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IEEE Symposium on Radio Frequency Integrated Circuits (RFIC)

作者： Qiang Li Wei Li Jinlong Zhang J.S. Yuan Chip Design and Reliability Laboratory School of Electrical Engineering & Computer Science University of Central Florida Orlando FL USA Agere Systems VLSI Technology Laboratory Orlando FL USA

In this paper, CMOS RF down-conversion mixer circuit hot-carrier (HC) and soft breakdown (SBD) reliability estimation and redesign is presented. First of all, MOS transistor reliability under analog operation was evaluated by experiment. The mixer circuit operation conditions for the occurrence of HC and SBD are analyzed, and circuit performance model are presented to relate the device degradation to circuit performance degradation. Finally, we propose mixer circuit redesign strategies, which reduce the HC and SBD problem. Simulation shows improved noise performance with the similar gain, IIP3 and power consumption.

关键词： Electric breakdown Hot carriers Radio frequency Circuit optimization Degradation MOSFETs Circuit analysis Performance analysis Semiconductor device modeling Circuit simulation

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Passive constrained rational approximation algorithm using Nevanlinna-Pick interpolation

Passive constrained rational approximation algorithm using N...

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design, Automation and Test in Europe Conference and Exhibition

作者： C.P. Coelho J.R. Phillips L.M. Silveira Department of Electrical and Computer Engineering INESC / Cadence European Laboratories IST-Technical University of Lisbon Lisboa Portugal Cadence Design Systems Cadence Berkeley Laboratories San Jose CA USA

ISBN: (纸本)0769514715

As system integration evolves and tighter design constraints must be met, it becomes necessary to account for the non-ideal behavior of all the elements in a system. For high-speed digital, and microwave systems, it is increasingly important to model previously neglected frequency domain effects. In this paper, results from Nevanlinna-Pick interpolation theory are used to develop a bounded real matrix rational approximation algorithm. A method is presented that allows for the generation of guaranteed passive rational function models of passive systems by approximating their scattering parameter matrices. Since the order of the models may in some cases be high, an incremental fitting strategy is also proposed that allows for the generation of smaller models while still meeting the required passivity and accuracy requirements. Results of the application of the proposed method to several real-world examples are also shown.

关键词： Approximation algorithms Interpolation Frequency domain analysis Transmission line matrix methods Admittance Circuit simulation Frequency response Laboratories Scattering parameters Time domain analysis

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Topology of the conceptual network of language

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Physical Review E 2002年第6期65卷 065102(R)-065102(R)页

作者： Adilson E. Motter Alessandro P. S. de Moura Ying-Cheng Lai Partha Dasgupta Department of Mathematics Center for Systems Science and Engineering Research Arizona State University Tempe Arizona 85287 Instituto de Física Universidade de São Paulo Caixa Postal 66318 05315-970 São Paulo Brazil Departments of Electrical Engineering and Physics Arizona State University Tempe Arizona 85287 Department of Computer Science and Engineering Arizona State University Tempe Arizona 85287

We define two words in a language to be connected if they express similar concepts. The network of connections among the many thousands of words that make up a language is important not only for the study of the structure and evolution of languages, but also for cognitive science. We study this issue quantitatively, by mapping out the conceptual network of the English language, with the connections being defined by the entries in a Thesaurus dictionary. We find that this network presents a small-world structure, with an amazingly small average shortest path, and appears to exhibit an asymptotic scale-free feature with algebraic connectivity distribution.

关键词： Large scale systems

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Soft breakdown and hot carrier reliability of CMOS RF mixer and redesign

Soft breakdown and hot carrier reliability of CMOS RF mixer ...

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Microwave, MTT-S International Symposium

作者： Qiang Li Wei Li Jinlong Zhang J.S. Yuan Chip Design and Reliability Laboratory School of Electrical Engineering & Computer Science University of Central Florida Orlando FL USA VLSI Technology Laboratory Agere Systems Inc. Orlando FL USA

In this paper, CMOS RF down-conversion mixer circuit hot-carrier (HC) and soft breakdown (SBD) reliability estimation and redesign is presented. First of all, MOS transistor reliability under analog operation was evaluated by experiment. The mixer circuit operation conditions for the occurrence of HC and SBD are analyzed, and a circuit performance model is presented to relate device degradation to circuit performance degradation. Finally, we propose mixer circuit redesign strategies, which reduce the HC and SBD problem. Simulation shows improved noise performance with similar gain, IIP3 and power consumption.

关键词： Electric breakdown Hot carriers Radio frequency Circuit optimization Degradation MOSFETs Circuit analysis Performance analysis Semiconductor device modeling Circuit simulation

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Synchronous interlocked pipelines

Synchronous interlocked pipelines

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International Symposium on Advanced Research in Asynchronous Circuits and systems

作者： H.M. Jacobson P.N. Kudva P. Bose P.W. Cook S.E. Schuster E.G. Mercer C.J. Myers Design Automation Department IBM T.J. Watson Research Center USA High Performance Systems Department IBM T.J. Watson Research Center High Performance Systems Department IBM T.J. Watson Research Center USA Department of Electrical and Computer Engineering University of Utah USA

Locality principles are becoming paramount in controlling advancement of data through pipelined systems. Achieving fine grained power down and progressive pipeline stalls at the local stage level is therefore becoming increasingly, important to enable lower dynamic power consumption while keeping introduced switching noise under control as well as avoiding global distribution of timing critical stall signals. It has long been known that the interlocking properties of as asynchronous pipelined systems have a potential to provide such benefits. However it has not been understood how such interlocking can be achieved in synchronous pipelines. This paper presents a novel technique based on local clock gating and synchronous handshake protocols that achieves stage level interlocking characteristics in synchronous pipelines similar to that of asynchronous pipelines. The presented technique is directly applicable to traditional synchronous pipelines and works equally well for two-phase clocked pipelines based on transparent latches, as well as one-phase clocked pipelines based on master-slave latches.

