The Experts below are selected from a list of 106545 Experts worldwide ranked by ideXlab platform

Christophe Gaquiere - One of the best experts on this subject based on the ideXlab platform.

Y. Morandini - One of the best experts on this subject based on the ideXlab platform.

Lotfi Senhadji - One of the best experts on this subject based on the ideXlab platform.

  • Time-Frequency Characterization of interdependencies in nonstationary signals: application to epileptic EEG.
    IEEE Transactions on Biomedical Engineering, 2017
    Co-Authors: Karim Ansari-asl, Fabrice Bartolomei, Jean-jacques Bellanger, Fabrice Wendling, Lotfi Senhadji
    Abstract:

    For the past decades, numerous works have been dedicated to the development of signal processing methods aimed at measuring the degree of association between electroencephalographic (EEG) signals. This interdependency parameter, which may be defined in various ways, is often used to characterize a functional coupling between different brain structures or regions during either normal or pathological processes. In this paper, we focus on the time-Frequency Characterization of the interdependency between signals. Particularly, we propose a novel estimator of the linear relationship between nonstationary signals based on the cross correlation of narrow band filtered signals. This estimator is compared to a more classical estimator based on the coherence function. In a simulation framework, results show that it may exhibit better statistical performances (bias and variance or mean square error) when a priori knowledge about time delay between signals is available. On real data (intracerebral EEG signals), results show that this estimator may also enhance the readability of the time-Frequency representation of relationship and, thus, can improve the interpretation of nonstationary interdependencies in EEG signals. Finally, we illustrate the importance of characterizing the relationship in both time and Frequency domains by comparing with Frequency-independent methods (linear and nonlinear).

B K Gilbert - One of the best experts on this subject based on the ideXlab platform.

  • high Frequency Characterization of power ground plane structures
    IEEE Transactions on Microwave Theory and Techniques, 1999
    Co-Authors: Robert W Techentin, B K Gilbert
    Abstract:

    In this paper, we describe a strategy to characterize power and ground-plane structures using a full cavity-mode Frequency-domain resonator model. We develop insights into modal analysis and introduce a novel technique to suppress modal impedances, minimizing both transfer and input impedances. The influence of port locations on the Z matrix is evaluated.

  • High-Frequency Characterization of power/ground-plane structures
    IEEE Transactions on Microwave Theory and Techniques, 1999
    Co-Authors: Guang-tsai Lei, Robert W Techentin, B K Gilbert
    Abstract:

    In this paper, we describe a strategy to characterize power and ground-plane structures using a full cavity-mode Frequency-domain resonator model. We develop insights into modal analysis and introduce a novel technique to suppress modal impedances, minimizing both transfer and input impedances. The influence of port locations on the Z matrix is evaluated.

Linda C. Smith - One of the best experts on this subject based on the ideXlab platform.

  • High Frequency Characterization of small geometry bipolar transistors
    Proceedings of the 1988 Bipolar Circuits and Technology Meeting, 1
    Co-Authors: Paul J. Van Wijnen, Linda C. Smith
    Abstract:

    Small-signal high-Frequency measurements of small bipolar transistors, carried out 'on wafer' up to a Frequency of 18 GHz, are presented. Current gain, transconductance, and maximum power gain characteristics as a function of Frequency and DC bias conditions have been obtained with accurate calibration and correction techniques. The figures of merit, f/sub t/f/sub y/, and f/sub max/, associated with these characteristics have been discussed, and a simplified analysis of the relevant time constants has been given. Simulation results with a modified Gummel/Poon model show that good high-Frequency modeling can be achieved by taking into account the current dependence of the base resistance and the base transit time, and the modeling of excess phase shift. Finally the importance of modeling the distributed base-collector capacitance, which is accomplished in the Gummel/Poon model with the parameter x/sub cjc/, has been emphasized. It is very important even for frequencies well below the cutoff Frequency. >