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Circuits and Systems, 1992. ISCAS '92. Proceedings., 1992 IEEE International Symposium on

Date 10-13 May 1992

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  • Electrical power network decomposition for parallel computations

    Publication Year: 1992 , Page(s): 2761 - 2764 vol.6
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (364 KB)  

    Introduces an electrical power network decomposition methodology for the network equation solution by block-iterative methods implemented on parallel computers. The proposed methodology is based on the building up of a fixed number of subnetworks by aggregating network nodes to a given number of so-called seed nodes. The aggregation method is controlled by a node ranking criterion based on the wei... View full abstract»

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  • Network theoretic conditions for existence and uniqueness of steady state solutions to electric power circuits

    Publication Year: 1992 , Page(s): 2821 - 2828 vol.6
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (628 KB)  

    Surveys available network theoretic results on conditions under which the unique and operationally acceptable load flow solution exists. The main topic is the problem of establishing system-dependent bounds on input and network topology within which the unique solution exists. Both decoupled real-power-phase angle and reactive-power-voltage problems are studied. The particular emphasis is on the c... View full abstract»

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  • Shift invariant pattern recognition by associative memory

    Publication Year: 1992 , Page(s): 2913 - 2916 vol.6
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (412 KB)  

    Presents a network architecture that can perform shift invariant pattern recognition. The network is composed of a preprocessing block and an associative memory block which is a recurrent neural network. The preprocessing network is designed in such a way that the output of this block is almost invariant under shifted input patterns. The associative memory block is employed to recall the original ... View full abstract»

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  • Standard cell placement with Dynamic Clouds method

    Publication Year: 1992 , Page(s): 2985 - 2988 vol.6
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (268 KB)  

    A new procedure for the efficient placement of standard cells is proposed. A procedure based only on the Dynamic Clouds method (see E. Diday et al., 1979) was implemented in a program called Germinal. Germinal proceeds by stages. During the germination stage, germs are selected, and during the growth stage, germs are allowed to grow by clustering cells according to suitable criteria. Germinal uses... View full abstract»

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  • CMOS low-voltage operational amplifiers with constant-Gm rail-to-rail input stage

    Publication Year: 1992 , Page(s): 2876 - 2879 vol.6
    Cited by:  Papers (36)  |  Patents (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (320 KB)  

    Two 3-V CMOS low-voltage operational amplifiers (op-amps) with constant transconductance (gm) rail-to-rail input stages are presented. The constant gm ensures a constant unity-gain frequency within the whole common-mode input range. Two new methods to control the gm of the input stage are introduced. The op-amps contain the same class-AB ... View full abstract»

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  • Dynamic behaviors in two novel autonomous circuits with a physical negative resistor characterized by nonsymmetric function

    Publication Year: 1992 , Page(s): 2813 - 2816 vol.6
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (264 KB)  

    Presents two novel three-order autonomous circuits. The nonlinear element in the circuits may be any physical negative resistor, either piecewise-linear or irregular. Using a type-S negative resistance element, the authors observed the double scroll attractors similar to that in Chua's circuit. Using an avalanche transistor, they observed more complicated dynamic behaviors than in other autonomous... View full abstract»

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  • QR-decomposition based algorithms for adaptive Volterra filtering

    Publication Year: 1992 , Page(s): 2625 - 2628 vol.6
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (272 KB)  

    The authors present an approach to the development of fast and numerically stable recursive least squares (RLS) algorithms for adaptive nonlinear filtering using QR-decomposition of the data matrix. They introduce a pair of QR-RLS adaptive algorithms for second-order Volterra filtering. Both the algorithms are based solely on Given's rotation. Hence both are numerically stable and highly amenable ... View full abstract»

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  • A theoretical analysis of the classic hydro-thermal optimization algorithm in power system scheduling

    Publication Year: 1992 , Page(s): 2757 - 2760 vol.6
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (212 KB)  

    Analyzes the classic hydrothermal optimization algorithm in power system scheduling. The algorithm is derived from a Lagrangian duality formulation of the scheduling problem. Its convergence properties are studied, and under simplifying assumptions conditions for convergence are established. Convergence can be guaranteed for the relaxed classical algorithm. The convergence conditions as well as th... View full abstract»

