoelectric sensor is fed to a varactor, which is part of an Colpitts LC oscillator. The oscillation frequency is converted into a voltage using a phase locked loop. The circuit is compared to a reference design in terms of linearity, noise and transfer function. The readout has a input-referred noise voltage of 2.24μV/{the square root of}(Hz) and consumes 15 mA at 5V supply. Arterial pulse wave signals and the cardiac vibrations from the chest are measured from one subject to show the proof of concept of the proposed readout. The results of this work are intended to contribute towards alternative low noise analog front end designs for piezoelectric sensors.

关键词： Sensors Noise Phase locked loops Frequency modulation Voltage-controlled oscillators Electrocardiography

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A 100 Gb/s Transimpedance Amplifier in 65 nm CMOS Technology for Optical Communications

A 100 Gb/s Transimpedance Amplifier in 65 nm CMOS Technology...

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IEEE International Symposium on circuits and systems

作者： Maruf N. Ahmed Joseph Chong Dong Sam Ha Multifunctional Integrated Circuits and Systems (MICS) Laboratory Bradley Department of Electrical and Computer Engineering Virginia Tech Blacksburg Virginia 24061 USA

ISBN: (纸本)9781479934331

A 100 Gb/s CMOS transimpedance amplifier (TIA) for high speed optical communication receivers is presented in this paper. The TIA is based on a differential architecture and composed of a regulated cascode block and a differential amplifier with active feedback. It adopts peaking inductors and a capacitive degeneration scheme to increase the bandwidth. The TIA is designed and laid out in CMOS 65 nm CMOS technology. Post layout simulation results show that the TIA achieves 70 GHz bandwidth, 40 dBΩ transimpedance gain, ±4.36 ps of the group delay variation, and 31 pA/(Hz)~(1/2) of the input referred noise current, and it dissipates 24 mW under 1.2V supply. The proposed TIA increases the bandwidth by more than two times when compared with other existing CMOS TIAs, while achieving comparable performance in other performance metrics.

关键词： TIA group input

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Calculation of the radar ambiguity function from time-domain measurement data for real-time, amplifier-in-the-loop waveform optimization

Calculation of the radar ambiguity function from time-domain...

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82nd ARFTG Microwave Measurement Conference: Characterization, Modeling, and Design of RF and mm-Wave Devices and circuits, ARFTG 2013

作者： Fellows, Matthew Baylis, Charles Cohen, Lawrence Marks II, Robert J. Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University Waco TX United States Naval Research Laboratory Radar Division Washington DC United States

ISBN: (纸本)9781467349826

The ambiguity function is a measure of a radar's range and Doppler detection capability. Cognitive radar systems require the capability to adjust the waveform in realtime to obtain desired range/Doppler detection capability while meeting stringent spectral requirements. While the ambiguity function of the waveform input to the transmitter can be simulated, it is the ambiguity function of the transmitter power amplifier's output waveform that will be used for the detection. As such, it is very helpful to be able to measure the ambiguity function output from a power amplifier in the optimization process. This paper describes a technique that can be used to quickly calculate the ambiguity function for the output waveform from the radar amplifier as measured on an oscilloscope. Brief examination is also given to the effect of amplifier nonlinearity on the ambiguity function. © 2013 IEEE.

关键词： Transmitters

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