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International Conference on Tools for Artificial Intelligence (ICTAI)

作者： H. Beringer B. De Backer IBM France Scientific Center Paris France

Most approaches to model-based diagnosis use incomplete constraint satisfaction techniques and are therefore incomplete. It is shown here how diagnostics may be considered as a general constraint satisfaction problem. Provided the system to be repaired is modeled with piecewise linear constraints on real variables, it is possible to give a clear characterization of the conflict set. Furthermore, a complete algorithm to find every conflict is described. This algorithm is an original and elegant solution to the diagnostic problem. Moreover, it can be used in order to build a compiled form of the initial model. Once this compiled model has been obtained, all the possible faults of a given system can be identified quite easily.< >

关键词： Piecewise linear techniques Programmable control Integrated circuit modeling Resistors Circuit faults Engines electronic circuits Algorithm design and analysis Analog circuits electronic components

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All-silicon plate wave oscillator system for sensor applications

All-silicon plate wave oscillator system for sensor applicat...

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ieee symposium (IUS) Ultrasonics

作者： M.J. Vellekoop A. van Rhijn G.W. Lubking A. Venema Faculty of Electrical Engineering/ Xensor Integration bv Delft University of Technnology Delft Netherlands Faculty of Electrical Engineering Delft University of Technnology USA

The authors present the design and realization of an all-silicon acoustic plate wave oscillator system for sensor applications. The plate wave device and the electronic circuitry have been fabricated in two separate silicon chips. The plate wave device embodies a silicon membrane covered with piezoelectric zinc oxide. For protection of the zinc oxide, a thin silicon nitride layer is deposited on top.< >

关键词： Oscillators Sensor systems and applications Silicon Acoustic sensors Zinc oxide Acoustic applications Acoustic devices Acoustic waves circuits Biomembranes

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design of FIR sampled-data filters for data transmission

Design of FIR sampled-data filters for data transmission

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ieee International symposium on circuits and systems (ISCAS)

作者： H. Baher M. O'Malley Electrical Engineering Department Worcester Polytechnic Institute Worcester MA USA Depertment of Electronic & Electrical Engineering University College Dublin Ireland

A technique is presented for the design of finite-duration-impulse-response (FIR) sampled-data filters which can be used for data transmission as Nyquist channel filters. The filters have zero intersymbol interference in the time domain, as well as linear phase and arbitrary attenuation characteristics in the frequency domain. Compared with more elaborate optimization techniques, the proposed method gives an optimum solution, and it has a number of advantages and features. In the critical case of two samples per baud interval, the resulting filter amplitude response has a remarkable property: if the frequencies of perfect transmission in the passband are specified (or obtained), than, in the Omega -domain, the method results automatically in an equal number of zeros of transmission in the stop band, whose values are the inverses of those at which perfect transmission occurs. This property is akin to that of elliptic filters and is inherent in this special case of the design method.< >

关键词： Finite impulse response filter Data communication Band pass filters Nonlinear filters Intersymbol interference Attenuation Frequency domain analysis Optimization methods Passband Filtering theory

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On exponential fitting for circuit simulation

On exponential fitting for circuit simulation

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ieee International symposium on circuits and systems (ISCAS)

作者： H.C. Neto L.M. Silveira J.K. White L.M. Vidigal Dept. of Electr. Eng. & Comput. Sci. MIT Cambridge MA USA Research Laboratory of Electronics Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA INESC-Instituto de Engenharis de Sistemas e Computadores Lisboa Portugal

Some of the theoretical and practical aspects of using exponential fitting for MOS digital circuit timing analysis are described. The multivariate test problem x=-Ax where A in R/sup n*n/ and is assumed to be irreducibly diagonally dominant with positive diagonals is considered, as this models the equations resulting from the way MOS circuits are treated in timing simulation programs. It is shown that for these problems, the Cinnamon exponentially fit algorithm is A-stable, and an example is given where the algorithm is XPSim is unstable. A semi-implicit version of the XPSim algorithm is described, and it is shown that this semi-implicit algorithm is A-stable. Examination of examples demonstrates that neither the stabilized XPSim algorithm nor the Cinnamon algorithm produces satisfactory results for very large timesteps. The effect of ordering on the accuracy and stability of the integration methods is also examined, and it is shown that ordering always enhances accuracy, though not significantly for large timesteps, and that the XPSim algorithm can be made more stable with a carefully chosen ordering.< >

关键词： Circuit simulation Circuit testing Timing Computational modeling Circuit stability electronic equipment testing Algorithm design and analysis Differential equations Steady-state Jacobian matrices

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Balanced V-band DC-biased mixer with wide (12-GHz) RF/IF bandwidth

Balanced V-band DC-biased mixer with wide (12-GHz) RF/IF ban...

