IEEE Transactions on Circuits and Systems

Volume 37 Issue 4 • Apr 1990

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Displaying Results 1 - 19 of 19
  • Multivariable canonical forms for model reduction of 2-D discrete time systems

    Publication Year: 1990, Page(s):488 - 501
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (756 KB)

    Two canonical forms that are suitable for use in the Badreddin-Mansour reduction scheme for multi-input-multi-output (MIMO) 2-D discrete-time system are introduced. It is shown that stability of the reduced model is guaranteed for separable and/or 1-horizontal-1-vertical (1 h-1 v) systems. An example is provided to illustrate the development of the MIMO canonical forms View full abstract»

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  • Rigorous analyses of windows in a symmetric circuit

    Publication Year: 1990, Page(s):473 - 487
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (844 KB)

    Two types of windows are found in a symmetric circuit that cannot be seen in the logistic map and are inherent in the symmetric structure of this circuit. One type of window exhibits complex bifurcation phenomena such as symmetry breaking and symmetry recovering in its own region, while the other type of window appears when one chaotic attractor bifurcates to two periodic attractors. The authors d... View full abstract»

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  • Synthesis of arbitrary rational transfer functions in s using uniform distributed RC active circuits

    Publication Year: 1990, Page(s):464 - 472
    Cited by:  Papers (6)  |  Patents (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    A synthesis technique is described whereby network functions that are rational in s are realized with uniform distributed RC elements and active elements. In contrast to previous distributed synthesis approaches, the technique works directly in the s plane without complex mathematical transformations, uses only grounded rectangular single-layer uniform distributed R... View full abstract»

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  • An exact analysis of class E amplifiers with finite DC-feed inductance at any output Q

    Publication Year: 1990, Page(s):530 - 534
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Previous analyses of class E amplifiers have required infinite output network Q and/or infinite DC-feed inductance. A Laplace-transform technique is applied to class E circuits with neither of these restrictions. The analysis presented is shown to have excellent agreement with observed circuit performance View full abstract»

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  • Limit cycles in zero input digital filters due to two's complement quantization

    Publication Year: 1990, Page(s):578 - 571
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    Limit cycles in zero-input N-order digital filters due to two's-complement truncation quantizers are investigated. A necessary condition and a sufficient condition for the existence of such limit cycles are presented. For the case of period one and period two, a necessary and sufficient condition is established. Some illustrative examples are given View full abstract»

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  • Signal flow analysis of feedback networks

    Publication Year: 1990, Page(s):455 - 463
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    Signal flow theory offers a computationally efficient and accurate design-oriented alternative to traditional feedback network analysis techniques. The latter often suffer from burdensome algebra and questionable approximations that render the impact of a given feedback loop on achievable network performance obscure. Unlike the classical literature, which formulates signal flow theory in terms of ... View full abstract»

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  • On via minimization

    Publication Year: 1990, Page(s):527 - 530
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Minimizing the number of vias in a two-layer circuit is known to reduce to a max cut problem in a planar graph. A similar reduction is presented that makes clear the planarity of the resulting graph. It is shown how to solve this problem in O(n/3/2logn ) time, where n is the number of nodes of the graph. The first polynomial bound obtained for this problem was... View full abstract»

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  • On asymptotic stability of nonlinear networks

    Publication Year: 1990, Page(s):571 - 573
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    Sufficient conditions are derived for global asymptotic stability for a class of nonlinear RLC networks with monotone elements that are driven by time-dependent sources. Some results obtained by other authors in formulating conditions for uniqueness of the steady state are extended View full abstract»

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  • The infeasibility of self-regulating constant-current-fed class E power inverters

    Publication Year: 1990, Page(s):558 - 561
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    Because of their high operating efficiency, class E circuits have been shown to be useful in high-frequency power inverters and converters. Typical circuits are constant-fed, i.e. they require an RF choke in the DC-feed line, and must obtain load regulation by means of appropriate feedback control. A class E inverter with finite DC-feed inductance that provides perfect load regulation without feed... View full abstract»

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  • Dynamics of adaptive systems

