By Topic

Circuits and Systems, IEEE Transactions on

Issue 9 • Date Sep 1980

Filter Results

Displaying Results 1 - 16 of 16
  • Improved methods of assessing feedback in wide-band multiloop amplifiers

    Publication Year: 1980 , Page(s): 779 - 792
    Cited by:  Papers (5)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1752 KB)  

    A pressing problem in modern, wide-band feedback amplifiers is to obtain reliable information on margins against self-oscillation. The application of Bode's general and exact theory of feedback to practical circuits of considerable complexity, such as a complete repeater, has been achieved by a new method based upon measurements over a very wide band of frequencies. Transistor models and circuit d... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the inadequacies of loop gain in broad-band, multiloop feedback amplifiers

    Publication Year: 1980 , Page(s): 843 - 848
    Cited by:  Papers (2)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (672 KB)  

    Experience in communications engineering has repeatedly shown that loop gain can be an unreliable basis for the assessment of stability margins in feedback amplifiers. There are both theoretical and practical reasons for this. A simple identity provides a sounder theoretical basis, and provides a novel way of looking at old problems. The presence of any unstable modes of the closed-loop amplifier ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Stability domains for second-order recursive digital filters in normal form with 'matrix power' feedback

    Publication Year: 1980 , Page(s): 841 - 843
    Cited by:  Papers (5)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (336 KB)  

    The allowable pole locations that will provide guaranteed immunity from finite-word limit cycles are derived for a class of secondorder normal digital filters. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Yield maximization and worst-case design with arbitrary statistical distributions

    Publication Year: 1980 , Page(s): 756 - 764
    Cited by:  Papers (25)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1056 KB)  

    We describe a method by which a variety of statistical design problems can be solved by a linear program. We describe three key aspects of this approach. 1) The correspondence between the level contours of a given probability density function and a particular norm, which we shall call a pdf-norm. 2) The expression of distance in this norm from a given set of hyperplanes in terms of the dual of the... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Injection locked tunable filters and amplifiers

    Publication Year: 1980 , Page(s): 833 - 836
    Request Permissions | Click to expandAbstract | PDF file iconPDF (440 KB)  

    The problem of realizing coherent filters and amplifiers using injection-lock technique has been discussed in this short communication. It deals with the behavior of an injection synchronized oscillator (ISO) under different situations: i) it evaluates the locking range of an ISO in response to an FM signal corrupted with an additive random noise, ii) it finds the coherent filtering capability, an... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An efficient algorithm reduces computing time in solving a system of stiff ordinary differential equations

    Publication Year: 1980 , Page(s): 747 - 755
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1032 KB)  

    The problem of stiff differential equations arises in many computer-aided design techniques, particularly in the transient analysis of network simulation. Special multistep methods are used to solve the first-order stiff nonlinear differential equations. Instability and a large number of steps are encountered during simulation. Different techniques such as step and order selection schemes, procedu... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A variance minimization approach to tolerance design

    Publication Year: 1980 , Page(s): 737 - 747
    Cited by:  Papers (3)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1152 KB)  

    This paper describes the development of a variance minimization strategy for the tolerancing of linear circuits and systems. The technique is conceptually simple and can be implemented through commonly available optimization routines. The applicability of the approach is illustrated through standard numerical examples. In addition the paper also derives a new expression for the variance of a syste... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An algorithm for single-row routing with prescribed street congestions

    Publication Year: 1980 , Page(s): 765 - 772
    Cited by:  Papers (27)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1000 KB)  

    The single-row routing approach for layout has attracted a great deal of interest and is in a position to become one of the fundamental routing methods for high density multilayer printed wiring boards (PWB's). A specific development has recently been accomplished on this approach [12], namely: Necessary and sufficient conditions for optimum routing have been obtained. Nonetheless, there still rem... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Signal and noise response of a spectrum expanse

    Publication Year: 1980 , Page(s): 804 - 815
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1288 KB)  

    A spectrum expander samples an analog input signal periodically, stores these samples cyclically in a series of digital registers, and reads out these samples cyclically at a higher rate. An analysis of the signal and noise response of this device is given here. The above spectrum expander is precisely equivalent to an analog system consisting of 1) a filter-bank spectrometer, whose filter transfe... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Variable digital filters

    Publication Year: 1980 , Page(s): 836 - 838
    Cited by:  Papers (1)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (368 KB)  

    IIR prototype filters cannot be used for the design of variable filters through Schüssler's all-pass transformation because of the occurrence of delay-free loops; no such problem arises with FIR prototypes. In this paper, the drawbacks of the latter type, with regard to computational efficiency and output roundoff noise, have been brought out, An approach is suggested, wherein the delay-free ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Canonic structures for lossless one-ports

    Publication Year: 1980 , Page(s): 772 - 778
    Cited by:  Papers (2)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (904 KB)  

    Necessary and sufficient topological conditions for a lossless 1-port to be canonic have been discovered and proved. All the currently known canonic structures, comprising the classical Foster and Cauer forms and the five more recently discovered networks, are special cases of the general class of canonic 1-ports described here. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An abstract-symbolic description of circuit structure

    Publication Year: 1980 , Page(s): 839 - 841
    Request Permissions | Click to expandAbstract | PDF file iconPDF (336 KB)  

    This report presents an alternative approach to pictorial description of circuits. A method is formulated and symbolism suggested for representing a circuit in terms of sequential, line-by-line symbolic statements. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The colored branch theorem and its applications in circuit theory

    Publication Year: 1980 , Page(s): 816 - 825
    Cited by:  Papers (14)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1384 KB)  

    The colored branch theorem (Minty 1960 [1]) is a result in graph theory, which essentially says that the existence (resp., nonexistence) of a certain loop immediately implies the nonexistence (resp., existence) of a certain cutset. Its relevance and use in circuit theory, however, has only recently been recognized. Since it is expected that many more applications in circuit theory will follow, the... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Multiple solutions of nonlinear equations: Roots of polynomials

    Publication Year: 1980 , Page(s): 825 - 832
    Request Permissions | Click to expandAbstract | PDF file iconPDF (904 KB)  

    A search method is presented for obtaining multiple solutions of a system of n nonlinear equations whose first (n- 1) equations do not necessarily define a unique space curve. In particular, the approach is used to find all the roots of a complex polynomial. Singularities on the space curve are analyzed and properly class... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Monotone resolution sequence spaces and mappings

    Publication Year: 1980 , Page(s): 800 - 804
    Request Permissions | Click to expandAbstract | PDF file iconPDF (608 KB)  

    A brief study of sequence spaces amenable to circuit and system analysis is presented. The main properties are shift and truncation operator invariance. A particularly useful class called monotone resolution space is then defined; and relations between linearity, causality, finite norm, invariance, finite gain, and boundedness of sequence mappings or these spaces are given by means of a Venn diagr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Parasitic pole approximation techniques for active filter design

    Publication Year: 1980 , Page(s): 793 - 799
    Cited by:  Papers (5)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (752 KB)  

    A method of approximating the parasitic poles of active filters employing one, two, or three operational amplifier(s) is presented. These approximations are good for both a single-pole and two-pole model of the operational amplifier and are useful for determining filter stability. The approximation expressions are sufficiently simple that they may be included in the active filter design process. S... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.