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Circuits and Systems, IEEE Transactions on

Issue 4 • Date April 1983

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Displaying Results 1 - 9 of 9
  • Comment on "A high-quality double integrator building-block for active filters" by M.A. Reddy, et al.

    Publication Year: 1983 , Page(s): 251 - 252
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (236 KB)  

    It has been stated that "existing active-compensated double-integrator units cannot be used in active-ladder filters at high frequencies". It is shown here that the above statement is not true, and also it is suggested that a proposed high-quality circuit will suffer from high-frequency instability. View full abstract»

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  • Correction to 'Switched-Capacitor Building Blocks'

    Publication Year: 1983 , Page(s): 253
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    First Page of the Article
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  • Memory requirements for the hardware implementation of decimators

    Publication Year: 1983 , Page(s): 247 - 248
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (256 KB)  

    The tradeoffs between Memory requirements and Arithmetic Unit speed in the hardware implementation of decimators by FIR digital filters are discussed. View full abstract»

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  • On the PLL spectral purity problem

    Publication Year: 1983 , Page(s): 248 - 251
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (480 KB)  

    It is well known that the spectral purity of a PLL's VCO is degraded by phase detector products. An analytical solution of this problem is given here for the PLL containing an analog multiplier type phase detector with sinusoidal inputs. The theory is applied to a PLL with a proportional plus integral loop filter. The results are compared to those obtained experimentally and by an approximate method that ignores loop dynamics. View full abstract»

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  • Analog multifrequency fault diagnosis

    Publication Year: 1983 , Page(s): 223 - 234
    Cited by:  Papers (32)  |  Patents (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1344 KB)  

    This paper develops the multifrequency fault diagnosis problem in the context of a tableau approach based on the use of the Component Connection Model. This method avoids the computation of the composite system transfer function matrix. The resulting fault diagnosis equations have a regular structure with fixed polynomial order (often quadratic) which is exploited in the solution process. The development includes a test for diagnosability as well as a set of bounds on the number of test frequencies necessary to conduct a diagnosis. An iteration scheme to solve the fault diagnosis equations is proposed and is shown to be locally convergent. A sample diagnosis problem and solution concludes the paper. View full abstract»

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  • Strong structural stability of resistive nonlinear n-ports

    Publication Year: 1983 , Page(s): 197 - 222
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2600 KB)  

    The paper gives several fundamental results on strong structural stability of nonlinear resistive n -ports. A nonlinear resistive n -port consists of n_{R} (coupled) internal resistors and n external ports. Intersection of the internal resistor constitutive relations and the Kirchhoff space is called the configuration space. The projected image of the configuration space onto the port space is called the constitutive relation of the composite n -port. Strong structural stability means qualitative persistence of the constitutive relation of composite n -port under small perturbations of internal resistor constitutive relations. Theorem I asserts that a nonlinear resistive n -port is strongly structurally stable if and only if (i) Kirchhoff space is transversal to the internal resistor constitutive relations, and (ii) the projection map of the configuration space onto port space is a nice immersion. There is, however, an underlying assumption for this fact to be true; there are no port-only loops and no port-only cut sets (Condition P). Theorem 2 says that there are "many" strongly structurally stable n -ports, Theorem 3 gives a strong structural stabilization result via network perturbation, and Theorem 4 and Theorem 5 give results for special class of internal resistor constitutive relations. View full abstract»

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  • Multiple reflection noise on transmission systems with periodic or quasi-periodic impedance disturbances-A frequency- domain approach

    Publication Year: 1983 , Page(s): 242 - 246
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (576 KB)  

    The problem of multiple reflection noise production on a transmission line with periodic or quasi-periodic impedance disturbances has been studied. This work involved a time-domain approach (including a Monte Carlo simulation), which is reported separately, and also a frequency-domain approach which is reported here. It has been found that the latter approach lends itself well to quick and accurate system analysis. The actual system studied was an array telemetry system used in oceanographic situations. However, the results reported here are general and can be applied directly to any digital transmission system having this basic periodic or quasi-periodic impedance disturbance structure. In this paper, the basic frequency-domain theory is presented and prescriptions are given for assessing expected multiple reflection noise contribution for a given system architecture. View full abstract»

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  • Switched-capacitor realization of a discrete Fourier transformer

    Publication Year: 1983 , Page(s): 254 - 255
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (200 KB)  

    Frequency sampling filter approach is described to compute the discrete Fourier transform (DFT). The resulting configuration requires delay elements and differential summers which are shown to be realizable by simple stray-insensitive switched-capacitor (SC) circuits. The proposed scheme finds applications where short data blocks are processed like in radar. View full abstract»

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  • Identification of groups of \epsilon -coherent generators

    Publication Year: 1983 , Page(s): 234 - 241
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (832 KB)  

    It is observed that for a power system after a disturbance certain groups of generators have similar waveforms for their rotor-angle response curves. We define generators to be coherent if the waveforms of the rotor-angle curves are identical. In practice, however, they may be very close but not identical. We say that generators are \epsilon -coherent if the maximum of the difference of their angle curves is less than \epsilon . We present necessary and sufficient conditions for a group of generators to be \epsilon -coherent under a set of disturbances. The condition is expressed in terms of the controllability Grammian of the model. Singular-value decomposition (SVD) of the Grammian is used to provide insights to the results. We also derive an approximate expression for the Grammian and suggest a method for identifying groups of \epsilon -coherent generators. View full abstract»

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