International Symposium on Signals, Circuits and Systems, 2005. ISSCS 2005.

14-15 July 2005

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  • An improved high performance CMOS second generation current conveyor

    Publication Year: 2005, Page(s):693 - 696 Vol. 2
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (201 KB) | HTML iconHTML

    This paper deals with optimally sizing CMOS current conveyors. Both static and dynamic performances are improved. Current conveyor performances are improved thanks to an objective function which minimizes Rx input resistance, noise effects and occupied area. Also, it maximizes Ry, Rz output resistances and both voltage and current bandwidths. The ameliorated optimized structure presents very good ... View full abstract»

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  • Lossless inductor using current feedback amplifier

    Publication Year: 2005, Page(s):689 - 692 Vol. 2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (182 KB) | HTML iconHTML

    A lossless grounded inductor simulation scheme using the current feedback amplifier (CFA) device is proposed. The circuit configuration is a minimal $RC realisation that exhibits extremely low active sensitivity. The effects of the port tracking errors (εt,v,t) on the circuit parameters have been examined, and, subsequently compensation design equations have been derived. Tuning of... View full abstract»

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  • A new method for denoising SONAR images

    Publication Year: 2005, Page(s):469 - 472 Vol. 2
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (281 KB) | HTML iconHTML

    The SONAR images are perturbed by a multiplicative noise called speckle, due to the coherent nature of the scattering phenomenon. The use of speckle reduction filters is necessary to optimize the images exploitation procedures. This paper presents a new speckle reduction method in the wavelets domain using a novel Bayesian-based algorithm, which tends to reduce the speckle, preserving the structur... View full abstract»

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  • Low noise CMOS mixers

    Publication Year: 2005, Page(s):685 - 688 Vol. 2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (181 KB) | HTML iconHTML

    This paper presents two new mixer circuits, designed by implementing the noise cancellation technique (NCT) (Bruccoleri et al., 2001) for a CMOS transistor (MOST) on single balanced mixer architecture. The single side band (SSB) noise figure performance of the proposed down conversion mixer architectures can be as low as 3.6dB@280MHz IF, if coils are used. The conversion gain of such NCT mixer is ... View full abstract»

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  • A model for computational collapse of chaotic 1D maps

    Publication Year: 2005, Page(s):741 - 744 Vol. 2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (189 KB) | HTML iconHTML

    The finite precision of machine arithmetic alters deeply the properties of chaotic 1D maps of the unit interval. The main contribution of this paper is a new set of descriptors of the properties of quantized 1D maps, and a full quantitative explanation of the properties of a particular family of quantized maps. View full abstract»

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  • Considerations on the speed controllers for vector controlled induction motor drives

    Publication Year: 2005, Page(s):465 - 468 Vol. 2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (182 KB) | HTML iconHTML

    The goal of this work is to study the performances of proportional-integral and fuzzy controllers for induction motor drives under vector control. This study is made using computer simulation. A systematic mathematical formulation is presented for designing motor controllers. A comparison between proportional integral speed controller and fuzzy speed controller performance is made if rotor time co... View full abstract»

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  • Current-mode sinusoidal wave multipliers

    Publication Year: 2005, Page(s):421 - 424 Vol. 2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB) | HTML iconHTML

    This paper presents two current-mode circuits which provide frequency multiplication for sinusoidal input signals. The circuits are based on translinear topologies that ensure high performances concerning frequency range, linearity and temperature stability. No selective circuits or signal conditioners are required. View full abstract»

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  • Relaxation oscillator output voltage linearity

    Publication Year: 2005, Page(s):681 - 684 Vol. 2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB) | HTML iconHTML

    This paper analyses the output voltage nonlinearity of current switching relaxation oscillator. An analytical model - taking into account the current sources finite output resistance - is developed, in order: (1) to get more precise design equation for transistor length; and (2) to evaluate the oscillation amplitude influence on the oscillation frequency. The results obtained for an oscillator rea... View full abstract»

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  • Transform domain equalizer for 2 dimensional read channel

    Publication Year: 2005, Page(s):613 - 616 Vol. 2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB) | HTML iconHTML

