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检索条件"机构=Microelectronics System Design Laboratory-Department of Electrical and Systems Engineering"

共 126 条记录，以下是81-90 订阅

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Analysis of IR-drop scaling with implications for deep submicron P/G network designs

Analysis of IR-drop scaling with implications for deep submi...

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IEEE International Symposium on Quality Electronic design

作者： A.H. Ajami K. Banerjee A. Mehrotra M. Pedram Magma Design Automation Cupertino CA USA Department of Electrical Engineering-Systems University of Southern California Los Angeles CA USA Electrical and Computer Engineering Department University of California슠Santa Barbara Santa Barbara CA USA Computer and System Research Laboratory University of Illinois Urbana-Champaign IL USA

This paper presents a detailed analysis of the power-supply voltage (IR) drop scaling in DSM technologies. For the first time, the effects of temperature, electromigration and interconnect technology scaling (including resistivity increase of Cu interconnects due to electron surface scattering and finite barrier thickness) are taken into consideration during this analysis. It is shown that the IR-drop effect in the power/ground (P/G) network increases rapidly with technology scaling, and using well-known counter measures such as wire-sizing and decoupling capacitor insertion with resource allocation schemes that are typically used in the present designs may not be sufficient to limit the voltage fluctuations over the power grid for future technologies. It is also shown that such voltage drops on power lines of switching devices in a clock network can introduce significant amount of skew which in turn degrades the signal integrity.

关键词： Voltage Land surface temperature Electromigration Conductivity Electrons Scattering Counting circuits Power measurement Switched capacitor networks Resource management

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A hardware implementation of genetic algorithms for measurement characterization

A hardware implementation of genetic algorithms for measurem...

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9th IEEE International Conference on Electronics, Circuits and systems, ICECS 2002

作者： Sharawi, Mohammad S. Quinlan, James Abdel-Aty-Zohdy, Hoda S. Microelectronics System Design Laboratory Electrical and Systems Engineering Oakland University Rochater MI 48309 United States

ISBN: (纸本)0780375963

Integrated circuits that sense, receive, transmit, and process signals are the eye, ears, and nose of the hitechnical field of the millennium. To process/store/analyee signals acquired from sensors, hybrid systems with Rexible and adaptable Intelligent Information Processing and Perception (IIPP) are needed. Genetic Algorithms (GA) present a suitable pre-processing operation hecause of their good convergence to optimum solutions and characterination capabilities. Most of GAs are built via software because of their ease of editing and eustomization. Less attention has been given to hardware implementation of such algorithms. In this paper we present a hardware design approach of a GA for optimum measurements representationjcharacterization to a following IIPP stage. A multilevel verification of the GA is performed via VHDL. In particular the design of efficient universal multipliers and dividers is addressed. A new time efficient approach for Crossover based on preassigned least error value is proposed. The Crossover scheme is called Half Siblings and D Clone. Such a scheme needs 10 iterations to converge the system proposed for sensor measurement characterization. This takes 7680 clock cycles, which is only 96 μsec when implemented in the 0.25 pm CMOS technology. © 2002 IEEE.

关键词： Genetic algorithms

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Analog multiplexing in time domain for biochemical measurement processing

Analog multiplexing in time domain for biochemical measureme...

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Midwest Symposium on Circuits and systems (MWSCAS)

作者： A. Patel T. Terry H.S. Abdel-Aty-Zohdy Microelectronics System Design Laboratory (MSDL) Electrical and Systems Engineering Department Oakland University Rochester MI USA

Digital Multiplexers and Analog multiplexers, through the use of filters and their applications implemented in frequency domain, which requires extensive hardware and is costly have seen substantial amount of research compared to an analog multiplexer in time domain. This Paper Presents design, Simulation, Implementation and Evaluation of a four-to-one analog multiplexer. The analog multiplexer is implemented with the help of four buffers and four transmission gates using 0.35 /spl mu/m CMOS Technology with optimum linear ranges that covers 60% of total input supply voltage. The analog multiplexer is developed for a biochemical preprocessing unit to multiplex time-varying analog input signals coming from real-time sensor arrays and to connect the selected input to one A/D converter for digital implementation of a bio-inspired intelligent signal detection system or to an analog implemented biochemical detection system.

关键词： Time measurement Multiplexing Sensor arrays CMOS technology Intelligent sensors Digital filters Frequency domain analysis Hardware Voltage Data preprocessing

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A hardware implementation of genetic algorithms for measurement characterization

A hardware implementation of genetic algorithms for measurem...