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  • Optimal weighted order statistic filters under structural constraints

    Publication Year: 1992 , Page(s): 2621 - 2624 vol.6
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (272 KB)  

    The authors present a procedure based on quadratic programming for finding the optimal weighted order statistic filter under the mean absolute error criterion satisfying imposed structural constraints. In this way, filters are obtained that simultaneously meet the desired detail preservation constraints and give a good noise attenuation. The algorithm is characterized by low computational complexi... View full abstract»

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  • A new approach to the associative memory design using neural networks

    Publication Year: 1992 , Page(s): 2925 - 2928 vol.3
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (232 KB)  

    Proposes a design for associative memory using a neural network. The problem of associative memory is transformed to a constrained optimization problem. The information storage and retrieval algorithms and the network architecture for the proposed associative memory are described. Simulations were carried out to test the proposed storage/retrieval algorithms. The results of these simulations are p... View full abstract»

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  • Neural networks for optimization of nonquadratic cost functions with application to adaptive signal processing

    Publication Year: 1992 , Page(s): 2909 - 2912 vol.6
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (292 KB)  

    A new neural adaptive filtering structure was proposed by the authors (1990-1991), based on a least-squares (LS) performance function of errors. This structure is generalized and a neural adaptive finite impulse response (FIR) filter is designed whose performance function is expressed in the general non-LS form. The proposed neural filter is shown to compute in real time the optimal set of the pro... View full abstract»

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  • The real homotopy-based method for computing solutions of electric power systems

    Publication Year: 1992 , Page(s): 2737 - 2740 vol.6
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (280 KB)  

    Presents a real homotopy-based method to calculate the roots of any system of polynomial equations in n real variables. This method eliminates some of the computational effort required in the existing homotopy- and imbedding-based continuation methods. The method allows for the computation of real solutions of even large-sized deficient polynomial systems. As an example, the method is app... View full abstract»

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  • A new approach to global optimization using ideas from nonlinear stability theory

    Publication Year: 1992 , Page(s): 2817 - 2820 vol.6
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (364 KB)  

    Describes a method for determining the global optimum of a function on a compact manifold. The method determines and connects all the local minima and local maxima of a function on a compact manifold. The method is based on properties of stability regions associated with the equilibria of the gradient vector field. Applications of the method include global optimization and nonlinear equation solvi... View full abstract»

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  • Monolithic CMOS compandors based on Σ-Δ oversampling

    Publication Year: 1992 , Page(s): 2649 - 2652 vol.6
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (300 KB)  

    The CMOS compandor circuit presented is based on sigma-delta (Σ-Δ) oversampling. The Σ-Δ modulator converts an analog signal into a binary sequence, so that it can multiply another signal by on-and-off switching. Continuous-time CMOS multipliers, which are difficult to implement with high linearity, are not required in such a compandor configuration. Simulation results of a... View full abstract»

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  • Canards and chaos in nonlinear systems

    Publication Year: 1992 , Page(s): 2789 - 2792 vol.6
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (180 KB)  

    Canards are a new phenomenon in slow-fast systems. The canard phenomenon in three types of nonlinear systems is studied. The authors first study the behavior of the Hopf bifurcation for the following two-dimensional systems: (a) a slow-fast system with a cubic nonlinearity, (b) a system with a constrained curve, and (c) a slow-fast system with a piecewise linear nonlinearity. It is shown that syst... View full abstract»

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  • A high slew-rate voltage-mode op-amp

    Publication Year: 1992 , Page(s): 2872 - 2875 vol.6
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (248 KB)  

    The authors present a new architecture of a voltage-mode operational amplifier (VOA) which has been designed to provide high common-mode rejection ratio (CMRR) performance. The new amplifier attempts to retain the high slew-rate advantages of the current-feedback operational amplifier but within a balanced high input impedance structure, enabling it to be used as a conventional VOA. The amplifier ... View full abstract»

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  • A sigma-delta based PLL for non-sinusoidal waveforms

    Publication Year: 1992 , Page(s): 2661 - 2664 vol.6
    Cited by:  Papers (1)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (272 KB)  

