GaN HEMT large-signal model accounting for both low-frequency dispersion and high-frequency non-quasi-static effects

2011 ◽  
Author(s):  
G. Crupi ◽  
A. Raffo ◽  
D. M. M. Schreurs ◽  
G. Avolio ◽  
V. Vadala ◽  
...  
Keyword(s):  
High Frequency ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Large Signal ◽  
Signal Model ◽  
Gan Hemt

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.

A Stochastic Large-Signal Model for Printed High-Frequency Rectifiers Used for Efficient Generation of Higher Harmonics

2020 ◽  
Vol 68 (6) ◽  
pp. 2151-2160
Author(s):  
Kevin Neumann ◽  
Laura Kuhnel ◽  
Fabian Langer ◽  
Andreas Rennings ◽  
Niels Benson ◽  
...  
Keyword(s):  
High Frequency ◽  
Large Signal ◽  
Signal Model ◽  
Higher Harmonics ◽  
Efficient Generation

Characterization of GaN HEMT Low-Frequency Dispersion Through a Multiharmonic Measurement System

2010 ◽  
Vol 58 (9) ◽  
pp. 2490-2496 ◽  
Author(s):  
Antonio Raffo ◽  
Sergio Di Falco ◽  
Valeria Vadala ◽  
Giorgio Vannini
Keyword(s):  
Measurement System ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Gan Hemt

Drain current transient and low-frequency dispersion characterizations in AlGaN/GaN HEMTs

2016 ◽  
Vol 8 (4-5) ◽  
pp. 663-672 ◽  
Author(s):  
Agostino Benvegnù ◽  
Davide Bisi ◽  
Sylvain Laurent ◽  
Matteo Meneghini ◽  
Gaudenzio Meneghesso ◽  
...  
Keyword(s):  
Deep Level ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Drain Current ◽  
High Electron Mobility Transistors ◽  
Current Transient ◽  
High Electron ◽  
Large Signal ◽  
Class Ab ◽  
Electron Mobility Transistors

This paper presents a detailed trap investigation based on combined pulsed I/V measurements, drain current transient (DCT) measurements and low-frequency dispersion measurements of transconductance (LF Y21) and output conductance (LF Y22). DCT characterization is carried out over a 7-decade time scale. LF Y21and Y22measurements are carried out over the frequency range from 100 Hz to 1 GHz. These combined measurements were performed at several temperatures for AlGaN/GaN high electron mobility transistors under class AB bias condition and allowed the extraction of the activation energy (Ea) and the capture cross section (σc) of the identified traps. Extensive measurements of these characteristics as a function of device bias are reported in this work to understand the dynamic trap behavior. This paper demonstrated a correlation between LF small-signal (LF Y21and Y22) and large-signal voltage steps (DCT) results. These measurements allow identifying the same 0.64 eV deep level, attributed to a native defect of GaN, possibly located in the buffer layer.

The dielectric properties of aqueous nucleic acid solutions

1966 ◽  
Vol 291 (1426) ◽  
pp. 368-388 ◽  
Keyword(s):  
Dielectric Properties ◽  
High Frequency ◽  
Deoxyribonucleic Acid ◽  
General Pattern ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Theoretical Interpretation ◽  
Acid Solutions ◽  
Dispersion Region ◽  
Ionic Polarization

The dielectric properties of aqueous solutions of the sodium salts of ribonucleic acid and deoxyribonucleic acid have been determined. The general pattern of behaviour observed for other aqueous polyelectrolyte systems has been verified in these studies. There are indications that a low frequency dispersion region (below 2 Mc/s) is present as well as the normal high frequency dispersion region. The theoretical interpretation of the experimental results makes use of the O’Konski theory of ionic polarization and the formulation of an equilibrium between counterions ‘non-specifically bound’ and ‘free’ from the electrostatic field of the polyion. Calculations are made on the basis of this theory and estimates of the values of the specific conductivities existing at the polyion surface are made.

Research of PFC Based on Boost Converter

2014 ◽  
Vol 556-562 ◽  
pp. 2063-2066
Author(s):  
Xiao Long Tan ◽  
Jia Zhou ◽  
Wen Bin Wang
Keyword(s):  
Power Factor ◽  
Low Frequency ◽  
Constant Load ◽  
Current Control ◽  
Voltage Regulator ◽  
Large Signal ◽  
Signal Model ◽  
High Power Factor ◽  
Wide Range ◽  
Average Current

Principles of traditional Boost PFC circuit are introduced. Based on average current control, a large signal model is obtained and turned into small signal model carrying constant load. And current regulator and voltage regulator are designed accordingly. Directing at strong non-linear characteristics of the circuit, this paper adopts double average method to analyze its low frequency stability. This converter can achieve high power factor in wide range of input and load power and simulation result shows that power factor is above 0.99.

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