scholarly journals Conflict Set and Waveform Modelling for Power Amplifier Design

2015 ◽  
Vol 2015 ◽  
pp. 1-29 ◽  
Author(s):  
Anamarija Juhas ◽  
Ladislav A. Novak
Keyword(s):  
Closed Form ◽  
Case Studies ◽  
Power Amplifier ◽  
Global Minima ◽  
Maximal Amplitude ◽  
Keen Interest ◽  
Waveform Modelling ◽  
Amplifier Design ◽  
Dc Component ◽  
Optimal Waveforms

Various classes of nonnegative waveforms containing dc component, fundamental andkthharmonick≥2, which proved to be of interest in waveform modelling for power amplifier (PA) design, are considered in this paper. In optimization of PA efficiency, nonnegative waveforms with maximal amplitude of fundamental harmonic and those with maximal coefficient of cosine term of fundamental harmonic (optimal waveforms) play an important role. Optimal waveforms have multiple global minima and this fact closely relates the problem of optimization of PA efficiency to the concept of conflict set. There is also keen interest in finding descriptions for various classes of suboptimal waveforms, such as nonnegative waveforms with at least one zero, nonnegative waveforms with maximal amplitude of fundamental harmonic for prescribed amplitude ofkthharmonic, nonnegative waveforms with maximal coefficient of cosine part of fundamental harmonic for prescribed coefficients ofkthharmonic, and nonnegative cosine waveforms with at least one zero. Closed form descriptions for all these suboptimal types of waveforms are provided in this paper. Suboptimal waveforms may also have multiple global minima and therefore be related to the concept of conflict set. Four case studies of usage of closed form descriptions of nonnegative waveforms in PA modelling are also provided.

scholarly journals General Description of Nonnegative Waveforms up to Second Harmonic for Power Amplifier Modelling

2014 ◽  
Vol 2014 ◽  
pp. 1-18 ◽  
Author(s):  
Anamarija Juhas ◽  
Ladislav A. Novak
Keyword(s):  
Case Studies ◽  
Power Amplifier ◽  
Second Harmonic ◽  
Practical Interest ◽  
General Description ◽  
Maximal Amplitude ◽  
The Third

General description of nonnegative waveforms up to second harmonic in terms of independent (unconstrained) parameters is provided. Three important subclasses of the class of nonnegative waveforms are also fully characterised: nonnegative waveforms with maximal amplitude of fundamental harmonic for prescribed amplitude of second harmonic, nonnegative waveforms with maximal coefficient of cosine part of fundamental harmonic for prescribed coefficients of second harmonic, and nonnegative waveforms with at least one zero. We prove that members of the first two subclasses have at least one zero; that is, they also belong to the third subclass. Nonnegative cosine waveforms up to second harmonic are also considered and characterised. A number of case studies of practical interest for power amplifier (PA) design, involving nonnegative waveforms up to second harmonic, are also considered.

Practical Considerations for the CW Power Amplifier Design for Lower Hybrid Frequency Applications

2020 ◽  
Author(s):  
Sandeep R. Sainkar ◽  
Alice N. Cheeran ◽  
Gajendrakumar Shinde ◽  
Promod K. Sharma ◽  
Harish V. Dixit
Keyword(s):  
Power Amplifier ◽  
Lower Hybrid ◽  
Hybrid Frequency ◽  
Amplifier Design

scholarly journals Improvement of Small Signal Equivalent Simulations for Power and Efficiency Matching of GaN HEMTs

Electronics ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 263
Author(s):  
Roberto Quaglia
Keyword(s):  
Power Amplifier ◽  
High Electron Mobility Transistor ◽  
High Electron ◽  
Large Signal ◽  
Signal Model ◽  
Or Efficiency ◽  
Summary Table ◽  
Matching Networks ◽  
Amplifier Design ◽  
Frequency Power

In high-frequency power-amplifier design, it is common practice to approach the design of reactive matching networks using linear simulators and targeting a reflection loss limit (referenced to the target impedance). It is well known that this is only a first-pass design technique, since output power or efficiency contours do not correspond to mismatch circles. This paper presents a method to improve the accuracy of this approach in the case of matching network design for power amplifiers based on gallium nitride (GaN) technology. Equivalent mismatch circles, which lay within the power or efficiency contours targeted by the design, are analytically obtained thanks to geometrical considerations. A summary table providing the parameters to use for typical contours is provided. The technique is demonstrated on two examples of power-amplifier design on the 6–12 GHz band using the non-linear large-signal model of a GaN High Electron Mobility Transistor (HEMT).

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