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IEEE Transactions on Circuits and Systems

Issue 7 • July 1991

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Displaying Results 1 - 21 of 21
  • Comments on "A simple stability test for 2-D systems" by G.E. Antoniou et al

    Publication Year: 1991
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (55 KB)

    For original paper see ibid., vol.37, p.972-4 (1990). It is shown with an example that the stability test for all-pole 2-D systems given in the above-mentioned paper is not correct.<> View full abstract»

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  • Comments on "A naive approach to global optimization" by L.O. Chua

    Publication Year: 1991, Page(s):818 - 820
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (227 KB)

    For original paper see ibid., vol.37, p.966-9 (1990). The commenters point out certain practical problems with a recently published approach to global optimization, and also describe briefly an algorithm which does not suffer from these problems. They claim that their method can be implemented in circuit form and using neural networks.<> View full abstract»

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  • Comments, with reply, on "The proof of M/sub 12/=M/sup 21/ based on stored energy is incorrect" by P.M. Lin

    Publication Year: 1991, Page(s):820 - 821
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (120 KB)

    For original paper see ibid., vol.36, p.1153-58 (1989). The commenter claims that the proof that M/sub 12/=M/sub 21/ based on stored energy is correct. He briefly reviews the author's arguments and conventional proofs. In his reply, P.M. Lin disagrees with the commenter.<> View full abstract»

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  • Systolic array implementation of multipliers for finite fields GF(2m)

    Publication Year: 1991, Page(s):796 - 800
    Cited by:  Papers (93)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    A parallel-in-parallel-out systolic array and a serial-in-serial-out systolic array are proposed for fast multiplication in finite fields GF(2m) with the standard basis representation. Both of the architectures possess features of regularity, modularity, concurrency, and unidirectional data flow. As a consequence, they have high throughput rates and are well suited to VLSI impl... View full abstract»

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  • IIR transfer function design with a double-objective differential correction algorithm

    Publication Year: 1991, Page(s):791 - 796
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    Proposes an extension of the differential correction algorithm for simultaneous design of real and imaginary parts of IIR (infinite impulse response) transfer functions in minimax norm. The implementation of the proposed algorithm requires the iterative solution of a minimization problem having linear objective and quadratic constraints. The method is globally convergent and it can be proven to de... View full abstract»

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  • Interconnection delay in very high-speed VLSI

    Publication Year: 1991, Page(s):779 - 790
    Cited by:  Papers (46)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    Interconnection delay of VLSI in high-speed digital systems is addressed. A formal analysis of the signal propagation delay in VLSI circuits is presented. It is shown that, depending on the circuit parameters, there are basically two delay domains: the RC delay domain and the transmission-line-delay domain. The results derived from the more traditional lumped-RC model mainly capt... View full abstract»

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  • A CNN chip for connected component detection

    Publication Year: 1991, Page(s):812 - 817
    Cited by:  Papers (103)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    The first working chips that implement a cellular neural network (CNN) are reported. They have been integrated in a CMOS 2-μm technology, and are intended for connected component detection processing applications. The operation is made in continuous time using analog circuitry. The design, fabrication, and testing of these chips are presented View full abstract»

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  • Continuous-time LMS adaptive recursive filters

    Publication Year: 1991, Page(s):769 - 778
    Cited by:  Papers (41)  |  Patents (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (972 KB)

    An approach for implementing continuous-time adaptive recursive filters is presented. The resulting filters should be capable of operating on much higher signal frequencies than their digital counterparts since no sampling is required. With respect to implementation problems, the effects of DC offsets are investigated and formulas derived so that these effects can be estimated and reduced. It is s... View full abstract»

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  • Pipelining in algorithms with quantizer loops

    Publication Year: 1991, Page(s):745 - 754
    Cited by:  Papers (56)  |  Patents (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    High-speed implementation of signal processing algorithms for digital transmission is addressed. The internal feedback or recursion in these algorithms makes it difficult to implement recursive systems concurrently using either pipelining or parallelism. In the past, look-ahead computation techniques were successfully applied to create necessary concurrency in linear recursive and some nonlinear r... View full abstract»

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  • A chaotic attractor with cellular neural networks

    Publication Year: 1991, Page(s):811 - 812
    Cited by:  Papers (68)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (132 KB)

    A chaotic attractor has been observed with a nonautonomous cellular neural network (CNN) using an opposite-sign template. The network consists of only two cells and is driven by a sinusoidal input. It possesses the horseshoe structure. The map shows multiple strongly stretching and folding processes of the volume of flow. The attractor has interesting fractal structures View full abstract»

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  • Aggregation properties of linearized two-time-scale power networks

    Publication Year: 1991, Page(s):720 - 730
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (836 KB)