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Microwave, MTT-S International symposium

作者： P. Meier AIL Systems Inc. Melville NY USA

A description is presented of the design and performance of the first balanced DC-biased millimeter-wave mixer with a wide (12-GHz) instantaneous RF/IF bandwidth. Relative to prior mixers, this mixer requires less local oscillator (LO) drive and yet provides the superior intermodulation suppression provided by a balanced design. The mixer includes a unique IF output filter which avoids the reentry problems associated with conventional high/low-Z/sub 0/ designs. The mixer design is applicable to a new generation of electronic warfare systems which cover wide millimeter-wave bands with a small number of mixers and shared LOs.< >

关键词： Radio frequency Bandwidth Band pass filters Millimeter wave technology Coupling circuits Stripline Art Diodes Performance loss Arm

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CAFE-the MIT computer aided fabrication environment

CAFE-the MIT computer aided fabrication environment

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ieee/CHMT(CPMT) International electronics Manufacturing Technology symposium

作者： M.B. McIlrath D.E. Troxel D.S. Boning M.L. Heytens P. Penfield R. Jayavant Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Graphics Technology Division Hewlett Packard Company Fort Collins CO USA

The computer-aided fabrication environment (CAFE) is a software system being developed at MIT for use in the manufacture of integrated circuits. CAFE is intended to be used in all phases of process design, development, planning, and manufacturing of integrated-circuit wafers. The CAFE architectural framework supports a wide variety of software modules, including both development tools and online applications. The key components of the CAFE architecture are the data model and database schema, the process flow and wafer representations, the user interface, and the application programming and database interfaces. All CAFE application modules store and retrieve persistent data through a common database interface layer. Interface wrappers provide seamless, transparent integration of external tools and packages which have their own internal data formats.< >

关键词： Fabrication Application software Databases Computer aided manufacturing Software systems Integrated circuit manufacture Computer integrated manufacturing Process design Process planning Manufacturing processes

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A 5.6-MIPS CALL-HANDLING PROCESSOR FOR SWITCHING systems

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ieee JOURNAL OF SOLID-STATE circuits 1989年第4期24卷 945-950页

作者： HAYASHI, T SAITA, Y OHNO, T MORITA, T FUKUDA, T YOSHIDA, S IKEDA, R System LSI Development Division NEC Corporation Limited Japan

A 32 bit call-handling processor for an electronic switching system (ESS) capable of a 5.6 MIPS instruction execution rate is discussed. The processor uses a mixed architecture consisting of a reduced instruction set computer (RISC) and a complex instruction set computer (CISC) to economize the instruction execution, and features a four-stage two-way pipeline and local storage for the RISC and writable control storage for the CISC. To obtain reliability, availability, and serviceability, such functions as parity check/generation, microdiagnostic, and matcher have been incorporated within the chip. The chip contains about 160 K transistors within a chip size of 13.2*13.7 mm/sup 2/. A 1.2 mu m double-metal CMOS technology has been used. In designing the chip layout, a compromise between manual and automatic placing or routing was adopted which enabled a reasonably short design time.< >

关键词： Switching systems electronic switching systems Computer aided instruction Reduced instruction set computing CMOS technology Computer architecture Pipelines Availability Parity check codes Routing

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TOLERANCES IN SYMBOLIC NETWORK ANALYSIS

TOLERANCES IN SYMBOLIC NETWORK ANALYSIS

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1989 ieee INTERNATIONAL SYMP ON circuits AND systems ( ISCAS )

作者： STARZYK, JA SLIWA, E Ohio Univ Athens OH USA

Tolerances of electronic circuit parameters play an important role in our judgement of circuit functionality. They must be considered both at the circuit design and testing stages. A problem of tolerances in a symbolic network analysis is discussed. Topological analysis combined with operations on discrete random variables allows the behavior of a circuit with toleranced parameters to be predicted. Automatic simplification of symbolic network functions is used to facilitate operations on discrete variables representing network parameters. Illustrative examples are given.

关键词： electronic circuits

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NICE - AN OPTIMIZATION SYSTEM FOR COMPUTER-AIDED-design OF ELECTRICAL circuits

NICE - AN OPTIMIZATION SYSTEM FOR COMPUTER-AIDED-DESIGN OF E...

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1989 ieee INTERNATIONAL SYMP ON circuits AND systems ( ISCAS )

作者： BRAMBILLA, A COTTAFAVA, G GUBIAN, P Dipartimento di Ingegneria Elettrica Univ degli Studi di Pavia Pavia Italy

A description is given of Nice, a general-purpose optimization system that can be coupled to a performance evaluator such as a circuit simulator to provide designers with optimization techniques for the adjustment of the parameters of a design. Nice features a rich library of optimization algorithms as well as a powerful graphics interface. Multiple objectives and functional constraints can be described by means of a specialized optimization language. The coupling of Nice to the SPICE3 circuit simulator is presented, and an example of circuit optimization is shown. Nice exhibits satisfactory results and shows performances better than that of similar systems.

关键词： electronic circuits

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PRACTICAL CONSIDERATION FOR A CONTINUOUS-TIME DIGITAL SPECTRUM ANALYZER

PRACTICAL CONSIDERATION FOR A CONTINUOUS-TIME DIGITAL SPECTR...

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1989 ieee INTERNATIONAL SYMP ON circuits AND systems ( ISCAS )

作者： THONG, T Electronic Systems Laboratory Tektronix Laboratories Tektronix Inc. Beaverton OR USA

The authors propose a paradigm shift for digital spectrum analysis from a transform to a digital filter bank. With the digital filter bank, they gain an additional degree of freedom in the design of the windows, namely, the window length can be specified independently of the DFT length. The authors also explain the problem of measurement aliasing when more than one component fall within the passband of a DFT bin. With this digital filter bank point of view, they design a flat-top window with very sharp roll-off, achieving excellent frequency resolution.< >

关键词： Spectral analysis Signal analysis Signal resolution Bandwidth Performance evaluation Digital filters Laboratories Timing Skin Signal processing

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