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Circuits and Systems, IEEE Transactions on

Issue 3 • Date March 1984

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Displaying Results 1 - 18 of 18
  • Comments on "Decision Methods and Realizations os 2-D Digital Filters Using Minimum Number of Delay Elements

    Publication Year: 1984 , Page(s): 308 - 310
    Cited by:  Papers (2)
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  • A novel SC oscillator

    Publication Year: 1984 , Page(s): 310 - 312
    Cited by:  Papers (3)
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  • Correction to 'The relationships between different measures of nonlinear distortion in single-amplifier active filters' (Nov 83 842-846)

    Publication Year: 1984 , Page(s): 315 - 316
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  • Correction to 'Description and realization of resistive n- port networks' (Oct 83 768-770)

    Publication Year: 1984 , Page(s): 316
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  • Corrections to 'A voltage-controlled resistance with wide dynamic range and low distortion' (Oct 83 770-772)

    Publication Year: 1984 , Page(s): 316
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  • Maximum amplitude zero-input limit cycles in digital filters

    Publication Year: 1984 , Page(s): 266 - 275
    Cited by:  Papers (17)
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    An algorithm is developed for finding maximum amplitude zero-input limit cycles in recursive digital filters. Computer results are given which establish the feasibility of our algorithm and determine the tightness of previously published limit-cycle bounds. It is also shown that the maximum amplitude limit-cycle problem can be formulated as an integer linear program. View full abstract»

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  • Block floating-point distributed filters

    Publication Year: 1984 , Page(s): 300 - 304
    Cited by:  Papers (8)
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    Distributed filters have been shown to offer an impressive complexity-throughput tradeoff. In this correspondence, a precision improvement is made in distributed filtering using block floating-point arithmetic. Performance improvement is predicted and verified using numerical experimentation. Using this scheme, additional distributed filter precision can be obtained. View full abstract»

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  • Slew-induced distortion of single-amplifier active filters using the gain-sensitivity product concept

    Publication Year: 1984 , Page(s): 306 - 308
    Cited by:  Papers (1)
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    The Volterra-Wiener series is used to obtain an analytical formula for slew-induced distortion (SID) in single-amplifier active filters. It is shown that the relative change of the transfer function caused by SID depends on the parameters of the operational amplifier (OA) and on the method of frequency compensation applied to it. This change also depends on the transfer function to be realized, on the amplitude of the input signal and on the gain-sensitivity product (GSP). It is shown that reducing the GSP also reduces the SID. The corresponding relationship was verified experimentally. View full abstract»

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  • On selectivity properties of discrete-time linear networks

    Publication Year: 1984 , Page(s): 275 - 280
    Cited by:  Papers (9)
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    A definition of the quality factor Q and the resonant angle \theta_{0} for discrete-time networks is presented. The definitions are based on the bilinear transform. Using this transform, the selectivity properties for discrete-time networks, such as switched capacitor (SC) and digital filters, are consistent with analog networks. Expressions for Q and \theta_{0} in terms of polar coordinate parameters r and \theta_{p} for a complex-conjugate pole pair and x_{1} and x_{2} for real-axis poles are given as well as the inverse relations. Canonic expressions for generic forms of a biquadratic function are also given. Finally, an accurate method for measurement of the parameters in second-order SC-filters and digital filters implemented in software is described. View full abstract»

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  • Bifurcation of periodic responses in forced dynamic nonlinear circuits: Computation of bifurcation values of the system parameters

    Publication Year: 1984 , Page(s): 248 - 260
    Cited by:  Papers (42)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1528 KB)  

    In the computer-aided experimental analysis of dynamic nonlinear circuits, the determination of the bifurcation value of system parameters for various types of periodic response is one of the central problems. A bifurcation diagram composed by the sets of bifurcation values exhibits various nonlinear phenomena, such as the coexistence of several periodic responses which are correlated with the jump and hysteresis behaviors, the frequency entrainment, the appearance of quasi-periodic responses and chaotic states, etc. In engineering application the bifurcation diagram can be used for designing dynamic nonlinear circuit with prescribed characteristics. In this paper, we present some computational algorithms which determine the bifurcation values of periodic responses. Our algorithms are based on the geometric approach of ordinary differential equations. Newton's method is effectively used for finding the bifurcation value. The Jacobian matrix is evaluated by the solutions of variational equations. Numerical examples for the second-order systems are illustrated. Some global properties of bifurcation sets of periodic responses are discussed. View full abstract»

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  • Optimum adaptive algorithms with applications to noise cancellation

