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Circuits and Systems, IEEE Transactions on

Issue 12 • Date Dec 1991

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Displaying Results 1 - 22 of 22
  • A self-organizing switched-capacitor neural network

    Publication Year: 1991 , Page(s): 1556 - 1563
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (648 KB)  

    A novel analog realization of a self-organizing neural network using switched-capacitors is presented. The design is entirely synchronous and incorporates a `winner-take-all' circuit, as well as a circuit capable of computing the neural activity required by the dot product operation. A switched-capacitor circuit capable of implementing the basic learning law in self-organizing neural networks is a... View full abstract»

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  • On the design of FIR digital data transmission filters with arbitrary magnitude specifications

    Publication Year: 1991 , Page(s): 1563 - 1567
    Cited by:  Papers (19)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (444 KB)  

    A simple algorithm is presented for the design of FIR data transmission filters with arbitrary magnitude specifications. The technique involves the iterative solution of a set of linear equations as opposed to the more common approach of applying linear programming to the data transmission filter design problem. The design algorithm can accommodate conventional Nyquist filters or Nyquist filters w... View full abstract»

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  • Two-dimensional variable step-size sequential adaptive gradient algorithms with applications

    Publication Year: 1991 , Page(s): 1577 - 1580
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (444 KB)  

    The optimality criterion governing the choice of the convergence factor for the 2-D sequential adaptive gradient algorithms is developed. Two 2-D variable step-size sequential algorithms satisfying the proposed optimality constraint are derived and investigated. These are the 2-D individual adaptation (TDIA) algorithm and the 2-D homogeneous adaptation (TDHA) algorithm. The TDIA algorithm uses 2-D... View full abstract»

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  • Synchronization of chaos in phase-locked loops

    Publication Year: 1991 , Page(s): 1580 - 1588
    Cited by:  Papers (14)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (660 KB)  

    The first experimental demonstration that two phase-locked loops driven by a common chaotic signal derived from a master phase-locked loop can be synchronized under some suitably chosen but robust range of system parameters is reported. Experimental observations are completely consistent with both computer simulations and with the recent synchronization criterion due to L. M. Pecora and T. L. Carr... View full abstract»

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  • Constrained-input/constrained-output stability for adaptive RLS lattice filters

    Publication Year: 1991 , Page(s): 1478 - 1483
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (460 KB)  

    A new approach to characterizing the stability of adaptive filters is presented. The notion of constrained-input/constrained-output (CICO) stability is introduced as a generalization of the standard notion of bounded-input/bounded-output (BIBO) stability. This new notion involves a set of constraints on the filter data (i.e., signals and parameters) that, unlike boundedness, are specific to the fi... View full abstract»

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  • Fault-tolerant round-robin A/D converter system

    Publication Year: 1991 , Page(s): 1420 - 1429
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (756 KB)  

    A robust A/D converter system that requires much less hardware overhead than traditional modular redundancy approaches is described. A modest amount of oversampling generates information that is exploited to achieve fault tolerance. A generalized likelihood ratio test is used to detect the most likely failure and also to estimate the optimum signal reconstruction. The error detection and correctio... View full abstract»

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  • Cascade realization of a class of two-variable transfer functions

    Publication Year: 1991 , Page(s): 1451 - 1459
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (676 KB)  

    Necessary and sufficient conditions under which a two-variable rational function may be realized as the transfer function of a doubly terminated cascade of single-variable lumped, lossless reciprocal two-ports, of which each two-port is with respect to p1 or p2, are derived. It is noted that a set of realizability conditions presented and the approach to th... View full abstract»

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  • Linearization techniques for nth-order sensor models in MOS VLSI technology

    Publication Year: 1991 , Page(s): 1439 - 1450
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (880 KB)  

    The authors present new linearization techniques and introduce novel circuits for second- and third-order sensor models. Furthermore, a general framework as well as circuit techniques for linearization of sensor models of any order are presented. The new techniques are based on subtle circuit design of simple and compact multiplier/divider and vector multiplier circuits that comprise op-amps and M... View full abstract»

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  • Reality of chaos in four-dimensional hysteretic circuits

    Publication Year: 1991 , Page(s): 1517 - 1524
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (504 KB)  

    This paper gives rigorous evidence for chaos in a certain class of four-dimensional hysteretic circuits. The circuit dynamics are described by two symmetric three-dimensional linear equations which are connected to each other by hysteresis switchings. The author transforms the circuit equation into the Jordan form and derives the two-dimensional return map T. Then the author proves a suff... View full abstract»

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  • A BiCMOS image sensor circuit for pattern recognition neural network

    Publication Year: 1991 , Page(s): 1554 - 1556
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (276 KB)  

    The authors present a new image sensor with a chopper-stabilized edge detector and a correlated-double-sampling readout circuit, based on a 2-μm BiCMOS technology for pattern recognition neural network VLSI applications operating at 77 K. With the chopper-stabilized edge detector and the correlated-double-sampling readout technique, the two-dimensional photodiode array, which can be efficiently... View full abstract»

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  • A reduced-complexity finite field ALU

    Publication Year: 1991 , Page(s): 1571 - 1573
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (244 KB)  

    Computation by homomorphic images has been shown to be a viable technique for the VLSI implementation of real and complex arithmetic. Embedding the integers or the Gaussian integers into a direct sum of Galois fields has led to finite computational structures, which are multiplier-free; multiplication is replaced with finite field logarithm addition. While this led to an efficient realization of m... View full abstract»