关键词： Pipelines Clocks Latches Power dissipation Control systems Energy consumption Integrated circuit noise Jacobian matrices design automation Circuit noise

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A modular neural network for vague classification 2nd

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2nd International Conference on Rough Sets and Current Trends in Computing, RSCTC 2000

作者： Auda, Gasser Kamel, Mohamed Electrical and Computer Engineering Department Ryerson Polytechnic University Toronto Canada Systems Design Engineering Department University of Waterloo Waterloo Canada

ISBN: (纸本)3540430741

A modular neural network classifier design is presented. The objective behind the design is to enhance the classification performance of conventional neural classifiers according to two criteria, namely, reducing the classification error, and allowing vague/boundary classification decisions. The proposed model uses an unsupervised network to decompose the classification task over a number of neural network modules. During learning, every module is trained using samples representing the other modules, and modules are trained in parallel. After the training phase, every module inhibits or enhances the responses of the other modules by "voting" for the existence of the input within their decision boundaries. If the result of the majority vote is a "tie", then the sample is classified as a vague class (or boundary) between the (two or more) classes that have the tie. The proposed classifier is tested using a two-dimensional illustrative benchmark classification problem. Results are showing an enhancement in the classification performance according to the above two criteria. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Artificial intelligence

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Synchronous Equivalence: Formal Methods for Embedded systems

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2001年

作者： Harry Chia Chang Hsieh Alberto Luigi Sangiovanni-Vincentelli Felice Balarin

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Considering the alternatives in low-power design

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IEEE Circuits and Devices Magazine 2001年第4期17卷 23-29页

作者： Stouraitis, T. Paliouras, V. Department of Electrical and Computer Engineering University of Patras Greece IEEE Circuits and Systems Society Technical Committee on VLSI Systems and Applications Digital Signal Processing and the Multimedia Systems Committees United States VLSI Design Laboratory ECE Dept. University of Patras Greece Computer Engineering and Informatics Department University of Patras Greece ACM SIAM Technical Chamber of Greece Greece

Recent advances in computer arithmetic offer interesting alternative solutions for low-power design. Depending on an assortment of factors that need to be considered, it is worth evaluating the logarithmic number system (LNS) or the residue number system (RNS) for hardware implementations of computationally intensive tasks. As such, the choice of arithmetic can lead to substantial power savings.

关键词： Integrated circuit layout

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Error analysis for time-interleaved analog channels

Error analysis for time-interleaved analog channels

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2001 IEEE International Symposium on Circuits and systems, ISCAS 2001

作者： Baiying, Yu Black Jr., William C. Analog and Mixed-Signal Design Center Department of Electrical and Computer Engineering Iowa State University Ames IA 50011-3060 United States Agere Systems Allentown PA 18 103 United States

ISBN: (纸本)0780366859

Time-interleaved architectures are frequently employed in high-speed data converters and signal processing channels in order to achieve the highest possible speed. However, the performance of the combined channels is reduced if each channel is not well matched in terms of gain, converter offset and timing skew. In this paper, the errors introduced by gain and offset mismatch and timing skew is analyzed in detail. The digital spectra due to mismatch between channels is derived by applying digital signal processing theories and the closed-forms of signal-to-noise ratio (SNR) are derived and verified using Matlab/sup TM/. © 2001 IEEE.

关键词： Digital signal processing

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Protecting resources with resource control lists

Protecting resources with resource control lists

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Real-Time Technology and Applications Symposium

作者： A. Miyoshi R. Rajkumar Real-time and Multimedia Systems Laboratory Departments of Electrical & Computer Engineering and of Computer Science Carnegie Mellon University USA

ISBN: (纸本)0769511341

Resource management has become an important issue for computer systems as QoS-sensitive multimedia applications and hostile acts such as denial of service (DoS) attacks become widespread. Since applications access the processor, network and other subsystems, attacks on any of these subsystems can lead to undesirable behavior. To maintain system integrity even under such attacks, an unprivileged application must not be allowed to intentionally or unintentionally affect the progress of others. The authors present a first-class abstraction called Resource Control Lists (RCLs) to specify and enforce protection policies on time multiplexed resources, similar to access control on files. RCLs put access control on time multiplexed resources such as CPU time and network and disk bandwidth. RCLs are practical, flexible and provide several benefits. Protection policies specified by RCLs can be under administrator control, customized to a site, and can be dynamically adapted. We have built support for RCLs into Linux/RK, a real-time version of Linux that provides resource reservations where applications receive a promised amount of resources by making reservations. Quantitative measurements with limited forms of DoS attacks show that our new features provide flexible functionality while imposing acceptable overhead without modifying the applications. We also demonstrate that resources are protected even in the face of malicious activities. Finally, we show how RCLs can be used to deliver resource protection on multiple Web server configurations including the hosting of multiple logical sites by an ISP and preferential treatment of buyers on e-commerce sites.

关键词： Protection Resource management computer crime Multimedia systems Application software Linux Operating systems Security Real time systems Laboratories

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