    The authors describe a phase-locked loop architecture for the locking of nonsinusoidal waveforms. It is based on the generation of the locking signal by means of a proper waveform synthesizer. The free-running frequency of the synthesizer is dynamically adjusted to ensure a suitable lock range. The system has been functionally analyzed and simulated, and its feasibility has been demonstrated. The ... View full abstract»

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  • Blind adaptive filtering of unknown speech from unknown noise in a single receiver situation

    Publication Year: 1992 , Page(s): 2617 - 2620 vol.6
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (292 KB)  

    Describes a blind adaptive filtering approach to filtering speech from noise when no access is available to speech or to noise alone and no parameter or spectral information is available on either. The approach is concerned with a single source. The solution to this problem involves a priori assumptions on features such as relative degree or stationarity or model order rather than on a parameter o... View full abstract»

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  • High performance BiCMOS for digital/analog applications

    Publication Year: 1992 , Page(s): 3025 - 3028 vol.6
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (332 KB)  

    The authors examine the considerations for choosing among the various types of BiCMOS technology. They examine several BiCMOS approaches with increasing levels of sophistication. The many approaches to BiCMOS process integration are described. No fundamental incompatibility in process or device structure stands in the way of bipolar-CMOS integration. Significant performance enhancement over pure C... View full abstract»

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  • An environment for the development of microcode for pipelined architectures

    Publication Year: 1992 , Page(s): 2677 - 2680 vol.6
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (356 KB)  

    An environment for the development of microcode for parallel and pipelined machines is presented. The system is based on a set of low-level transformations called pipelined percolation scheduling (PPS). The PPS transformations are integrated into a system which does automatic code compaction, but also allows interactive control of the parallelization process, while the system deals with the burden... View full abstract»

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  • An efficient cubic spline approach to lifetime estimation [VSLI]

    Publication Year: 1992 , Page(s): 2989 - 2992 vol.6
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (332 KB)  

    The problem of VLSI circuit lifetime estimation is discussed. It is shown that lifetime determination is equivalent to finding the smallest zero of a continuous nondifferentiable function for a specific circuit realization. An iterative multiple cubic spline approximation algorithm is proposed to determine the lifetime. The application to VLSI circuit analysis is described, in which the degradatio... View full abstract»

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  • The interaction of system structure, index, and numerical stability in classes of differential/algebraic systems

    Publication Year: 1992 , Page(s): 2840 - 2843 vol.6
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (300 KB)  

    Examples of differential/algebraic equation (DAE) systems are presented which arise in power systems and nonlinear circuit analysis, and the analytical and numerical challenges that these systems pose are considered. The author discusses the change in the system index due to the inclusion of a parameter limiter, and a numerical instability which may arise when systems of DAEs are simulated at poin... View full abstract»

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  • An analog neural network for linear programming: analysis, design and simulation

    Publication Year: 1992 , Page(s): 2905 - 2908 vol.6
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (272 KB)  

    Presents an analog recurrent neural network for solving linear programs. The proposed analog neural network is asymptotically stable and able to generate optimal solutions to linear programming problems. The asymptotic properties of the proposed analog neural network for linear programming are analyzed theoretically. The circuit design for realizing the analog network is discussed. Two illustrativ... View full abstract»

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  • Feature oriented image sequence processing and 3D adaptive morphology-formulation and properties

    Publication Year: 1992 , Page(s): 2633 - 2636 vol.6
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (412 KB)  

    The authors propose a type of feature oriented image sequence processing based on the 3D geometrical structures of image sequences, 3D adaptive morphological operators are developed for the purpose. The operators can adapt the shapes of their operational windows according to the 3D local geometrical structures of image sequences. Thus, not only can the spatial correlation in each frame be utilized... View full abstract»

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  • Chaotic behaviour of distributed nonlinear circuits

    Publication Year: 1992 , Page(s): 2809 - 2812 vol.6
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (296 KB)  

    A detailed procedure for analyzing the chaotic behavior of a second-order negative resistance distributed oscillator is presented. Both cases of commensurate transmission lines and noncommensurate transmission lines are considered. The negative resistance characteristics as well as the relative length of the transmission lines play an important role in the qualitative behavior of the circuit. The ... View full abstract»

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