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A 1V, 1mW, 4GHz Injection-Locked Oscillator for High-Performance Clocking

A 1V, 1mW, 4GHz Injection-Locked Oscillator for High-Perform...

引用

Custom Integrated Circuits Conference (CICC)

作者： Lin Zhang Berkehan Ciftcioglu Hui Wu Laboratory for Advanced Integrated Circuits and Systems Department of Electrical and Computer Engineering University of Rochester Rochester NY USA

Injection-locked clocking (ILC) has been proposed previously to improve the skew and jitter performance while reducing the power consumption in multi-gigahertz clock distribution networks. This paper presents a new design of the injection-locked oscillator (ILO) suitable for ILC applications. It uses a transformer to generate differential signals and then directly inject them into the ILO core. It also incorporates a switched-capacitor array for frequency tuning and hence digital deskew in ILC. A 4 GHz test chip was designed and fabricated in a 0.18 mum standard digital CMOS. It consists of four ILOs driven by a balanced H-tree. Each ILO consumes less than 1 mW from a 1 V power supply. 5-bit digital deskew achieves 55 ps delay tuning range and 1.8 ps resolution. Measurement shows that only 30 fs cycle-to-cycle jitter degradation was introduced and no phase noise degradation at frequency offset up to 600 kHz.

关键词： Injection-locked oscillators Clocks Jitter Frequency Tuning Degradation Energy consumption Signal generators Transformer cores Testing

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An Estimation of Distribution Improved Particle Swarm Optimization Algorithm

An Estimation of Distribution Improved Particle Swarm Optimi...

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Intelligent Sensors, Sensor Networks and Information Processing Conference (ISSNIP)

作者： R. V. Kulkarni G. K. Venayagamoorthy Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri MO USA

PSO is a powerful evolutionary algorithm used for finding global solution to a multidimensional problem. Particles in PSO tend to re-explore already visited bad solution regions of search space because they do not learn as a whole. This is avoided by restricting particles into promising regions through probabilistic modeling of the archive of best solutions. This paper presents hybrids of estimation of distribution algorithm and two PSO variants. These algorithms are tested on benchmark functions having high dimensionalities. Results indicate that the methods strengthen the global optimization abilities of PSO and therefore, serve as attractive choices to determine solutions to optimization problems in areas including sensor networks.

关键词： Particle swarm optimization Ant colony optimization Electronic design automation and methodology Probability distribution Benchmark testing Optimization methods Equations Genetic mutations Space exploration Real time systems

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SMF: A User-Friendly Software Engine for Space-Mapping-Based engineering Design Optimization

SMF: A User-Friendly Software Engine for Space-Mapping-Based...

引用

URSI International Symposium on Signals, systems, and Electronics (ISSSE)

作者： Slawomir Koziel John W. Bandler Simulation Optimization Systems Research Laboratory Department of Electrical and Computer Engineering McMaster University Hamilton ONT Canada

Although space mapping is a powerful optimization and modeling methodology, it is not always straightforward to implement, especially if one wants to use some advanced techniques and employ commercial simulators in the automatic optimization loop. The SMF system is a user-friendly space mapping software that is designed to make space mapping accessible to engineers inexperienced in this technology. SMF allows automatic or interactive space-mapping-based constrained optimization, modeling and statistical analysis. It incorporates most of the existing space mapping techniques including input, output, implicit, and frequency space mapping as well as the latest developments such as space-mapping based interpolation and advanced modeling techniques. SMF provides sockets to popular EM/circuit simulators including Sonnet em, MEFiSTo, ADS, and FEKO. In this paper we give a brief introduction to space mapping methodology as well as an exposition of the SMF system with special focus on its optimization interfaces. An SMF application example is given.

关键词： Engines Design engineering Design optimization Space technology Optimization methods Power engineering and energy Power system modeling Software design Constraint optimization Statistical analysis

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Controlling Convergence of Space-Mapping Algorithms for engineering Optimization

Controlling Convergence of Space-Mapping Algorithms for Engi...

