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International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service (TELSIKS)

作者： Ke Wu Lei Zhu Department of Electrical and Computer Engineering École Polytechnique University of Montreal Canada Laboratories for RF Millimeter Wave Electronics Switzerland

Unified CAD-oriented circuit model is proposed and developed for accurate representation of a variety of planar integrated circuits (ICs). It is realized by implementing a so-called "short-open calibration" (SOC) procedure that uniquely calibrates (de-embeds) the results obtained from a full-wave method of moments (MoM) with two calibration standards: short and open elements. Stemming from the concept of TRL calibration in microwave measurements, this SOC is used to evaluate and to remove unwanted numerical error terms. These error terms mainly come from the approximation of excitation mechanisms in the deterministic 3-D MoM and inconsistently between the 2-D and 3-D MoM-based simulations of uniform line sections. Following a description of our modeling technique related to the SOC and 3-D MoM, different classes of planar structures are characterized in terms of their CAD circuit models that involve all physical effects, such as frequency dispersion, high-order mode effects and unbounded radiation losses. The circuit models developed are very useful not only in gaining physical insight into the electrical behavior of planar structures and also in implementing efficient circuit network-oriented design/optimization approaches. The SOC-extracted circuit parameters are presented for a microstrip interdigital capacitor (IDC) and finite-ground CPW gap structures, which are also well verified by our measurements.

关键词： Radio frequency Integrated circuit modeling Calibration Millimeter wave integrated circuits Millimeter wave technology Moment methods Microwave measurements Integrated circuit measurements Circuit simulation Design automation

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New CMOS instrumentation amplifier dedicated to very low-amplitude signal applications

New CMOS instrumentation amplifier dedicated to very low-amp...

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IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： A. Harb Y. Hu M. Sawan Dept. of Electr. & Comput. Eng. Ecole Polytech. Montreal Que. Canada Department of Electrical and Computer Engineering Ecole Polytechnique de Montreal Montreal QUE Canada Polytechnique Montreal Montreal QC CA

This paper describes a new low-voltage low-power CMOS instrumentation amplifier used, among others, for biomedical applications. Since the nerve signal monitored with this amplifier has very low amplitude and low frequency, it is, at first fed to a low voltage chopper amplifier to reduce the flicker (1/f) noise then amplified with a new programmable, with high CMRR instrumentation amplifier. The design and the simulation results are presented. The layout is drawn in 0.35 /spl mu/m CMOS process with an active area of 0.145 mm/sup 2/. The preliminary test results are consistent with the simulation.

关键词： Instruments Low-noise amplifiers Biomedical monitoring Frequency Low voltage Choppers Voltage fluctuations Noise reduction 1f noise Low-frequency noise

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Evaluating the output probability of Boolean functions without floating point operations

Evaluating the output probability of Boolean functions witho...

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Canadian Conference on Electrical and computer engineering (CCECE)

作者： Yingtao Jiang Yihui Tang Yuke Wang Y. Savaria Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada Department de Genie Electrique et Genie Informatique Ecole Polytechnique Montreal QUE Canada

Recently, two algorithms (M.A. Thornton and V.S.S. Nair, IEEE Trans. computer-Aided Design, Vol. 14, pp. 1328-1341, 1995 ; D.M. Miller, IEEE Trans. computer-Aided Design, Vol. 17, pp. 1328-1341, 1998) have been proposed to calculate the output probability of a Boolean function represented by an OBDD (ordered binary decision diagram). Both algorithms assume that (1) the input variables are equi-probable, and (2) each variable is statistically independent from the others. Under these assumptions, we point out that calculating the output probability is actually identical to computing the number of min-terms of the corresponding Boolean functions. Therefore, simple integer arithmetic (as opposed to the floating point arithmetic involved in Thornton et al.'s and Miller's algorithms) and logic shifts are sufficient to compute the output probability of a Boolean function represented by an OBDD. To compute the output probability of the Boolean functions represented by an OBDD with compacted edge negation, a generalized counting algorithm is also proposed.

关键词： Boolean functions Probability Input variables Arithmetic Data structures Logic circuits Testing Power generation Integrated circuit interconnections Computational complexity

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Turbo decoding using convolutional self doubly orthogonal codes

Turbo decoding using convolutional self doubly orthogonal co...

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1999 IEEE International Conference on Communications, ICC 1999

作者： Cardinal, Christian Haccoun, David Gagnon, François Batani, Nairn Department of Electrical and Computer Engineering Ecole Polytechnique de Montréal P.O. Box 6079 Station Centre Ville MontrealQCH3C 3A7 Canada Department of Electrical Engineering Ecole de Technologie Supérieure 1100 Notre-Dame W. MontrealQCH3C 1K3 Canada

ISBN: (纸本)078035284X

In this paper we present a novel iterative error control technique which circumvents both the complexity and latency shortcomings of the usual Turbo Codes. It differs from usual Turbo coding techniques as it uses a single encoder (hence with no interleaver at the encoding process) and a single decoder. The technique is based on a novel class of orthogonal threshold decodable codes called Convolutional Self Doubly Orthogonal Codes (CSO2C). © 1999 IEEE.

关键词： Turbo codes

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A compact routing technique for communication networks

A compact routing technique for communication networks

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Canadian Conference on Electrical and computer engineering (CCECE)

作者： K. Fath P. Flocchini S. Pierre Department of Computer Science and Operations Research Université de Montreal Montreal QUE Canada Department of Computer Science Université du Quàbec á Hull Hull QUE Canada Department of Electrical and Computer Engineering Ecole Polytechnique de Montrèal Montreal QUE Canada

The authors propose a new compact routing scheme which was first introduced for chordal grids and then generalized to arbitrary networks. Some of the concerns when designing the scheme were the minimization of the storage complexity and the adaptability of the routing scheme to a change of the network and to communication failures. Preliminary experimental results confirm that the algorithm is quite efficient when compared with existing routing techniques.

