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SPEED: fast and efficient timing driven placement

SPEED: fast and efficient timing driven placement

引用

ieee International symposium on circuits and systems (ISCAS)

作者： B.M. Riess G.G. Ettelt Institute of Electronic Design Automation Technical University Munich Munich Germany

A timing driven placement approach for very large circuits is described. A new method for accurate net delay estimation allows to calculate an individual delay between the source pin and each sink pin of a net. The obtained timing information drives an efficient net-based placement technique, which dynamically adapts the net weights during successive placement steps. For the first time, results of benchmark circuits with up to 25,000 cells are presented. They show an excellent quality in terms of maximum path delay and total area after final routing. The maximum path delay of the examined circuits is reduced by 26% on an average, at an area cost of only 1% compared to the timing driven placement tool RITUAL 3.4.

关键词： Timing Delay estimation Pins electronic circuits Silicon Upper bound electronic design automation and methodology Routing Costs Very large scale integration

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design of FIR digital filters with minimum weight representation

Design of FIR digital filters with minimum weight representa...

引用

ieee International symposium on circuits and systems (ISCAS)

作者： M. Yagyu T. Yoshida A. Nishihara N. Fujii Tokyo Institute of Technology Tokyo Japan Tokyo Kogyo Daigaku Meguro-ku Tokyo JP Tokyo Inst. of Technol. Japan

This paper proposes an algorithm for the iterative design of FIR digital filters whose coefficients have minimum weight representation. The total number of nonzero bits is limited. In each iteration the coefficient vector is up-dated so that some sets of the amplitude ripples become smaller. The direction is found by solving linear simultaneous equations. The method evaluates the normalized peak ripples in the minimax sense. Several examples show that the proposed method yields superior filter responses compared to the conventional methods.

关键词： Finite impulse response filter Digital filters Frequency response Equations Minimax techniques Computational efficiency Algorithm design and analysis electronic mail Iterative algorithms Vectors

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Isotropic quadratic filter design using the discrete cosine transform

Isotropic quadratic filter design using the discrete cosine ...

引用

ieee International symposium on circuits and systems (ISCAS)

作者： G. Deng L.W. Cahill Department of Electronic Engineering La Trobe University Bundoora VIC Australia

The problems associated with applying the discrete cosine transform (DCT) to the design and implementation of the 1-D isotropic quadratic filter are investigated in this paper. A DCT implementation of the filter is proposed and its computational complexity is analysed. The advantage of the DCT implementation is illustrated by a nonlinear system modelling problem. Results show that the DCT implementation converges faster than the direct implementation.

关键词： Discrete cosine transforms Kernel Computational complexity Symmetric matrices Nonlinear systems Image processing Nonlinear filters Vectors Matrix decomposition design engineering

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A generalized electromagnetic optimization procedure for the design of complex interacting structures in hybrid and monolithic microwave integrated circuits

A generalized electromagnetic optimization procedure for the...

引用

Microwave, MTT-S International symposium

作者： M.A. Schamberger A.K. Sharma Motorola Inc. Schaumburg IL USA RF Product Center Electronic Systems and Technology Division TRW Redondo Beach CA USA

An adaptive electromagnetic optimization procedure to facilitate field-theoretic design of hybrid and monolithic integrated circuits is presented. This approach provides full-wave characterization of complex MIC and MMIC geometries by including various effects such as coupling, spurious radiation, surface wave modes, and interactions with package modes. Application of this procedure utilizing commercially available electromagnetic simulators is presented to demonstrate its versatility.< >

关键词： design optimization Electromagnetic radiation Electromagnetic fields Monolithic integrated circuits Microwave integrated circuits Field effect MMICs Computational geometry Coupling circuits Surface waves Integrated circuit packaging

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A HDTV-suited architecture for a full search block-matching algorithm

A HDTV-suited architecture for a full search block-matching ...

引用

ieee International symposium on circuits and systems (ISCAS)

作者： S. Honken Feng-Ming Yang R. Laur Institute for Microelectronics University of Brethemen Bremen Germany

This paper describes an architecture based on a new full search block-matching algorithm called vector-characterization algorithm (VCA). A single-chip realization in form of a 1.0 /spl mu/m CMOS standard cell design s... 详细信息

关键词： Computational complexity Computer architecture Image coding HDTV Microelectronics electronic mail Motion estimation Image sequences Digital images TV

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A new algorithm for sorting problem with reformed CAM

A new algorithm for sorting problem with reformed CAM

引用

ieee International symposium on circuits and systems (ISCAS)

作者： Kuei-Ming Lu K. Tamaru Department of Electronic Engineering Kyoto University Kyoto Japan

Nowadays, the addition of specific hardware to CAD or DA applications has been received by the engineering community. Specially, Content Addressable Memory (CAM) is in the limelight because of its fast processing capability. In this paper, we propose a new algorithm and reformed CAM to deal with the sorting problem that always takes the bulk of the execution time in some applications such as design-rule checking. They can effect an 80% reduction in retrieval times.