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URSI International Symposium on Signals, systems, and Electronics (ISSSE)

作者： Slawomir Koziel John W. Bandler Simulation Optimization Systems Research Laboratory Department of Electrical and Computer Engineering McMaster University Hamilton ONT Canada

The problem of convergence properties of space mapping optimization algorithms is addressed. A new weighting scheme in the parameter extraction procedure is introduced that allows us to control the behavior of the space mapping algorithm and force it to converge after a reasonable number of fine model evaluations. An application example is provided.

关键词： Convergence Samarium Parameter extraction Optimization methods Electromagnetic modeling Design optimization Iterative algorithms Computational modeling computer simulation Laboratories

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Monopedal running control: SLIP embedding and virtual constraint controllers

Monopedal running control: SLIP embedding and virtual constr...

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2007 IEEE/RSJ International Conference on Intelligent Robots and systems

作者： Ioannis Poulakakis J. W. Grizzle Control Systems Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

Two feedback controllers that induce stable running gaits on a three-degree-of-freedom asymmetric hopper, termed the asymmetric spring loaded inverted pendulum (ASLIP), see Fig. 1, are compared in terms of their steady-state and transient behaviors. In each case, feedback is used to create a lower-dimensional hybrid subsystem that determines the existence and stability properties of periodic motions of the full-dimensional closed-loop system. The first controller creates a one degree-of-freedom subsystem through imposing two suitably selected (virtual) holonomic constraints on the configuration variables of the ASLIP. The second controller asymptotically imposes a single (virtual) holonomic constraint to create a two-degree-of-freedom subsystem that is diffeomorphic to a standard spring loaded inverted pendulum (SLIP). The two controllers induce identical steady-state behaviors. Under transient conditions, however, the underlying compliant nature of the SLIP allows significantly larger disturbances to be accommodated, with less actuator effort, and without violation of the unilateral constraints between the leg end and the ground.

关键词： Legged locomotion Springs Leg Control systems Steady-state Actuators Adaptive control Predictive models Torso Nonlinear dynamical systems

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FPGA Implementation of a Unidirectional Systolic Array Generator for Matrix-Vector Multiplication

FPGA Implementation of a Unidirectional Systolic Array Gener...

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IEEE International Conference on Signal Processing and Communications, ICSPC

作者： M.Ch. Karra M. P. Bekakos I. Z. Milovanovic E. I. Milovanovic Laboratory of Digital Systems Department of Electrical and Computer Engineering School of Engineering Democritus University of Thrace Xanthi Greece Nis Serbia

Systolic arrays may prove ideal structures for the representation and the mapping of many applications concerning various numerical and non-numerical scientific applications. Especially, some formulation of Dynamic Programming (DP) - a commonly used technique for solving a wide variety of discrete optimization problems, such as scheduling, string-editing, packaging, and inventory management can be solved in parallel on systolic arrays as matrix-vector products. Systolic arrays usually have a very high rate of I/O and are well suited for intensive parallel operations Herein is a description of the FPGA hardware implementation of a matrix-vector multiplication algorithm designed to produce a unidirectional systolic array representation.

关键词： Field programmable gate arrays Systolic arrays Signal processing algorithms Hardware Dynamic programming Matrix decomposition Concurrent computing Circuits Digital signal processing Application software

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Kinematic simulative analysis of virtual potential field method for AUV trajectory planning

Kinematic simulative analysis of virtual potential field met...

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Mediterranean Conference on Control and Automation (MED)

作者： M Barisic Z. Vukic N. Miskovic Department of Computer and Control Engineering Laboratory for Underwater Systems and TechnologiesFaculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

This paper deals with an analysis of applicability, capabilities, benefits and pitfalls of using a virtual potential field approach to autonomously planning trajectories in non-communicating autonomous underwater vehicles (AUV-s). Virtual potentials represent an approach to this problem with cross-layer design features. Examples of different layers of control that can be achieved with the same fundamental approach are: obstacle-avoidance, energy-optimal trajectories, forming up with other moving agents, controlled formation fragmentation into well-posed sub-formation etc. This paper shows, on the basis of extensive simulated experiments, that such a trajectory planner based on virtual potentials, guarantees good extendibility, scalability and performance in a hard-real-time hardware-in-the-loop system.

