Analysis and Decomposition of the Nonlinearities in RF Power Amplifiers

In this paper, the nonlinearity of an RF power amplifier is divided into the static nonlinearity and the dynamic one. A Hammerstein-like nonlinear model is presented accordingly. The dynamic nonlinearity mainly attributes to the memory effect. The memory effect is divided into linear memory effect and the nonlinear one. The linear memory effect can be simulated by a linear filter, and the nonlinear memory effect can be mimicked by a weak nonlinear filter. The decomposition approach of the linear and nonlinear memory effect is proposed to validate the correctness of this new approach. The experimental validation results demonstrate the effectiveness of the proposed concept of the linear memory effect and the nonlinear memory effect.