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A novel quadratic polynomial expansion of nonlinear scattering function for RF power amplifier modeling
Author(s) -
Zheng ZongHua,
Sun LingLing,
Liu Jun,
Zhang Shengzhou,
Su Jiangtao
Publication year - 2017
Publication title -
international journal of numerical modelling: electronic networks, devices and fields
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.249
H-Index - 30
eISSN - 1099-1204
pISSN - 0894-3370
DOI - 10.1002/jnm.2241
Subject(s) - smith chart , amplifier , nonlinear system , load pull , electronic engineering , quadratic function , electrical impedance , component (thermodynamics) , power (physics) , behavioral modeling , quadratic equation , harmonic , computer science , scattering parameters , equivalent circuit , polynomial , control theory (sociology) , engineering , electrical engineering , voltage , mathematics , acoustics , physics , mathematical analysis , impedance matching , cmos , geometry , quantum mechanics , thermodynamics , artificial intelligence , control (management)
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 20 GHz, 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.