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IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications

Issue 1 • Jan 2000

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Displaying Results 1 - 14 of 14
  • Surface charges and fields in a resistive coaxial cable carrying a constant current

    Publication Year: 2000, Page(s):63 - 66
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    We calculate the surface charges, potentials, and fields in a long cylindrical coaxial cable with inner and outer conductors of finite conductivities and finite areas carrying a constant current. It is shown that there is an electric field outside the return conductor View full abstract»

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  • Information transmission using chaotic discrete-time filter

    Publication Year: 2000, Page(s):82 - 88
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    In this work an adaptive approach for transmitting information hidden in a chaotic carrier is presented. The proposed method uses as a chaotic generator a discrete time nonlinear filter with a sawtooth nonlinearity induced by the two's complement overflow in digital filters. The synchronization at the receiving end is ensured by an adaptive slave system. Two different methods for hiding the inform... View full abstract»

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  • On the use of a priori knowledge in adaptive inverse control

    Publication Year: 2000, Page(s):54 - 62
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    In adaptive inverse control the coefficients of the controller are adaptively adjusted by an algorithm which is controlled by the input and the error signal. Using a priori knowledge about the plant, the controller can be split into a long fixed and a short adaptive filter. The controller can be made more efficient by feeding back the error signal only in a desired frequency range. A modified obje... View full abstract»

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  • Nonlinear output stabilization control for multimachine power systems

    Publication Year: 2000, Page(s):46 - 53
    Cited by:  Papers (54)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    In this paper, a robust decentralized nonlinear control scheme is proposed for multimachine power system stability enhancement. The nonlinear controller consists of a novel dynamic direct feedback linearization (DFL) compensator through the excitation loop to cancel the nonlinearities and interactions among generators and a robust feedback controller to guarantee the asymptotic stability of the DF... View full abstract»

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  • Improved implementation of Chua's chaotic oscillator using current feedback op amp

    Publication Year: 2000, Page(s):76 - 79
    Cited by:  Papers (61)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    An improved implementation of Chua's chaotic oscillator is proposed. The new realization combines attractive features of the current feedback op amp (CFOA) operating in both voltage and current modes to construct the active three-segment voltage-controlled nonlinear resistor. Several enhancements are achieved: the component count is reduced and the chaotic spectrum is extended to higher frequencie... View full abstract»

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  • Isolated three-phase rectifier unit with high power factor

    Publication Year: 2000, Page(s):89 - 96
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    This paper presents the analysis of an isolated three-phase converter operating in soft commutation as a battery charger. The structure works with a high power factor without intermediate circuits. Its main features are: simplicity of control, driver circuit, and robustness of power circuits, Principles of operation, design procedure, simulation and experimental results obtained from a laboratory ... View full abstract»

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  • A new floating controlled resistance operating in class AB

    Publication Year: 2000, Page(s):67 - 72
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    A new implementation for a floating controlled resistance operating in class AB is introduced. This uses a new translinear mixed loop of eight bipolar transistors. The circuit has been biased with DC current in such a way that it works effectively in class AB. A new building block, the third-generation controlled current conveyor (CCCIII) is then implemented. This has been obtained simply by addin... View full abstract»

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  • Group delay and group delay sensitivity of periodically switched linear networks

    Publication Year: 2000, Page(s):96 - 104
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    This paper presents a method for the computation of group delay and group delay sensitivity of periodically switched networks containing all types of linear elements. The method is accurate because no approximation is made, and efficient because some parts of the computations are performed only once, in a preprocessing step before simulation starts. The method can be used for analysis of switched-... View full abstract»

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  • Time-delay polynomial networks and quality of approximation

    Publication Year: 2000, Page(s):40 - 45
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    We consider a large family of finite memory causal time-invariant maps G from an input set S to a set of R-valued functions, with the members of both sets of functions defined on the nonnegative integers. We markedly improve recent results by giving an explicit upper bound on the error in approximating a G using a two-stage structure consisting of a tapped delay line and a static polynomi... View full abstract»

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  • A low-voltage CMOS OTA with rail-to-rail differential input range

    Publication Year: 2000, Page(s):1 - 8
    Cited by:  Papers (10)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    This paper describes a novel circuit design technique for a low-voltage CMOS operational transconductance amplifier (OTA) where the output current versus the input voltage relationship is linear for differential input voltage range extended from rail to rail. The input transconducting CMOS transistors operate in the nonsaturation region. A pair of complementary n-type input OTAN and p-type OTAP ci... View full abstract»

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  • Frequency-band complex noninteger differentiator: characterization and synthesis

    Publication Year: 2000, Page(s):25 - 39
    Cited by:  Papers (405)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The state-of-the-art on generalized (or any order) derivatives in physics and engineering sciences, is outlined for justifying the interest of the noninteger differentiation. The problems subsequent to its use in real-time operations are then set out so as to motivate the idea of synthesizing it by a recursive distribution of zeros and poles. An analysis of the existing work is also proposed to su... View full abstract»

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  • DC-AC power inversion using Σ-Δ modulation

    Publication Year: 2000, Page(s):79 - 82
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (92 KB)

    A feasibility study of Σ-Δ modulation as a control mechanism for low-frequency DC-AC power inverters with sinusoidal output voltage is presented. The sinusoidal DC-AC inverter, composed of a Σ-Δ 1-bit A/D converter and a half-bridge inverter, was built and tested. Measured Bode plots of the closed-loop response are given and the output voltage waveform observed at 50 Hz is ... View full abstract»

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  • An analysis of CNN settling time

    Publication Year: 2000, Page(s):9 - 24
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    In this paper, the settling time of cellular neural networks (CNN's) is defined and investigated. The settling time is crucial for both simulation and applications of VLSI CNN chips. The computational effort for the numerical integration may be drastically reduced, and CNN programs can be optimized, if a priori knowledge on the settling time is available. For the class of uncoupled CNN's, we prese... View full abstract»

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  • New active decoupling technique extends lower bandwidth limit for HBT-based MMIC amplifiers

    Publication Year: 2000, Page(s):72 - 75
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (124 KB)

    A new circuit technique is presented to achieve extended low-frequency operation for integrated circuit amplifier stages in which the maximum value of decoupling capacitor is restricted by processing technology limitations. Details are provided of a wideband heterojunction bipolar transistor (HBT) 50 Ω output buffer stage for a photo preamplifier which embodies this new active decoupling tec... View full abstract»

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