    A key component of a 2 dimensional read channel architecture is the 2D equalizer. For 2D PRML channels, the complexity of the equalizer needed is high and presents a challenge for practical implementation. A transform domain 2D equalizer for use in multitrack 2D storage systems is presented. The architecture offers a significant reduction in complexity for short length transforms, when compared to... View full abstract»

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  • Multiwavelet neural networks construction study

    Publication Year: 2005, Page(s):789 - 792 Vol. 2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB) | HTML iconHTML

    Multiwavelet neural networks are a new class of artificial neural networks and their activation functions are multiwavelet functions or multi-scale functions. The activation functions in different neural networks including feedforward, radial basis functions, wavelets and multiwavelets are discussed and compared. The relations between multiwavelet transformations and artificial neural network are ... View full abstract»

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  • Compact cross-coupled filters for UMTS applications

    Publication Year: 2005, Page(s):725 - 728 Vol. 2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (175 KB) | HTML iconHTML

    Very compact planar resonators were developed for the 1950 MHz frequency band. Resonators are of the stepped-impedance (SIR) type and they are folded, in order to occupy a very small surface area. On a 0.635 mm height commercial substrate with a 10.8 dielectric constant, a resonator can be fitted into a square with an edge size of 5.8 mm. Small-size filters were designed by cross-coupling the comp... View full abstract»

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  • Analyses of a bidirectional DC-DC half-bridge converter with zero voltage switching

    Publication Year: 2005, Page(s):449 - 452 Vol. 2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (153 KB) | HTML iconHTML

    A survey of important data (maximum voltage and current ratings for the elements, rms values for the semiconductor devices and a rough approximation of the losses) of a half-bridge bidirectional DC/DC converter is given. A realistic converter model is derived. The transfer function for output voltage depending on the duty cycle and the transfer function for coupling of two voltage sources are calc... View full abstract»

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  • Chaos analysis in a computer simulation of the piriform cortex

    Publication Year: 2005, Page(s):757 - 760 Vol. 2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (257 KB) | HTML iconHTML

    In this paper, we study the level of chaos (using the largest Lyapunov exponent measure) and the geometry of the attractors (using fractal dimension) for a biologically realistic neural network model of the piriform cortex. The analyzed signals which describe the model are the EEGs, recorded during simulations obtained with the GENESIS system (general neural simulation system). We show experimenta... View full abstract»

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  • Motion planning for two mobile robots in an environment with obstacles by using cellular neural networks

    Publication Year: 2005, Page(s):801 - 804 Vol. 2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (255 KB) | HTML iconHTML

    The paper presents a visual control algorithm based on images, for two mobile robots in an environment with obstacles. Cellular neural networks (CNNs) processing techniques are used here for motion planning in real time of two mobile robots moving to the same target. The algorithm can be extended for three or more robots. View full abstract»

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  • A study of effective permittivity for thermotropic liquid crystals in 7.8-12.4 GHz frequency range

    Publication Year: 2005, Page(s):737 - 740 Vol. 2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (222 KB) | HTML iconHTML

    A liquid crystal study was performed, in order to determine the relative effective electric permittivity, using a microwave simulation method. Three thermotropic types of liquid crystals: nematic, smectic and cholesteric were considered and their structures were simulated with the help of a microwave simulation program: high frequency structure simulator (HFSS - Ansoft Technologies). An analysis m... View full abstract»

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  • A control scheme for three level inverter

    Publication Year: 2005, Page(s):461 - 464 Vol. 2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (214 KB) | HTML iconHTML

    In this paper a control strategy for a three-level neutral point clamped inverter (NPC) is described on the assumption that the inverter feed an induction motor drive with vector control. In the NPC inverter, the three level pulse width modulation (PWM) techniques based on the sine triangle FWM and space vector modulation are used to drive the induction motor. A model of induction machine is devel... View full abstract»

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  • An evaluation of memory effect to performance on a real reconfigurable computing system

    Publication Year: 2005, Page(s):769 - 772 Vol. 2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (255 KB) | HTML iconHTML