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  • Waveform relaxation analysis of nonuniform lossy transmission lines characterized with frequency-dependent parameters

    Publication Year: 1991 , Page(s): 1484 - 1500
    Cited by:  Papers (55)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (980 KB)  

    An efficient method for the transient simulation of nonuniform frequency-dependent transmission lines is presented. The method consists of iterative waveform relaxation analyses of asymmetric disjoint two-port networks constructed with FFT waveform generators and characteristic impedances synthesized by applying the Gauss-Marquardt optimization technique. The method can also be adapted for discret... View full abstract»

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  • An information theoretic design and training algorithm for neural networks

    Publication Year: 1991 , Page(s): 1542 - 1547
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (556 KB)  

    An algorithmic approach to designing feedforward neural networks for pattern classification is presented. The technique computes a single hidden layer of nodes by adding one node at a time until the desired classification has been achieved. At each iteration, a node that maximizes an information theoretic measure is selected from a collection of candidates. The methodology is heuristic in nature, ... View full abstract»

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  • Analog CMOS synaptic learning circuits adapted from invertebrate biology

    Publication Year: 1991 , Page(s): 1430 - 1438
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (820 KB)  

    Analog CMOS circuits implementing abstractions of certain biological synaptic processes are presented. In particular, the circuits extract features of synaptic learning observed in the marine mollusk Aplysia. Two types of nonassociative learning, habituation and sensitization, as well as associative learning (classical conditioning), are modeled. The synaptic learning rules used by Aplysia are con... View full abstract»

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  • Design of 2-D digital filters with octagonal passband and stopband boundaries

    Publication Year: 1991 , Page(s): 1534 - 1542
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (728 KB)  

    A method for the design of 2-D digital filters with octagonal passband and stopband boundaries is described. The method involves cascading four 1-D FIR (finite impulse response) or IIR (infinite impulse response) digital filters. Consequently, it is easy to apply and leads to fast, economical, and efficient designs. By choosing appropriate passband- and stopband-edge frequencies for the 1-D filter... View full abstract»

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  • On discretization of continuous-time state-space models: a stable-normal approach

    Publication Year: 1991 , Page(s): 1460 - 1477
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1176 KB)  

    The problem of developing discrete-time models for continuous-time systems from some closed-form discretizing transformations is discussed. Stable forms of normal interpolators and integrating operators, which are of key issue in an associated normal class of transformations, are given, and their approximating properties are shown in the frequency domain. Generic forms of state-space models obtain... View full abstract»

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  • A digital filter structure with constant output roundoff noise level independent of filter bandwidth

    Publication Year: 1991 , Page(s): 1547 - 1551
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (444 KB)  

    It is shown that the roundoff noise level of an all-pass filter realized in normalized lattice structure is approximately equal to a constant value that depends only on the filter's order for both fixed and floating point arithmetics. As a consequence, the parallel all-pass realization of a digital filter employing normalized lattice all-pass sections is shown to produce very low roundoff noise at... View full abstract»

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  • Transient analysis and sensitivity computation in piecewise-linear circuits

    Publication Year: 1991 , Page(s): 1525 - 1533
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (664 KB)  

    Basic relations are given for transient sensitivity computation of piecewise linear (PWL) circuits modeled by ideal diodes. A method is presented for computer-aided formulation and solution of the PWL transient sensitivity analysis problem using the adjoint network approach. An iterative complementary pivot algorithm is used for solving the original network equations, while the solution of the adj... View full abstract»

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  • Closed-form solutions for voltage pulse response of open, shorted, and loaded distributed RC thin film structure

    Publication Year: 1991 , Page(s): 1567 - 1571
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (260 KB)  

    A closed-form solution is presented for a uniformly distributed open, shorted, and loaded RC thin film structure, for voltage pulse response, using bisection technique. Laplace transformation, Heaviside theorem, and contour integration algorithms. The voltage and current transient responses are plotted for different normalized load, time, and pulsed-width parameters. Verification of the l... View full abstract»

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  • On the asymptotic analysis of the smoothed least mean square algorithm and the relation with other LMS-type algorithms

    Publication Year: 1991 , Page(s): 1551 - 1554
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (328 KB)  

    The asymptotic performance of the smoothed least mean square (SLMS) algorithm is investigated. It is found that the convergence speed of the SLMS algorithm is approximately equal to that of LMS algorithm in practical applications. Based on the results obtained, the relation between the SLMS algorithm and other LMS-type algorithms is considered View full abstract»

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  • A simplified synthesis of lossless cascade analog and digital two-port networks

    Publication Year: 1991 , Page(s): 1501 - 1516
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1144 KB)  

    A synthesis algorithm for the cascade (chain) decomposition of lossless, real two-port networks is presented, which eliminates the need for performing basic polynomial operations such as factorization, division, root extraction, and continued fraction expansion. The algorithm is based on characterizing each elementary section of order one or two minimally using the location of the transmission zer... View full abstract»

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  • A frequency-domain LMS comb filter

    Publication Year: 1991 , Page(s): 1573 - 1576
    Cited by:  Papers (1)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (284 KB)  

    A new application of the least mean squares algorithm (LMS) to signal analysis and enhancement is presented. The LMS is implemented in the frequency domain to simulate a fixed-notch filter that nulls sinusoids with harmonically related frequencies. In the proposed structure, the Fourier transform (FT) block length is set to represent the fundamental period of the undesired periodic signal. The pap... View full abstract»

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