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Circuits and Systems, IEEE Transactions on

Issue 11 • Date Nov 1979

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Displaying Results 1 - 15 of 15
  • Analysis of switched capacitive networks

    Publication Year: 1979 , Page(s): 935 - 947
    Cited by:  Papers (41)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1432 KB)  

    An efficient method is presented for the exact analysis of networks containing capacitors, independent and dependent voltage sources, and switches. Both continuous and piecewise-constant arbitrary inputs are handled, and solutions are presented for both transient response and frequency response. The switching pattern can be periodic (with any number of subintervals per period) or nonperiodic. The formulation proposed can be efficiently implemented on the computer and provides for user convenience; only one network topology and the switching schedule must be specified (as opposed to specifying as many topologies as there are switch position combinations). The method is especially well suited for the analysis of the recently introduced switched capacitor filters and charge redistribution circuits. View full abstract»

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  • Digital interpolation of stochastic signals

    Publication Year: 1979 , Page(s): 916 - 922
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (784 KB)  

    The process of interpolation seems to be of importance in some areas of digital signal processing, as speech processing, modulation systems and others. Several techniques have been proposed in the past, all of them utilizing a low-pass digital filter, and some of them are optimal in terms of the computation minimization for given design specifications. The common characteristic of these filters is that they are fixed, since they have been constructed, regardless of the structure of the signal to be processed. A new point of view is developed in this paper, where an optimum filter is proposed which takes into account the statistical properties of the stochastic input signal and especially its correlation function. Algorithms and closed forms are suggested, depending on the complexity of the interpolation and the application. In addition, computer simulation results are presented to confirm the validity of the theoretical results, and finally, some open problems are briefly discussed. View full abstract»

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  • Applications of Takahasi's results to broadband matching for microwave amplifiers

    Publication Year: 1979 , Page(s): 970 - 973
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (424 KB)  

    This paper presents simple formulas for broad-band matching microwave amplifiers, such as input, output, or interstage matching of GaAs FET amplifiers and IMPATT diode reflection amplifiers using lossless ladder low-pass and bandpass Chebyshev networks based upon the results of Takahasi. The method bypasses the gain-bandwidth theory and produces lumped lossless equalizers which can be readily approximated by distributed circuits which require few iterations of optimizations to yield the performance of their lumped counterparts. View full abstract»

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  • Driving-point synthesis of a resistor-terminated cascade composed of lumped lossless two-ports and commensurate stubs

    Publication Year: 1979 , Page(s): 947 - 955
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (800 KB)  

    The necessary and sufficient conditions are derived, for the realization of a two-variable impedance function as a resistor-terminated cascade of arbitrary lossless lumped two-ports and commensurate, series short-circuited and shunt open-circuited, stubs. It is shown that in addition to the two-variable positive real condition and the appropriate location of the zeros of the even part, the given impedance function must satisfy certain algebraic constraints. View full abstract»

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  • On the quantization noise contributions in digital filters which are uncorrelated with the output signal

    Publication Year: 1979 , Page(s): 901 - 910
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1160 KB)  

    If quantization in digital filters is performed by means of magnitude truncation or related methods, the various quantization noise signals are correlated with each other and with the signal to be transmitted. Also the resulting quantization noise at the filter output exhibits partial correlation with the output signal. In many cases the correlated part of this noise need not be considered as disturbance, because it can be viewed as emanating from a fictitious linear system excited by the same signal as the main system. After combination of these two systems the correlated noise contribution can be Interpreted as a weak linear distortion of the original transmission characteristic. In this paper the spectral power density of the uncorrelated noise only is determined, which can be ascribed to the nonlinear effects of quantization. In many practical cases, this uncorrelated noise carries a power which is substantially lower than that of the total quantization noise. View full abstract»

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  • The zero-input response of digital filters using saturation arithmetic

    Publication Year: 1979 , Page(s): 911 - 915
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (640 KB)  

    It is known that second-order digital filters realized in direct form using saturation arithmetic have the property that the amplitudes of all self-sustained limit cycles can be made arbitrarily small by increasing the numbers of bits associated with the representation of the data samples. In this paper we observe that a recent extension to certain higher order cases of an idealized version of that result (quantization is ignored in the Idealized model) is a direct corollary of a theorem in the theory of feedback systems, and that the extension (and related more general propositions) can be proved without the earlier theorem by using simple operator-theoretic methods. The main result given in the paper is an extension of the result for nonidealized second-order sections to a class of filters of arbitrary order. View full abstract»

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  • On the realization of immittance inverters with a minimum number of active components

    Publication Year: 1979 , Page(s): 931 - 935
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (688 KB)  

