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IEEE Transactions on Circuits and Systems

Issue 5 • May 1985

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Displaying Results 1 - 20 of 20
  • Canonical piecewise-linear analysis- II: Tracing driving-point and transfer characteristics

    Publication Year: 1985, Page(s):417 - 444
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2828 KB)

    An extremely efficient breakpoint-hopping algorithm is presented for tracing the driving-point and transfer characteristics of any nonlinear circuit made of linear (possibly multi-terminal) resistors, dc independent sources, linear controlled sources (all 4 types) and 2-terminal nonlinear resistors described by piecewise-linearupsilon - icharacteristics. Most resistive nonlinear electro... View full abstract»

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  • III-posed sampling theorems

    Publication Year: 1985, Page(s):481 - 484
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (439 KB)

    There are a number of innocent appearing sampling theorems that are ill-posed, i.e., a small amount of noise superimposed on the data can render the interpolation unstable. Using Papoulis' Generalized Sampling Theorem, we show that a sufficient condition for a sampling theorem to be ill-posed is that an interpolation function has infinite energy. Specific examples include the case where (a) the si... View full abstract»

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  • Stability assessment of two-dimensional state-space systems

    Publication Year: 1985, Page(s):484 - 487
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (463 KB)

    The two-dimensional Fornasini-Marchesini model [1], [2] is one of the most general state-spice models available. Although conditions for stability for this model are theoretically simple, actual numerical verification is not a trivial exercise. One way to overcome this problem is to compute the matrix normmaxparallel A_{1} + e^{jw}A_{2} parallel_{1}for realw, and the system i... View full abstract»

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  • On the cross-Gramian for symmetric MIMO systems

    Publication Year: 1985, Page(s):487 - 489
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (342 KB)

    Recently, Laub et al. [1] and Fernando and Nicholson [2] extended the definition of the cross-Gramian matrixW_{co}to include symmetric MIMO systems where the matrixW_{co}is defined as an integral. In this correspondence, we define this matrix as a solution of a Lyapunov equation and prove the fundamental identityW_{co}^{2} = W_{c}W_{o}whereW_{c}andW... View full abstract»

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  • Periodicity and Chaos in Chua's Circuit

    Publication Year: 1985, Page(s):501 - 503
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (325 KB)

    This paper reports a period-doubling route to chaos as observed from a laboratory model of the simplest possible chaotic autonomous circuit: it is made of two linear capacitors, one linear inductor, one linear resistor, and only one nonlinear 2-terminal resistor characterized by a 5-segment piecewise-linearupsilon - icharacteristic. View full abstract»

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  • A note on global implicit function theorems

    Publication Year: 1985, Page(s):503 - 505
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (346 KB)

    Applying the theory of covering maps, we will give an extension of global implicit function theorems proved by Sandberg [1]. Although he mentioned the theory of covering maps, he did not appeal to it. In fact, under his assumptions we can prove that the projection map toy-coordinates becomes a covering map. Then, by the theory of covering maps, we can obtain more general results. In the... View full abstract»

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  • Signal delay in RC mesh networks

    Publication Year: 1985, Page(s):507 - 510
    Cited by:  Papers (70)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (458 KB)

    Simple closed-form bounds for signal propagation delay in linearRCtree models for MOS interconnect were derived in [1]. This paper shows that these bounds are also valid for the more general class of linear networks known asRCmeshes, which are useful as models for portions of MOS logic circuits that cannot be represented asRCtrees. View full abstract»

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  • Correction to 'Predictive Coding for FIR Filter Wordlength Reduction'

    Publication Year: 1985, Page(s): 512
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (35 KB)

    First Page of the Article
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  • On convergence to steady state

    Publication Year: 1985, Page(s):489 - 491
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    Considered here is a nonlinear system of ordinary differential equations with a time-dependent force vector that converges to a constant. Conditions are given for the system to approach a steady state. The rate of convergence is also considered. View full abstract»

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  • Elimination of parasitic capacitances in switched-capacitor circuits by circuit transformations

    Publication Year: 1985, Page(s):467 - 475
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    A general method is presented which allows one to eliminate all parasitic capacitances to ground in a switched-capacitor circuit. The circuit transformation is generated by transformations on the nodal admittance matrix which leaves the transfer function invariant. In almost all cases the minimal number of operational amplifiers required for stray capacitance insensitive circuits is obtained. A fe... View full abstract»