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

作者： M.S. Sharawi J. Quinlan H.S. Abdel-Aty-Zohdy Microelectronics System Design Laboratory Electrical and Systems Engineering Oakland University Rochester MI USA

To process/store/analyze signals acquired from sensors, hybrid systems with flexible and adaptable intelligent information processing and perception (IIPP) are needed. Genetic algorithms (GA) present a suitable pre-processing operation because of their good convergence to optimum solutions and characterization capabilities. Most GAs are built via software because of their ease of editing and customization. Less attention has been given to hardware implementation of such algorithms. We present a hardware design approach of a GA for optimum measurement representation/characterization to a following IIPP stage. A multilevel verification of the GA is performed via VHDL. In particular the design of efficient universal multipliers and dividers is addressed. A new time efficient approach for crossover based on preassigned least error value is proposed. The crossover scheme is called half siblings and a clone. Such a scheme needs 10 iterations to converge the system proposed for sensor measurement characterization. This takes 7680 clock cycles, which is only 96 /spl mu/sec when implemented in the 0.25 /spl mu/m CMOS technology.

关键词： Hardware Genetic algorithms Intelligent sensors Sensor phenomena and characterization Sensor systems CMOS technology Information analysis Signal analysis Signal processing Information processing

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Signal perception and processing with bio-inspired sub-micro-systems

Signal perception and processing with bio-inspired sub-micro...

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2002 45th Midwest Symposium on Circuits and systems

作者： Abdel-Aty-Zohdy, Hoda S. Ewing, Robert L. Microelectronics System Design Lab. Department of Electrical Engineering Oakland University Rochester MI 48309 United States Information Directorate Air Force Research Laboratory Wright-Patterson AFB OH 45433 United States

Bio-inspired systems utilizing neural networks and genetic algorithms are presented in this paper for applications in pattern discovery, identification, classification, and optimum choices for Signal Perception and Processing (SPP), Sample overview applications are presented for: (I) Integrated Intelligent E-Nose systems, and (II) Communication systems dealing with: (1) Connection admission control;(2) Network congestion;(3) Resource management;(4) Priorities and constrains of service control;and (5) Application-specific network adaptation. Bio-inspired systems include: i-Self-Organizing feature Map for discovery, ii- Recurrent Dynamic Neural Networks (NNs), with output neurons feedback and feed forward arrays for noisy signals, iii- Reinforcement NNs for applications with only key features, rather than a known model, iv- Spiking NNs that adjust their synapses subject to changes in the environment, and v- Genetic Algorithms for characterization and optimization. This paper summarizes alternative combinations and structures of novel bio-inspired, VLSIC embedded systems for detection and quantification of bio-chemical agents, and optimum performance of SPP.

关键词： Signal processing

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New genetic algorithm approach for dynamic biochemical sensor measurements characterization

New genetic algorithm approach for dynamic biochemical senso...

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Midwest Symposium on Circuits and systems (MWSCAS)

作者： D. Gantla H.S. Abdel-Aty-Zohdy R.L. Ewing Microelectronics System Design Laboratory Department of Electrical & Systems Engineering Oakland University Rochester MI USA Wright Patterson Air Force Base OH USA

In an olfaction system (E-Nose) hardware implementation, outputs from the GA approach are used as inputs to an intelligent neural network system for biochemical detection and decision-making. In this paper we present a Genetic Algorithm for measurement characterization with dynamic inputs. Input measurements are from a given range and are assumed in parallel from chemical-sensor array. An input multiplexer/controller/Analog-Digital converter preprocessing stage is used to control these input measurements. The new dynamical approach presents measurement characterization and also optimum fused measurements without loosing the integrity of incoming signals. Through a novel mutation and crossover approach (Half Sibling and A Clone) optimum characteristic weight chromosomes are achieved. HSAC represents both crossover and mutation. A key feature of the new approach is that no pre-assigned minimum error is specified, rather error is dynamically evaluated based on measurements. Simulation results of the new GA with dynamic measurements are compared with one of the approaches from GAlib (A library of genetic Algorithm approaches from MIT) and proved the new approach has minimum error and a early convergence. MATLAB has been used as the simulation tool.

关键词： Genetic algorithms Biosensors Genetic mutations Neural network hardware Intelligent systems Intelligent networks Intelligent sensors Neural networks Decision making Chemicals

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A wavelet-based measurement of signal fractal dimensions

A wavelet-based measurement of signal fractal dimensions

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Canadian Conference on electrical and Computer engineering (CCECE)

作者： A.Z.R. Langi H.B. Nugraha Laboratory for Signals and Systems Department of Electrical Engineering and IC Design Laboratory IURC Microelectronics DSP Research and Technology Group Bandung Institute of Technology Bandung Jawa Barat Indonesia

This paper describes a study of measuring signal fractal dimensions (especially in a form of Lipschitz exponents /spl gamma/) using wavelets. The procedure is as follows. Given a one-dimensional signal f(t) and its corresponding wavelet transform (at a scale a and a position b) as W/sub f/(a, b), we find wavelet maxima lines l(a, b) and their corresponding wavelet maxima |W/sub f/(a, b)|. Suppose the signal f(t) has a Lipschitz exponent /spl gamma/ at t=b/sub 0/, and there is a maxima line l(a,b) reaching b/sub 0/ as a/spl rarr/0. The corresponding wavelet maxima in the line satisfy an inequality |W/sub f/(a, b)|/spl les/Ca/sup /spl gamma/+0.5/ for some constant C and a/spl rarr/0. A log-log plot on the inequality estimates the Lipschitz exponent /spl gamma/. We have performed an experiment of the procedure for f(t)=1-|0.5-t|/sup /spl gamma//, where the Lipschitz component /spl gamma/ varies from 0.1 to 0.9 at a 0.1 interval. The procedure provides relatively good estimates for 0.5/spl les//spl gamma//spl les/0.9, with relative errors less them 10%.