关键词： Kinematics Analytical models Trajectory Computational modeling computer simulation Electric variables measurement Feature extraction Stability Underwater vehicles Communication system control

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Transfer function identification by using self-oscillations

Transfer function identification by using self-oscillations

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Mediterranean Conference on Control and Automation (MED)

作者： N. Miskovic Z. Vukic M. Barisic University of Zagreb Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering Laboratory for Underwater Systems and Technologies Zagreb Croatia Faculty of Electrical Engineering and Computing University of Zagreb Laboratory for Underwater Systems and Technologies Zagreb Croatia

The work presented in this paper deals with the process of transfer function identification by using self-oscillation method (autotuning identification method). The algorithm is given in a general matrix form and some modifications are introduced. The modifications of the algorithm include augmentation of the initial algorithm for Type k systems, systems with delays and discrete-time systems. The paper also includes simulation examples which describe the introduced modifications. Apart from being rather simple, this method is applicable to real systems. Its greatest advantage is quick identification of a transfer function (depends on the system).

关键词： Transfer functions Relays Frequency Control systems Control engineering computing Delay systems Vehicle dynamics Open loop systems Delay effects Feedback

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An outline of an architecture-based method for optimizing dependability attributes of software-intensive systems

An outline of an architecture-based method for optimizing de...

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Workshop on Architecting Dependable systems, WADS 2006

作者： Grunske, Lars Lindsay, Peter Bondarev, Egor Papadopoulos, Yiannis Parker, David School of Information Technology and Electrical Engineering ARC Centre for Complex Systems University of Queensland Brisbane 4072 Australia Eindhoven University of Technology System Architectures and Networking Group 5600 MB Eindhoven Netherlands Department of Computer Science University of Hull Hull HU6 7RX United Kingdom

ISBN: (纸本)9783540740339

Dependability requirements such as safety and availability often conflict with one another making the development of dependable systems challenging. It is not always possible to design a system that fulfils all of its dependability requirements and consequently, it is necessary to identify conflicts early in the development process and to optimize the architectural design with regard to dependability and cost. This paper first provides an overview of fifteen different approaches to optimizing system designs at an architectural level. Then an abstract method is proposed that synthesises the main points of the different approaches to yield a generic approach that could be applied across a wide variety of different system attributes. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Software architecture

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Resource Allocation in Multiple Access Channels

Resource Allocation in Multiple Access Channels

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Asilomar Conference on Signals, systems & computers

作者： Ali ParandehGheibi Atilla Eryilmaz Asuman Ozdaglar Muriel Medard Laboratory for Information and Decision Systems Electrical Engineering and Computer Science Department Massachusetts Institute of Technology Cambridge MA USA Electrical and Computer Engineering Ohio State Uinversity OH USA

We consider the problem of rate allocation in a Gaussian multiple-access channel, with the goal of maximizing a utility function over transmission rates. In contrast to the literature which focuses on linear utility functions, we study general concave utility functions. We present a gradient projection algorithm for this problem. Since the constraint set of the problem is described by exponentially many constraints, methods that use exact projections are computationally intractable. Therefore, we develop a new method that uses approximate projections. We use the polymatroid structure of the capacity region to show that the approximate projection can be implemented by a recursive algorithm in time polynomial in the number of users. We further propose another algorithm for implementing the approximate projections using rate-splitting and show improved bounds on its convergence time.

关键词： Resource management Polynomials Multiaccess communication Throughput Fading Laboratories Quality of service Projection algorithms Convergence Bandwidth

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