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  • Practical aspects of digital sinewave generation using a second-order difference equation

    Publication Year: 1985, Page(s):510 - 511
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    Generation of a sequence of sinusoidal values using a second-order difference equation is examined. Excessive roundoff error accumulation is prevented by an error reset mechanism derived by Mitra, et al., which requires calculation of two integers whose ratio is the desired normalized sine frequency within a specified tolerance. Simple closed-form expressions suitable for microcomputer implementat... View full abstract»

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  • Threshold decomposition of multidimensional ranked order operations

    Publication Year: 1985, Page(s):445 - 450
    Cited by:  Papers (80)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    A useful class of robust nonlinear digital filters is the group of sliding window filters which use ranked order operations at each position of the window to produce the filter output. Median filters, alpha trimmed filters, and weighted rank filters are all included in this class. In this paper, it is shown that for all these filters, filtering an arbitrary level signal is equivalent to decomposin... View full abstract»

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  • Sensitivity formulas for terminated lossless two-ports

    Publication Year: 1985, Page(s):459 - 466
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (960 KB)

    Simple, yet very general, formulas are given for the partial derivatives of the loss and phase of both singly and doubly terminated, reciprocal, lossless 2-ports with respect to any internal immittance. This immittance may be of either a wanted or a parasitic component. The formulas have a simple physical interpretation, and are generalizations of earlier results. Their use is illustrated through ... View full abstract»

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  • A non-exact-multiplication scheme for digital filter implementation using bit-slice components

    Publication Year: 1985, Page(s):499 - 501
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    In the implementation of digital filters using bit-slice components, a significant amount of hardware can be saved with insignificant loss of performance if the multiplications involving the least significant bits of the signal and coefficient values are ignored. The effect is the introduction of an error noise source in the multiplier. Optimum hardware count for a given total output noise power i... View full abstract»

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  • An implicit solution for IIR filters with equiripple group delay

    Publication Year: 1985, Page(s):476 - 478
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    This paper presents a method for solving implicitly the poles of recursive digital filters having an equiripple group delay in the given passband. The method applies to low-pass, high-pass, and bandpass filters. The design is based on a transformation mapping the group delay function into another one so that the approximation interval is stretched onto the upper unit semicircle. The equiripple con... View full abstract»

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  • The elimination of spikes in the magnitude frequency response of 2-D discrete filters by increasing the stability margin

    Publication Year: 1985, Page(s):451 - 458
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB)

    In the numerical design of two-dimensional (2-D) discrete filters, it is known that spurious spikes can and often do appear in the final optimized 2-D magnitude frequency response. Although such spikes usually have extraordinary narrow bandwidths, they can have large magnitudes and often lead to unsatisfactory spatial response. Two methods are presented to remove these spikes by increasing the sta... View full abstract»

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  • Equiripple group delay digital filter sets for use in FSK modems

    Publication Year: 1985, Page(s):478 - 481
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    Frequency shift keyed data signals may be demodulated by splitting the message signals into two spectral bands and comparing the received signal energy in the two bands. The band splitting filters in this type of demodulator are required to have both constant in-band group delay and matched group delay between the two bands. The problem considered in this paper is that of designing recursive digit... View full abstract»

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  • A bad example for the minimum feedback vertex set problem

    Publication Year: 1985, Page(s):491 - 493
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    Let A be a fully indecomposablen times n View full abstract»

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  • ARMA estimation by the classical predictor

    Publication Year: 1985, Page(s):506 - 507
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The relation between the parameters of an ARMA process and those of the equivalent AR process is investigated. On the basis of this relation an algorithm is proposed for determining the ARMA parameters from the values of the taps of the predictor obtained by applying any of the classical methods to the process under consideration. View full abstract»

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  • On prefilters for digital FIR filter design

    Publication Year: 1985, Page(s):494 - 499
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    A new family of digital prefilter structures is introduced, based on the Dolph-Chebyshev function. These prefilters can be combined with appropriately designed "equalizer" filters based on equiripple methods, leading to efficient FIR digital filter designs. Design examples are included, demonstrating the simplicity of the resulting designs, as compared to conventional equiripple designs. View full abstract»

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