关键词： Routing Communication networks computer science Algorithm design and analysis Network topology Operations research Costs Labeling

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A 200 MHz frequency-locked loop based on new frequency-to-voltage converters approach

A 200 MHz frequency-locked loop based on new frequency-to-vo...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： A. Djemouai M. Sawan M. Slamani Department of Electrical and Computer Engineering Ecole Polytechnique de Montreal Montreal QUE Canada Universita de QuCbec Université de Québec à MontrCal Montréal Canada

In this paper, we propose a high frequency, fully integrated frequency-locked loop (FLL) design based on a new architecture of a CMOS frequency-to-voltage converter. The design is similar to a phase-locked loop (PLL) in the way that it generates an output signal that tracks an input reference signal, however, in this case the two signals are synchronized in frequency and not in phase. The frequency of the FLL output could be also controlled by an input voltage, therefore, it could be also used as an integrated high-precision voltage-controlled oscillator. The proposed FLL is very fast, operates over a wide frequency range and occupies a small integrated area compared to an equivalent PLL.

关键词： Frequency locked loops Frequency conversion Voltage Phase locked loops Voltage-controlled oscillators Signal generators Circuits Phase frequency detector Low pass filters Signal design

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ART: An architectural reverse engineering environment

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Journal of software Maintenance 1999年第5期11卷 339-364页

作者： Fiutem, Roberto Antoniol, Giulio Tonella, Paolo Merlo, Ettore Italy Department of Electrical and Computer Engineering Ecole Polytechnique C.P. 6079 Succ. Centre Ville Montreal Que. Canada

When programmers perform maintenance tasks, program understanding is often required. One of the first activities in understanding a software system is identifying its subsystems and their relations, i.e., its software architecture. Since a large part of the effort is spent in creating a mental model of the system under study, tools can help maintainers in managing the evolution of legacy systems by showing them architectural information. This paper describes an environment for the architectural recovery of software systems called the architectural recovery tool (ART). The environment is based on a hierarchical architectural model that drives the application of a set of recognizers, each producing a different architectural view of a system or of some of its parts. Recognizers embody knowledge about architectural cliches and use flow analysis techniques to make their output more accurate. To test the accuracy and effectiveness of the ART, a suite of public domain applications containing interesting architectural organizations was selected as a benchmark. Results are presented by showing ART performance in terms of precision and recall of the architectural concept retrieval process. The results obtained show that cliche-based architectural recovery is feasible and the recovered information can be valuable support in reengineering and maintenance activities.

关键词： computer aided software engineering

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A methodology for reusing software components in network design

A methodology for reusing software components in network des...

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Canadian Conference on Electrical and computer engineering (CCECE)

作者： S. Pierre N. Nouisser Department of electrical and computer Engineering École Polytechnique de Montréal Montreal QUE Canada System Development Division Statistique Canada Ottawa ONT Canada

This paper proposes a methodology for reusing graph theory algorithms in telecommunications network design. First, it characterizes the different situations where the basic algorithms of graph theory could be reused. Then, it states the principles for adapting software components by following three main steps: selection, modification and integration. The implementation and test of this methodology show that reusing software components can significantly improve network designers' productivity, as well as the quality of network design software, since the reused components are in general intensively tested in a wide variety of situations.

关键词： Intelligent networks Electronic mail Graph theory software testing software quality software design Algorithm design and analysis Productivity

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Design of a JTAG based run time reconfigurable system

Design of a JTAG based run time reconfigurable system

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Annual IEEE Symposium on Field-Programmable Custom Computing Machines (FCCM)

作者： C. Cousineau F. Laperle Y. Savaria Electrical and Computer Engineering Department Ecole Polytechnique de Montrèal Montreal QUE Canada MiroTech MicroSystems Inc. Saint-Laurent QUE Canada

In the past few years, the concept of run-time reconfigurable (RTR) systems has received a great deal of attention. RTR is the ability for a system to change its hardware configuration while computing, to address changing bottlenecks. This paper proposes a practical and effective means of implementing RTR systems with widely available and proven FPGA technology that keeps most of the practical benefits of RTR at the system level.

关键词： Field programmable gate arrays Engines Bandwidth Control systems Runtime Coprocessors System testing Communication system control Clocks National electric code

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A new approach for handling events in complex applications

A new approach for handling events in complex applications

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Canadian Conference on Electrical and computer engineering (CCECE)

作者： S. Chabou S. Pierre System Development Division Statistics Canada Ottawa ONT Canada Department of Electrical and Computer Engineering École Polytechnique de Montréal Montreal QUE Canada

Many applications related to graphical user interface, multimedia, and communication protocols have been developed using the event-driven programming. This approach of programming is fundamentally different from the procedural approach which can lead, in a GUI application for example, to some structures which are very rigid and hard to maintain and extend, especially when the number of events to be handled is considerable. This is among the reasons why other programming approaches have been proposed. This paper proposes a new approach to handling events in complex applications such as real time and telecommunication applications. This approach is easy to understand and suitable for developing interactive applications.

关键词： Graphical user interfaces Switches Object oriented modeling Protocols Multimedia databases Application software Programming profession Statistics Multimedia communication computer languages

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