关键词： Fractals Wavelet transforms Signal processing Laboratories Signal processing algorithms Digital signal processing Microwave integrated circuits Signal design microelectronics Electric variables measurement

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Formal verification and performance evaluation of logic integrated systems based on hierarchical analysis

Formal verification and performance evaluation of logic inte...

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Midwest Symposium on Circuits and systems (MWSCAS)

作者： F.A. El-Licy H.S. Abdel-Aty-Zohdy Microelectronics System Design Laboratory Department of Electrical and Systems Engineering Oakland University Rochester MI USA

ISBN: (纸本)078037150X

Formal verification of very large scale integrated circuit (VLSIC) involves the formal correctness of the functionality of a given design, while circuit validation involves the reliability and efficiency of the design. A hierarchical approach for computation, of IC design efficiency is proposed and implemented using figures of merit. The work has been motivated to partially complete an IC formal verification tool. The implemented system is integrated into a formal verification environment to reflect the performance of the verified system. The system is capable of analyzing the power dissipation and figures of merit using equivalent R and C components. The hierarchical analysis and evaluation of figures of merit general factors obtained at different system levels represent performance evaluation of each gate. An illustrative example of a 6/spl times/6 carry look-ahead adder is given and worst case conditions have been determined. The system performance may thus be improved.

关键词： Formal verification CMOS logic circuits Binary trees Power dissipation Semiconductor device modeling Laboratories Performance analysis Switches Delay effects Logic design

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Optimal-weights sensors-measurement fusion using genetic algorithms

Optimal-weights sensors-measurement fusion using genetic alg...

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Midwest Symposium on Circuits and systems (MWSCAS)

作者： M.S. Sharawi H.S. Abdel-Aty-Zohdy R.L. Ewing Microelectronics System Design Laboratory Electrical and Systems Engineering Oakland University Rochester MI USA US Air Force Research Laboratory Dayton OH USA

ISBN: (纸本)078037150X

Although there are many simulated Genetic Algorithms (GAs) in applications, less research has been directed toward their practical hardware implementations. In this paper we present a GA for optimum sensors-measurement fusion and characteristic weights. A multilevel verification of the GA is performed via the Mentor Graphics design Architect (DA) and ModelSim CAD tools. In particular the design of efficient universal multipliers, dividers, and their integrated circuits is addressed. Effective mutation and crossover approach has been implemented in the GA system operation. It requires 960 clock cycles for complete iteration of 64 chromosomes, each with 3 genes of two binary-bits. This requires only 12 /spl mu/sec when implemented in the 0.25 /spl mu/m CMOS technology. The GA system is developed for a preprocessing unit to select optimal weights from real-time sensors measurement, and for fused measurements as in an electronic nose, integrated accelerometer systems, and for performance enhancement of recurrent dynamic neural networks in noisy environments. The proposed approach, simulation results, and possible experimental results are presented.

关键词： Genetic algorithms CMOS technology Hardware Graphics design automation Genetic mutations Clocks Biological cells Integrated circuit technology Real time systems

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design approach for biomedical smart sensors

Design approach for biomedical smart sensors

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Midwest Symposium on Circuits and systems (MWSCAS)

作者： R.L. Ewing H.S. Abdel-Aty-Zohdy Air Force Research Laboratory Inforamation Directorate Adjunct Professor Department of Electrical and Computer Engineering Air Force Institute of Technology USA Microelectronics System Design Laboratory Department of Electrical and Systems Engineering Oakland University Rochester MI USA

ISBN: (纸本)078037150X

system-on-Chip solid state circuits that sense, receive, transmit, and process signals are the sensors, or eyes and ears, of the medical field of the millennium. The goal and design of the system-on-Chip (SOC) program for industry will be to provide affordable, reproducible, and reliable front-end instrumentation, components and subsystems for medical systems. To process/store/analyze the signals acquired from these medical sensors, analog/digital systems are used to provide data fusion and information extraction. These biomedical smart sensors cover the hybrid domains of mixed-technology (electrical, mechanical, optical, thermal, biochemical) and mixed-concept (electrical, control, digital signal processing). These significant domain design differences impose robust design challenges for medical sensor technology.

关键词： Intelligent sensors Biosensors system-on-a-chip Signal processing Sensor systems Mechanical sensors Solid state circuits Eyes Ear Instruments

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