    Publication Year: 1984 , Page(s): 312 - 315
    Cited by:  Papers (17)
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    A new simple formulation for the choice of the optimum convergence factor \mu in adaptive filtering using gradient techniques is given. This leads to several optimum adaptive filtering algorithms each of which is optimum under the conditions it was derived. Several of these algorithms have been tested successfully proving their optimality and yielding faster and more accurate adaptation compared with the existing conventional algorithm CA that uses fixed or imperical \mu . Two algorithms are derived and examined here. The first, the Homogeneous Algorithm HA, results in a time varying \mu which is the same for each filter but is updated at each iteration to yield optimum performance. The second, the Individual Adaptation Algorithm (IAA), has a time varying \mu which is chosen suitably for each coefficient at each iteration. The performance of the HA and IAA always outperformed the CA. Computer simulations and experimental results are given which are in agreement with theory. View full abstract»

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  • A general property of the transformation matrices associated with the n-variable bilinear transformation

    Publication Year: 1984 , Page(s): 296 - 299
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (424 KB)  

    By applying the bilinear transformation to a n -variable polynomial, with n \geq 1 , one arrives at a rational function, the zeros of which represent the "transformed polynomial." Let Q be the matrix relating the coefficients of the original polynomial to those of the transformed polynomial. It is shown that the matrix Q has a unique property, namely, Q^{2} = kl , where k is a positive constant which is explicitly derived for the various cases discussed, and I is the unit matrix of the pertinent order. View full abstract»

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  • Periodicity and chaos in an autonomous electronic system

    Publication Year: 1984 , Page(s): 237 - 247
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1440 KB)  

    In this paper, a simple electronic circuit is analyzed from a qualitative viewpoint. The circuit shows a great variety of dynamical behaviors (equilibrium points, periodic oscillations, chaotic motions... ) and the analysis proceeds to catalog all of them through a bifurcation study (pitchfork and Hopf bifurcations, flip bifurcations... ). This study points out the relevance of qualitative analysis in systems of simple structure but with very complex behavior. The paper includes theoretical study, numerical simulations, and actual circuit experimentation. View full abstract»

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  • Continuous and switched-capacitor multiphase oscillators

    Publication Year: 1984 , Page(s): 280 - 293
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1440 KB)  

    This paper presents novel designs of multiphase oscillators. These oscillators generate n symmetric signals, i.e., equal in amplitude and equally spaced in phase, which have a wide range of applications in communications and signal processing. First, multiphase oscillators based on active sequence discriminators (SD's) are proposed. Then multiphase oscillators based on the SD and two-integrator-loop circuits containing only capacitors, switches, and op amps are derived. In addition to the fact that these switched-capacitor oscillators (SCO's) are easily constructed in IC form using MOS technology, they are shown to possess other attractive features. The input to the switched-capacitor (SC) circuit is a clock and the output is a sampled-and-held sinusoid of a frequency that is related to the clock frequency by an arbitrarily chosen capacitor ratio. The oscillation frequency follows linearly a continuously varying clock. Thus there is no need to vary any of the oscillator components to change the oscillation frequency. Ultralow oscillation frequencies can be generated using practical component values. The harmonic content can be made very small by increasing the number of samples in each oscillation cycle. Also, the amplitude stabilization and control circuitry with excellent settling properties are presented. It is shown that the complexity of the amplitude stabilization circuitry does not increase with the number of oscillator phases in the SD oscillator design. Experimental results using both the continuous and SC realizations are given which are in agreement with the theory presented. View full abstract»

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  • Some efficient digital prefilter structures

    Publication Year: 1984 , Page(s): 260 - 266
    Cited by:  Papers (52)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (776 KB)  

    A new approach to the design of low complexity FIR digital filters was presented in [1]. The essence of the method is to separate the design problem into two parts: the realization of an efficient prefilter and the design of the corresponding equalizer. This separation allows the filter designer to focus on the computational complexity issue within the simplified context of the prefilter network. In this paper, we consider the use of various digital prefilter structures. The number of possibilities for digital prefilters is unlimited, so that our treatment cannot be exhaustive. However, our study does provide a quantitative sense of the level of reduction in computational complexity that can be achieved by the use of an appropriately designed prefilter. View full abstract»

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  • An algorithm for a 2-D continued fraction inversion

    Publication Year: 1984 , Page(s): 304 - 306
    Cited by:  Papers (2)
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    This paper indicates that the one-shot algorithm proposed recently by John and Parthasarathy for inverting a one-dimensional (1-D) continued fraction can be extended to the two-dimensional (2-D) case by merely using polynomial coefficient array (PCA) to represent a 2-D polynomial. View full abstract»

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  • Shorted operators and the identification problems-The real case

    Publication Year: 1984 , Page(s): 299 - 300
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    This paper gives necessary and sufficient conditions under which a real symmetric nonnegative definite matrix can be uniquely determined from the knowledge of a finite number of its shorted versions. View full abstract»

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  • A theorem on general LC-R ladder filters

    Publication Year: 1984 , Page(s): 293 - 296
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    It is shown that any real rational function with arbitrary zeros and pure imaginary poles, all preassigned except for a factor p^{r} in either the numerator or denominator, is the characteristic function of a filter which may be realized by a transformerless, inductance, capacitance ladder terminated in resistance if r is sufficiently great. View full abstract»

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