A novel quadratic polynomial expansion of nonlinear scattering function for RF power amplifier modeling

作者:Zheng, Zong-Hua; Sun, Ling-Ling*; Liu, Jun; Zhang, Shengzhou; Su, Jiangtao
来源:International Journal of Numerical Modelling: Electronic Networks, Devices and Fields , 2017, 30(6): e2241.
DOI:10.1002/jnm.2241

摘要

The design of high-performance radio frequency power amplifiers requires accurate and simple characterization of power transistors. Behavioral modeling technique provides an efficient and convenient way to tackle this issue. This study presents a novel behavioral model, which is based on quadratic polynomial expansion of nonlinear scattering function with high-order components included. This method was implemented in Computer Aided Design (CAD) program with the help of the frequency-domain defined device component. The comparisons of the output voltage are presented and discussed under different load impedance and input power on a practical circuit operating at 20GHz, and the results show that the model is capable of accurately characterizing the strong nonlinear behavior the device expressed while the fundamental and harmonic frequency load impedance located anywhere inside the Smith Chart.

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