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Circuits and Systems, IEEE Transactions on

Issue 11 • Date November 1975

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Displaying Results 1 - 11 of 11
  • On the evaluation of roundoff noise in digital filters

    Publication Year: 1975 , Page(s): 896
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (91 KB)  

    The usual method of measuring the roundoff noise generated in a digital filter may lead, at least in case of sign-magnitude truncation, to an excessive result due to incomplete cancellation of the useful output signal. A simple method for determining a corresponding corrective term is presented. View full abstract»

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  • Comments on "Synthesis of Spectrum Shaping Digital Filters of Recursive Design

    Publication Year: 1975 , Page(s): 896 - 897
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (200 KB)  

    The problem of designing recursive digital filters can be reduced to polynomial approximation on a finite interval. The procedure to demonstrate this equivalence described in a recent paper yielded filters with multiple poles. An alternative method is described which avoids this restriction. View full abstract»

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  • Self-similar solution of distributed linear and nonlinear networks

    Publication Year: 1975 , Page(s): 882 - 886
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (560 KB)  

    The method of "self-similar solution of partial differential equations" is introduced and applied to the distributed RGC network. For linear networks convolution integrals, V(x,t) = V_{\delta } \times V_{source} and V(x,t) = V_{\delta '} \times I_{source} are obtained where V_\delta and V_\delta ' are, respectively, the responses to the \delta function voltage and current sources found and from the self-similar analysis, and V_source and I_{source} \propto \partial V_{source}/\partial x are arbitrary voltage and current sources. For certain sources, these integrals have been performed and the results will be presented. The technique is also successfully applied to nonlinear networks which are useful in modeling various microelectronic circuit components. View full abstract»

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  • On transient optimization criteria

    Publication Year: 1975 , Page(s): 898 - 900
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (312 KB)  

    A problem of current interest is that of optimizing decay characteristics of asymptotically stable dynamical systems in terms of certain system parameters. In the recent literature, a necessary condition for optimality has been proposed. It is shown here that the proposed condition has not been adequately established and a characterization is given for situations where the conditions may fail to apply. In a special case, the proposed condition is shown to be valid. View full abstract»

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  • On the relation between pseudo-passivity and hyperstability

    Publication Year: 1975 , Page(s): 897 - 898
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (232 KB)  

    This paper shows that the concept of pseudo-passivity of Fettweis et al. is a special case of V. M. Popov's concept of hyperstability. View full abstract»

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  • Heuristic techniques in computer-aided circuit analysis

    Publication Year: 1975 , Page(s): 857 - 865
    Cited by:  Papers (26)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1232 KB)  

    A new kind of circuit analysis program, EL, is presented. Whereas other circuit analysis systems rely on classical, formal, analysis techniques, EL employs heuristic "inspection" methods to solve rather complex dc bias circuits. These techniques also give EL the ability to explain any result in terms of its own qualitative reasoning processes. EL's reasoning is based on the concept of a "local one-step deduction" augmented by various "teleological" principles and by the concept of a "macro-element." Several annotated examples of EL in operation and an explanation of how it works are presented. Also how EL can be extended in several directions, including sinusoidal steady-state analysis is shown. Finally, the possible implications of this work for engineering education and computer-aided design technology are discussed briefly. EL is significant not only as a novel approach to circuit analysis but also as an application of Artificial Intelligence techniques to a new and interesting domain. View full abstract»

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  • Optimal domination in graphs

    Publication Year: 1975 , Page(s): 855 - 857
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB)  

    Graph theoretic techniques provide a convenient tool for the investigation of communication networks. Here a communication network is represented by a nonoriented linear graph, in which the edges represent communication links and the vertices represent cities. A transmitting group is a set of cities which, acting as transmitting stations, can transmit messages to every city in the network. Stated graph theoretically, a transmitting group is a dominating set, i.e., a set of vertices D having the property that any vertex not in D is adjacent to at least one vertex in D . The problem of finding disjoint dominating sets in a graph is studied, in particular, the domatic number d(G) of a graph G is defined as the maximum order of a partition of the vertices of G into dominating sets. View full abstract»

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  • Quantization noise analysis for fixed-point digital filters using magnitude truncation for quantization

    Publication Year: 1975 , Page(s): 887 - 895
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (928 KB)  

    Two methods are described for the determination of the quantization errors in digital filters using magnitude truncation quantization. The first method is very accurate but rather cumbersome for numerical analysis. The second method overcomes this disadvantage and uses a quasi-linearization technique. Results are given that indicate the very good agreement between computations and results of simulations, both for a second-order and for a tenth-order recursive digital filter. View full abstract»

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  • Single amplifier functionally tunable low-pass-notch filter

    Publication Year: 1975 , Page(s): 875 - 881
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (696 KB)  

    The canonical network developed in this paper is an active RC negative feedback arrangement that uses a single op-amp and two capacitors to realize low-pass-notch filter characteristics. The filter parameters are adjustable through resistive trimming. This functional tuning process uses a signal generator, a dB-scale voltmeter and a phase meter. The analytical design procedure takes into account a single-pole amplifier model. The network has low-passive sensitivities and is suitable for moderate- Q applications ( Q \leq 5 ). An example is discussed giving the resistor's limits for a \pm 10 percent capacitance tolerance. View full abstract»

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  • Automatic IC layout: The model and technology

    Publication Year: 1975 , Page(s): 845 - 855
    Cited by:  Papers (2)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1216 KB)  

    A procedure to obtain the topological data necessary for a proper layout of a monolithic integrated circuit in planar technology is presented. The first section gives a short summary of the graph theoretic formulation of the layout problem. The "extended potential graph" is defined, of which planarity is necessary and sufficient for the existence of a layout satisfying a number of requirements. The second section extensively describes technological possibilities to planarize this graph. After the planarization of the potential graph, some additional data is needed for diffusions that are no longer represented in the modified potential graph. These data can be supplied by an optimization procedure described in the third section. Finally an example illustrates the contents of this paper and some concluding remarks give the relation of this procedure to existing literature in this field. View full abstract»

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  • Design formulas for stepped impedance distributed and digital wave maximally flat and Chebyshev low-pass prototype filters

    Publication Year: 1975 , Page(s): 866 - 874
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (704 KB)  

    Design formulas are obtained for the basic stepped impedance distributed low-pass prototype filter which exhibits a maximally flat or equiripple insertion loss response characteristic. Explicit formulas are given for the coefficients of a truncated power series in the bandwidth scaling factor for the characteristic impedances. For the low-sensitivity digital wave filter based upon this prototype, the multiplier values are given. Computer results on the analysis of the prototype filter using the new design equations are cited, showing the vast improvement over the narrow band, lumped element, explicit design formulas. View full abstract»

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