Publication of this article in the Journal of Engineering was funded by Portland State University's open access fund.
Journal of Engineering
Radio frequency amplifiers, Power amplifiers, Telecommunication systems -- Simulation methods, Wireless communication systems
This paper proposes an improved estimation approach for modelling RF power amplifiers (PAs) using the Saleh behavioural model. The proposed approach is appropriate for solid-state PA technologies. The 1-dB compression point of the PA is included in the estimation approach to improve the estimation of the Saleh coefficients. Thus, expressions are derived to describe the relationship between the parameters of the Saleh model and the manufacturing specifications of PAs: gain (G), third-order intercept point (IP3) and 1-dB compression point (P1dB). This method is a simple estimation of a memoryless amplitude-to-amplitude (AM/AM) nonlinearity to benefit RF designers evaluating the PA distortion using the PA parameters: P1dB, G, and IP3, before conducting experimental validation. The linearisation method using digital predistortion (DPD) is derived as a function of G, IP3, and P1dB, for mitigating the AM/AM nonlinear distortion. Finally, the modelling and DPD techniques are both evaluated using the experimental results of the GaAs PA.
Al-kanan, H., Yang, X., & Li, F. (2020). Improved estimation for Saleh model and predistortion of power amplifiers using 1-dB compression point. The Journal of Engineering, 2020(1), 13-18.