    Publication Year: 1990, Page(s):547 - 550
    Cited by:  Papers (161)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    A simple adaptive control mechanism is introduced into nonlinear systems that are capable of complicated oscillatory states and chaotic dynamics. It is shown that it provides efficient regulation while displaying novel behavior. Sudden perturbations in the system's parameters can degenerate into chaotic bursts with no precursors. When such bursts occur, the system first reverberates wildly and the... View full abstract»

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  • On the synthesis of a class of 2-D acausal lossless digital filters

    Publication Year: 1990, Page(s):502 - 518
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1516 KB)

    Passive and lossless two-dimensional (2-D) discrete systems of the fully recursive half-plane type are reviewed as one-dimensional (1-D) filters over convolutional algebra. Necessary and sufficient conditions for 2-D transfer functions to be valid scattering as well as immittance description of such systems are obtained. An algorithm for the structurally passive (in fact, lossless) synthesis of fi... View full abstract»

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  • Bifurcation diagrams and fractal brain boundaries of phase-locked loop circuits

    Publication Year: 1990, Page(s):534 - 540
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    Several 2-parameter bifurcation diagrams and the boundaries of the basin attraction of various periodic orbits associated with a typical phase-locked loop circuit widely used in modern communication systems are presented. Using these diagrams, the authors have identified and confirmed various routes to chaos reported previously for this circuit. Moreover, they have discovered that over certain reg... View full abstract»

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  • The complex basis in electrical networks and its application to network-element-value calculation

    Publication Year: 1990, Page(s):561 - 566
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    A fundamental and novel concept is introduced regarding the independence of variables (such as branch voltages and currents) in an electrical network sinusoidally excited by multiple frequencies. The new concept is characterized by a set of variables called the complex basis. A complex basis of a set X of variables excluding exciting voltages and current is defined to be a minimal subset ... View full abstract»

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  • 2-D filter stability tests using polynomial array

    Publication Year: 1990, Page(s):550 - 554
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    A stability table in which F(x,z)=Σaj(x )zj, for j=0 to n, where aj(x) are real polynomials of order n 1, called a polynomial array, is presented, and a systematic procedure for constructing its entries is given. The polynomial array is then used to t... View full abstract»

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  • Tellegen's theorem and power systems-new load flow equations, new solution methods

    Publication Year: 1990, Page(s):519 - 526
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    The exact steady-state response of a power system to perturbations has always been evaluated by solving the corresponding load-flow equations. New equations are proposed for evaluating the exact response of the power system to arbitrary perturbations. These equations are not derived from the system and nodal equations, as the conventional load-flow equations are; rather, they are derived from a we... View full abstract»

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  • Sliding mode controlled relaxation oscillations

    Publication Year: 1990, Page(s):540 - 543
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The possibility of inducing controlled relaxation oscillations in second-order systems is explored from the viewpoint of sliding-mode control. Applications to the design of triangular-wave and square-wave oscillators are discussed View full abstract»

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  • Extension of Lagrange interpolation to 2-D nonuniform samples in polar coordinates

    Publication Year: 1990, Page(s):567 - 568
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (120 KB)

    The reconstruction of a bandlimited 2-D signal from a set of nonuniform samples is discussed. The Lagrange interpolation is extended to 2-D signals using polar coordinates View full abstract»

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  • Optimal linear phase digital filter design by one-phase linear programming

    Publication Year: 1990, Page(s):554 - 558
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    An improved linear programming algorithm for the design of optimal linear-phase FIR filters with extra time-domain or frequency-domain constraints is presented. After stating the problem as involving the minimization of a linear function of filter parameters with linear constraints, a method is given for choosing an initial basic feasible solution of the dual problem that does not require the intr... View full abstract»

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  • An improved Wien bridge oscillator

    Publication Year: 1990, Page(s):543 - 546
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    A type of RC-active Wien-bridge oscillator is proposed whose oscillation frequency is independent of the time constants of the op amps used in the design and is determined only by passive components. Other important effects such as the influence of parasitic poles and nonlinearities in the stability of the system are also analyzed. Experimental results are given, showing close agreement w... View full abstract»

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