Published In

Electronics

Document Type

Article

Publication Date

10-31-2020

Subjects

Power amplifiers -- Design and construction, Solid state electronics, Radio -- Transmitter-receivers -- Simulation methods, Signal processing

Abstract

The Saleh behavioral model exhibits high prediction accuracy for nonlinearity of traveling-wave tube power amplifiers (TWT-PAs). However, the accuracy of the Saleh model degrades when modeling solid-state power amplifiers (SSPAs) technology. In addition, the polynomial expansion of the Saleh model consists of only odd-order terms as analyzed in this work. This paper proposes a novel model accuracy enhancement for the Saleh amplitude-to-amplitude (AM/AM) model when applied to radio frequency (RF) SSPAs. The proposed model enhancement accounts for the second-order intermodulation distortion, which is an important nonlinearity challenge in wideband wireless communications. The proposed static AM/AM model is a three-parameter rational function, which exhibits low complexity compared to the state-of-the-art behavioral models. A transpose architecture of finite-impulse digital filter is used to quantify the memory effect in SSPAs. A least-squares method is used for extracting all the model parameters. A linearization technique using a three-parameter digital predistortion model is also calculated to compensate for the AM/AM nonlinear distortion in SSPAs. Finally, the identification and evaluation of the enhanced Saleh model is presented based on measurements of RF SSPAs.

Rights

© 2020 by the authors. Licensee MDPI, Basel, Switzerland.

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.

DOI

10.3390/electronics9111806

Persistent Identifier

https://archives.pdx.edu/ds/psu/34395

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