    Advance of VLSI technology allows programmable devices to implement the high-speed and large circuits, as well as ASIC. This fact drives forward concept of reconfigurable computing (RC). RC can establish an efficient computing system that has the characteristics of the software flexibility and the high-speed hardware. Although many RC systems have developed, evaluations including the behaviors of ... View full abstract»

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  • Analysis and performance of a versatile CMOS neural circuit based on multi-nested approach

    Publication Year: 2005, Page(s):417 - 420 Vol. 2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (215 KB) | HTML iconHTML

    Hardware implementations of the multi-nested universal cellular neural networks (CNN) cell can provide a method of evaluating arbitrary Boolean functions with great performance. This paper examines, through layout and SPICE simulations, a novel neural circuit with two nests implemented in Austria Microsystems (AMS) 0.35 μm CMOS technology. Our circuit is designed as reconfigurable cell and work... View full abstract»

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  • A linear CMOS voltage-to-current converter

    Publication Year: 2005, Page(s):677 - 680 Vol. 2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB) | HTML iconHTML

    An improved CMOS voltage-to-current converter is presented. PMOS transistors are employed in the resistor-replacement and voltage-level shifting of the proposed converter to avoid the body effect. To accurately annihilate the nonlinear voltage terms, a better modeling of the drain-to-source current of the MOS transistor operating in the linear region is essential and is adopted. Specifically the s... View full abstract»

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  • NAT/Firewall traversal for SIP: issues and solutions

    Publication Year: 2005, Page(s):521 - 524 Vol. 2
    Cited by:  Papers (2)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB) | HTML iconHTML

    Traversal of the session initiation protocol (SIP) and the sessions it establishes through network address translators (NATs) is a challenge for IP communications. The status of near-ubiquitous deployment of NAT across the Internet and the great diversity of their behavior raise a serious obstacle in the SIP's deployment. This paper analyzes different SIP deployment scenarios and traversal mechani... View full abstract»

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  • Scalable FIR filtering on transport triggered architecture processor

    Publication Year: 2005, Page(s):493 - 496 Vol. 2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (222 KB) | HTML iconHTML

    FIR filtering is an inevitable DSP operation in a wide variety of applications. In this paper, a processor based FIR filter, which is scalable in terms of multiply and accumulate units, is presented. The transport triggered architecture processor is accompanied with resources, which accelerate the FIR filtering. Depending on the number of resources, parallel code is configured to achieve high util... View full abstract»

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  • Local contrast enhancement in digital mammography by using mathematical morphology

    Publication Year: 2005, Page(s):609 - 612 Vol. 2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (283 KB) | HTML iconHTML

    An algorithm for both local contrast enhancement and background texture suppression in digital mammographic images is proposed. The algorithm is based on mathematical morphology applied to gray-scale image processing. Several examples demonstrate the efficiency of the new algorithm in enhancing the details, object extraction and detection of microcalcifications in digital mammograms. View full abstract»

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  • Adaptive interference cancellation: a unitary approach

    Publication Year: 2005, Page(s):569 - 572 Vol. 2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (165 KB) | HTML iconHTML

    This paper deals with a general formulation of the adaptive interference cancellation and also points out the issues arising in the adaptive process for some of the classic adaptive algorithms. Based on a general expression for the cost function of an adaptive filter, we derive the orthogonalization equation and we place it into the adaptive interference cancellation context. The paper derives nec... View full abstract»

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  • Global optimization in complex circuits design

    Publication Year: 2005, Page(s):785 - 788 Vol. 2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (251 KB) | HTML iconHTML

    Today's circuit design process is become a complex task. Sequential logic synthesis is an important part of the circuit design flow. The logic synthesis phase is a bottleneck during the overall design process since heuristic techniques which take a considerable amount of time are often used during this phase. A good solution is realized in a constrained design space by using global optimization te... View full abstract»

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  • Application of methodology of invariant approximations to magnetic circuit analysis

    Publication Year: 2005, Page(s):585 - 588 Vol. 2
    Cited by:  Papers (1)
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    Development of methodology of invariant approximations according to analysis of a magnetic circuit is being presented. Proposed model preserves tensor characteristics of initial Maxwell's equations. View full abstract»

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