    It is proved that in a grounded 2-port (i.e., a 2-port in which both ports have a common terminal which can be grounded) containing resistors and either one operational amplifier (with differential input and grounded output) or one ideal transistor, the admittance parameters are such that If y_{11}=0 then y_{21} \leq 0 , and if Y_{22}=0 then y_{12}\leq 0 . One consequence of this is that a grounded positive inverter cannot be realized with only one operational amplifier or one ideal transistor (it is known that although the realization of a gyrator requires at least two amplifiers or two transistors, positive inverters can be realized with only one amplifier if only one port is grounded; it is not known whether single-transistor positive inverters are possible). Other consequences concerning the realization of various types of immittance inverters are also discussed. View full abstract»

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  • A simultaneous analog-to-quaternary converter

    Publication Year: 1979 , Page(s): 967 - 970
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (456 KB)  

    The function of an analog-to-quaternary (A/Q) converter is to convert an analog input voltage into a quaternary output word. In this correspondence, a simple simultaneous analog-to-quaternary converter which makes use of new current-mode quaternary threshold logic circuits is described. View full abstract»

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  • Transitional rational filters

    Publication Year: 1979 , Page(s): 976 - 979
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (368 KB)  

    Transitional rational XY filters (TRXY) with rational transfer functions are considered having characteristics that vary smoothly from those of filter X to those of filter Y as certain parameters are varied continuously. The X and Y filters are chosen as various combinations of the ultraspherical rational filter, the generalized Bessel rational filter and the inverse Chebyshev filter. View full abstract»

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  • Monotonic magnitude response with equal ripple sensitivity

    Publication Year: 1979 , Page(s): 980 - 983
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (344 KB)  

    Sensitivity of all pole filters with critical monotonic (CM) magnitude characteristic is optimized in a mini-max sense, and a new class of transitional monotonic filters is introduced. Comparison with other monotonic filters is also given. View full abstract»

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  • Effect of amplifier imperfections on active networks

    Publication Year: 1979 , Page(s): 922 - 931
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1248 KB)  

    The deviation in the performance of active networks due to practical operational amplifiers (OA) is mainly because of the finite gain bandwidth product B and nonzero output resistance R_0 . The effect of B and R_0 on two OA impedances and single and multi-OA filters are discussed. In filters, the effect of R_0 is to add zeros to the transfer function often making it nonminimum phase. A simple method of analysis has been suggested for 3-OA biquad and coupled biquad circuits. A general method of noise minimization of the generalized impedance converter (GIC), while operating OA's within the prescribed voltage and current limits, is also discussed. The 3-OA biquadratic sections analyzed also exhibit noise behavior and signal handling capacity similar to the GIC. The GIC based structures are found to be better than other configurations both in biquadratic sections and direct realizations of higher order transfer functions. View full abstract»

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  • A new algorithm for computing a single root of a real continuous function

    Publication Year: 1979 , Page(s): 979 - 980
    Cited by:  Papers (3)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (192 KB)  

    A fast and simple iterative method is proposed for the determination of a single real root of a real continuous function. The idea is based upon linearizing the original function whereafter the regula falsi is applied to this modified function which leads to a very simple algorithm. The rate of convergence is shown to be quadratic or better. View full abstract»

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  • Forwards, backwards, and dynamically reversible Markovian models of second-order processes

    Publication Year: 1979 , Page(s): 956 - 965
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1200 KB)  

    Related causal and anticausal models of second-order processes are studied; new properties are characterized in terms of associated matrix fraction descriptions. Situations in which related causal and anticausal models have the same transfer function matrix are examined in detail, and the models are shown to possess internal and external time-reversiblity properties. Connections with ideas of statistical mechanics and passive networks are also indicated. View full abstract»

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  • Number of irreducible q-ary polynomials in several variables with prescribed degrees

    Publication Year: 1979 , Page(s): 973 - 975
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (328 KB)  

    In this article, a procedure is given to determine the number of distinct irreducible polynomials of prescribed degree in each of the independent variables, and having coefficients over a finite field of q elements. For brevity In exposition, the 2-D case is discussed in detail and scopes for further research with potentialities for engineering applications of the results are cited. View full abstract»

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  • Practical system inversion without impulse response approximation

    Publication Year: 1979 , Page(s): 965 - 967
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (376 KB)  

    A procedure is described for finding the input sequence of a linear system given the output sequence. The system need not be minimum phase though it cannot have unit circle zeros. The method does not involve impulse response approximations, but does rely in the general case on the availability of a storage medium such as tape. Errors are introduced by initial or terminal condition effects but these are guaranteed to have decaying influence as one moves away from the initial or terminal time. View full abstract»

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