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IEEE Transactions on Circuits and Systems

Issue 2 • Feb 1991

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Displaying Results 1 - 11 of 11
  • An error-compensation A/D conversion technique

    Publication Year: 1991, Page(s):187 - 195
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (864 KB)

    An architecture for a successive-approximation analog-to-digital (A/D) converter using switched-capacitor techniques is described. The converter design consists of a comparator, two operational amplifiers, and several unit capacitors. The simplicity of the circuit is comparable to that of cyclic A/D converters. An error-compensation technique for reference generation is also proposed that improves... View full abstract»

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  • An alternative sensitivity measure for designing low-sensitivity digital biquads

    Publication Year: 1991, Page(s):218 - 221
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    A sensitivity measure is proposed for determining the optimum set of machine-representable multiplier constants in the derivation of low-sensitivity digital biquadratic filters. A comparison of this measure with two other sensitivity measures of this class is then undertaken using four different design examples. The four sixth-order filters considered are a Butterworth low-pass, a Chebyshev high-p... View full abstract»

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  • Generalized Bezoutians and families of efficient zero-location procedures

    Publication Year: 1991, Page(s):170 - 186
    Cited by:  Papers (43)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1220 KB)

    It is shown that the procedures of Routh-Hurwitz and Schur-Cohn for determining the zero-distribution of polynomials with respect to the imaginary axis and the unit circle, respectively, serve, at the same time, to efficiently evaluate the inertia of certain so-called Bezoutian matrices. These procedures require O(n2) operations to determine the inertia of an ... View full abstract»

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  • A purely capacitive synaptic matrix for fixed-weight neural networks

    Publication Year: 1991, Page(s):210 - 217
    Cited by:  Papers (17)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (684 KB)

    It is shown that the synaptic function of fixed-weight neural networks can be implemented using only one capacitor. The resulting synaptic matrix, being devoid of active devices, offers very high space-power efficiency and speed along with large synapse capacity with considerable analog depth. The generic capacitor matrix is analyzed on the basis of dendritic charge conservation. The results are u... View full abstract»

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  • A state-space approach to orthogonal digital filters

    Publication Year: 1991, Page(s):160 - 169
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    An algorithm for designing multi-input multi-output (MIMO) orthogonal digital filters is developed using a state-space approach. The algorithm consists of three parts: (i) orthogonal embedding, (ii) transformation of the embedded orthogonal transition matrix to the α-extended upper Hessenberg form; and (iii) factorization of this new form into Givens (planar) rotations. Appropriately interco... View full abstract»

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  • On a class of nonsymmetrical neural networks with application to ADC

    Publication Year: 1991, Page(s):202 - 209
    Cited by:  Papers (62)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    For nonzero initial conditions a neural network may stop in a spurious state-that is, in an equilibrium point that does not correspond to the correct digital representation of the input signal. A method based on a particular class of nonsymmetrical neural networks is proposed for eliminating the problem of stopping in spurious states. The dynamical behavior of these structures is studied to prove ... View full abstract»

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  • A comparison of modulator networks for high-order oversampled ΣΔ analog-to-digital converters

    Publication Year: 1991, Page(s):145 - 159
    Cited by:  Papers (85)  |  Patents (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1192 KB)

    After a discussion of the practical problem of comparing the relative performance of all known high-order modulator networks with respect to resolution, stability, input range, component sensitivities, finite amplifier gains, and bandwidths, equations are derived and verified by computer simulation that relate reduction in signal-to-noise ratio to component mismatch and finite amplifier gain, allo... View full abstract»

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  • On the analysis of dynamic feedback neural nets

    Publication Year: 1991, Page(s):196 - 201
    Cited by:  Papers (53)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    A formulation for dynamic feedback neural networks of the Hopfield type is presented. A description is given of the general design framework used, in which a neural network would only have a finite number of memories. Some basic properties of the nonzero equilibria as well as the (unstable) equilibrium point at zero in the proposed framework are also discussed View full abstract»

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  • A note on the modified stability table for linear discrete time systems

    Publication Year: 1991, Page(s):221 - 223
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    It is shown how to obtain the inner determinants of the stability determinantal criterion from the entries of the modified stability table. This requires the expansion of only 2×2 determinants instead of higher-order ones. This constitutes a computational simplification of the determinantal criterion. The results are the discrete analog of obtaining the Hurwitz minors from the Routh table View full abstract»

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  • Tunability of biquadratic responses

    Publication Year: 1991, Page(s):223 - 227
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A simple and efficient criterion for the selection of tuning parameters is introduced. This criterion uses the coefficients of the biquadratic response function exhibited in the frequency domain by certain lumped linear circuits. The tuning criterion takes into consideration the required large range of response variation with an associated small change in the tuning parameter and is based on an ov... View full abstract»

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  • Sensitivity analysis for a regulating transformer connected to a high impedance source

    Publication Year: 1991, Page(s):227 - 229
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    The sensitivity concept is used to quantify the effectiveness of a voltage regulating transformer or regulator used in an AC circuit where the objective is to raise the voltage across a load connected to a source with high source impedance. The sensitivity concept describes the effectiveness of the regulator under a set of conditions and confirms that the device is completely ineffective when the ... View full abstract»

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