关键词： Sorting Computer aided manufacturing CADCAM Logic Information retrieval Counting circuits Decoding

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Optimizing the design of switch-mode power supplies with battery back-up and power factor correction

Optimizing the design of switch-mode power supplies with bat...

引用

ieee International symposium on circuits and systems (ISCAS)

作者： Y.S. Lee K.W. Siu Xuan-Zhong Liu Department of Electronic Engineering Hong Kong Polytechnic University Hong Kong China CAD Communication Component Company Limited Zhuhai China

Regulatory standards such as IEC555-2 require switch-mode power supplies (SMPS) to have a high power factor. The addition of a power-factor-correction (PFC) pre-regulator to an SMPS may enable it to meet the regulatory requirement. But this is, in most cases, not an optimum design. Based on the example of a power supply system for telecommunication applications, a method to optimize the overall design is presented in this paper. In the new design the need for a separate SMPS (in addition to the PFC pre-regulator) is eliminated. Computer simulations are presented to show that the new design approach is possible and practical.

关键词： design optimization Emergency power supplies Batteries Power factor correction Switched-mode power supply Voltage circuits Reactive power Regulators Filtering

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Suppression of spurious responses for a class of neural networks with application to telecommunications problems

Suppression of spurious responses for a class of neural netw...

引用

ieee International symposium on circuits and systems (ISCAS)

作者： R. Fantacci M. Forti A. Liberatore S. Manetti M. Marini Electronic Engineering Department University of Florence Florence Italy

This paper discusses the design of a neural network for solving some classes of combinatorial optimization problems in real time. By means of a suitable design procedure which is not based on energy arguments, it is guaranteed that the network is devoid of spurious responses. An important application is considered to a typical optimization problem arising in the telecommunications field. More specifically, we show how the neural network can be used to take decisions for switching packets and improve switching performance in a fast packet switching fabric with input buffers.

关键词： Neural networks Telecommunications Neurons Linear matrix inequalities Output feedback Neurofeedback Differential equations Convergence Steady-state design optimization

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Estimating key parameters in the EKV MOST model for analogue design and simulation

Estimating key parameters in the EKV MOST model for analogue...

引用

ieee International symposium on circuits and systems (ISCAS)

作者： G.A.S. Machado C.C. Enz M. Bucher Department of Electrical and Electronic Engineering Imperial College of Science Technology and Medicine London UK Laboratory dE28099Électronique Générale EPFL-Ecublens École Polytechnique Fédérale de Lausanne Lausanne Switzerland

Recent availability of the public-domain EKV (Enz-Krummenacher-Vittoz) MOST model from EPFL in a number of circuit simulators facilitates the intuitive design, analysis and simulation of analogue and mixed-mode circuits and systems exploring the numerous modes of operation of the MOST, particularly at low-voltage (LV) and low-current (LC). A practical approach for either extracting the most critical parameters and/or adapting those already available from widely used SPICE models (levels 2 and 3) for use with the EKV model is presented and opportunities for engineering education are considered. The effectiveness of the approach is illustrated by measured results from CMOS and BiCMOS technologies.

关键词： Parameter estimation Analytical models Circuit simulation Semiconductor device modeling CMOS technology Availability circuits and systems SPICE Engineering education BiCMOS integrated circuits

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design constraint on feedback gain vector of switching regulators for local stability

Design constraint on feedback gain vector of switching regul...

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ieee International symposium on circuits and systems (ISCAS)

作者： H. Chung A. Ioinovici Department of Electrical Engineering Hong Kong Polytechnic University Hong Kong China Holon Institute of Technological Education Israel

A discrete-time dynamic model of closed-loop switched mode electronic regulators is derived. No small-ripple approximations are required. The same model serves for both local and global stability study: by discarding the nonlinear terms (like products of small-signal perturbations in the converter state variables) and using the z-transform, a local stability criteria is formulated. Applying the condition that the eigenvalues of the z-domain characteristic matrix have to be situated inside the unit circle, a design constraint on the feedback gains is found. An example of a boost converter operating in continuous conduction mode with inductor current and output voltage feedback is presented.

关键词： Feedback Regulators Voltage Inductors Circuit stability Equations Capacitors Stability criteria Matrix converters Power electronics

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