    In the slow coherency approach, the slow coherent areas of a power system are aggregated to form a slow subsystem to model the dynamics of the interchange between the areas. The aggregation process associated with the slow coherency approach that uses the singular perturbation technique to correct for the internal connections within the coherent areas to generate improved slow aggregates is discus... View full abstract»

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  • On frequency-wavenumber estimation by state-space realization

    Publication Year: 1991, Page(s):800 - 804
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    A frequency-wavenumber estimation problem usually requires a computationally expensive numerical search over a 2-D parameter space for the maximum or minimum of a function. A method using state-space models has been proposed. This method decomposes the 2-D problem into two 1-D problems and provides an analytical solution (i.e., without searching) in each dimension separately. It is shown how the s... View full abstract»

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  • Proof of the number of independent Kirchhoff equations in an electrical circuit

    Publication Year: 1991, Page(s):681 - 684
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    A compact inductive proof is presented that the number of linearly independent KCL (Kirchhoff's current law) node equations of b-branch n-node connected circuits is n-1 and the number of independent KVL (Kirchhoff's voltage law) loop equations is b-n+1. Because it is easily illustrated pictorially and does not rely on graph theoretic concepts it is suit... View full abstract»

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  • New results on stable multidimensional polynomials. III. State-space interpretations

    Publication Year: 1991, Page(s):755 - 768
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1188 KB)

    Lyapunov characterization of scattering Schur, reactance Schur, and immittance Schur properties of multidimensional polynomials are given. Since these polynomials arise in the description of passive systems, energy-like functions can be conveniently defined for such systems, thus making Lyapunov-type characterization readily available. It is shown that the notion of modal observability and its fur... View full abstract»

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  • A class of noniterative estimators for nonlinear image restoration

    Publication Year: 1991, Page(s):731 - 744
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1284 KB)

    Noniterative estimators for the nonlinear image restoration problem are investigated. A general, nonlinear image formation model is considered in conjunction with a minimum-mean-square-error (MMSE) restoration approach. In the special case of a logarithmic nonlinearity, the optimal estimator is analytically derived within the class of algorithms that involve the inverse of the system's nonlinearit... View full abstract»

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  • Small-signal analysis and minimum settling time design of a one-stage folded-cascode CMOS operational amplifier

    Publication Year: 1991, Page(s):804 - 807
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    A small-signal analysis of the single-ended one-stage folded-cascode CMOS operational amplifier is presented. The analysis results in a four-pole two-zero representation from which a two-pole model is extracted that is sufficiently accurate for many applications in switched-capacitor (SC) circuits. A design equation for obtaining the minimum settling time (MST) response for SC applications is give... View full abstract»

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  • Novel analog-digital converters using voltage inverter switches. II. applications

    Publication Year: 1991, Page(s):685 - 693
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    For pt.I see ibid., vol.38, no.6, p.582-589 (1991). The use of voltage inverter switches (VIS) in analog-to-digital converter (ADC) circuits is described. In the first part of this paper VIS circuits were introduced, and their use in voltage reference circuits was demonstrated. In this second part, these reference circuits are incorporated into novel ADC circuits. Six different circuits are presen... View full abstract»

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  • Overflow oscillations in state-space digital filters

    Publication Year: 1991, Page(s):807 - 810
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    A sufficient condition is established for the stability of general state-space digital filters implemented with two's complement arithmetic for the addition operation. A necessary and sufficient condition is established for the existence of period-T limit cycles in second-order direct-form digital filters. This theorem can be used to determine existence regions in the parameter plane for ... View full abstract»

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  • Class D synchronous rectifiers

    Publication Year: 1991, Page(s):694 - 697
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    A current-driven synchronous regulated class D rectifier is presented. An analysis of the rectifier is presented, and parameters are given. An advantage of the proposed circuit is that peak values of voltages across its elements are relatively low if compared with its output voltage. A symmetry between the rectifier and the voltage-switching half-bridge resonant class D amplifier is shown. Due to ... View full abstract»

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  • Consistent initial conditions of nonlinear networks with switches

    Publication Year: 1991, Page(s):698 - 710
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1016 KB)

    In the analysis of switched networks discontinuity of network variables and the presence of impulsive voltages and currents at the switching instants are often encountered. A theory for obtaining consistent initial conditions of electrical networks containing ideal switches and impulsive sources is proposed. The method is based on charge and flux conservation, and requires the solution of three on... View full abstract»

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  • On the representation of infinite-length distributed RC one-ports

    Publication Year: 1991, Page(s):711 - 719
    Cited by:  Papers (91)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    Representations of infinite distributed RC one-ports are described. Two functions are introduced: the dipole intensity function (as the generalization of pole-zero pattern) and the time-constant density (as the generalization of the discrete time-constant set of a lumped network). Relations between these representations and the complex impedance are presented. These representations can be... View full abstract»

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