High-Frequency Behavior of Graphene-Based Interconnects—Part II: Impedance Analysis and Implications for Inductor Design

2011 ◽  
Vol 58 (3) ◽  
pp. 853-859 ◽  
Author(s):  
Deblina Sarkar ◽  
Chuan Xu ◽  
Hong Li ◽  
Kaustav Banerjee
Keyword(s):  
High Frequency ◽  
Impedance Analysis ◽  
Frequency Behavior

scholarly journals Aging monitoring of electrical machines using winding high frequency equivalent circuits

Open Physics ◽  
2019 ◽  
Vol 17 (1) ◽  
pp. 670-677
Author(s):  
Sonia Ait-Amar ◽  
Daniel Roger ◽  
Serghei Savin
Keyword(s):  
Equivalent Circuit ◽  
High Frequency ◽  
Impedance Analysis ◽  
Electrical Machines ◽  
Monitoring Method ◽  
Insulation Aging ◽  
Capacitance Variation ◽  
Resonance Frequencies ◽  
Predetermined Level ◽  
Frequency Behavior

Abstract This study defines a monitoring method based on impedance analysis in the upper part of the spectrum. It focuses on the analysis of the high frequency behavior of electrical machines windings considering the turn-to-turn capacitance variations (delta-C) due to insulation aging. An equivalent circuit is automatically generated from the turn arrangements in coils; parameters are computed considering the coil shape and the characteristics of insulation materials. PSpice analysis of the equivalent circuit yields the resonance frequencies to be monitored. With this software and a database giving the relationship between the turn-to-turn capacitance variation delta-C and the reduction of insulation performances due to aging, it is possible to build a monitoring system able to produce an alert when the probability of failure becomes higher than a predetermined level.

scholarly journals Sub-THz and THz SiGe HBT Electrical Compact Modeling

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1397
Author(s):  
Bishwadeep Saha ◽  
Sebastien Fregonese ◽  
Anjan Chakravorty ◽  
Soumya Ranjan Panda ◽  
Thomas Zimmer
Keyword(s):  
Heterojunction Bipolar Transistors ◽  
Silicon Germanium ◽  
High Frequency ◽  
State Of The Art ◽  
Sensitivity Study ◽  
Compact Modeling ◽  
Process Technology ◽  
Very High Frequency ◽  
Sige Hbt ◽  
Frequency Behavior

From the perspectives of characterized data, calibrated TCAD simulations and compact modeling, we present a deeper investigation of the very high frequency behavior of state-of-the-art sub-THz silicon germanium heterojunction bipolar transistors (SiGe HBTs) fabricated with 55-nm BiCMOS process technology from STMicroelectronics. The TCAD simulation platform is appropriately calibrated with the measurements in order to aid the extraction of a few selected high-frequency (HF) parameters of the state-of-the-art compact model HICUM, which are otherwise difficult to extract from traditionally prepared test-structures. Physics-based strategies of extracting the HF parameters are elaborately presented followed by a sensitivity study to see the effects of the variations of HF parameters on certain frequency-dependent characteristics until 500 GHz. Finally, the deployed HICUM model is evaluated against the measured s-parameters of the investigated SiGe HBT until 500 GHz.

Magnetic Permeability and Relaxation Frequency in High Frequency Magnetic Materials.

2001 ◽  
Vol 674 ◽  
Author(s):  
M.I. Rosales ◽  
H. Montiel ◽  
R. Valenzuela
Keyword(s):  
High Frequency ◽  
Domain Walls ◽  
Magnetocrystalline Anisotropy ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Anisotropy Constant ◽  
Relaxation Frequency ◽  
Resonance Relaxation ◽  
Frequency Behavior

ABSTRACTAn investigation of the frequency behavior of polycrystalline ferrites is presented. It is shown that the low frequency dispersion (f < 10 MHz) of permeability is associated with the bulging of pinned domain walls, and has a mixed resonance-relaxation character, closer to the latter. It is also shown that there is a linear relationship between the magnetocrystalline anisotropy constant, K1, and the relaxation frequency. The slope of this correlation depends on the grain size. Such a relationship could allow the determination of this basic parameter from polycrystalline samples.

High-Frequency Behavior Models of AC Motors

2009 ◽  
Vol 45 (1) ◽  
pp. 133-138 ◽  
Author(s):  
N. Idir ◽  
Y. Weens ◽  
M. Moreau ◽  
J. J. Franchaud
Keyword(s):  
High Frequency ◽  
Ac Motors ◽  
Frequency Behavior ◽  
Behavior Models

The High Frequency Behavior of a Plasma

1931 ◽  
Vol 37 (11) ◽  
pp. 1458-1483 ◽  
Author(s):  
Lewi Tonks
Keyword(s):  
High Frequency ◽  
Frequency Behavior

scholarly journals From frequency dispersion to ohmic impedance: A new insight on the high-frequency impedance analysis of electrochemical systems

2019 ◽  
Vol 320 ◽  
pp. 134609 ◽  
Author(s):  
Oumaïma Gharbi ◽  
Arthur Dizon ◽  
Mark E. Orazem ◽  
Mai T.T. Tran ◽  
Bernard Tribollet ◽  
...  
Keyword(s):  
High Frequency ◽  
Frequency Dispersion ◽  
Impedance Analysis ◽  
Electrochemical Systems
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