Comparison of the Behavioral Modelings for RF Power Amplifier With Memory Effects

In this letter, three different kinds behavioral models are introduced to analyze the performance of power amplifiers (PAs) with strong memory. Among these models, the non-uniform delay memory polynomial model is compared with the traditional memory polynomial model for analyzing effect of sparse delays, and the enhanced memory polynomial model for evaluating nonlinear memory effect. Finally, a WiMAX Doherty-structure LDMOS PA is measured and three models are extracted from measured output of the PA. The result proves that the model complexity can be greatly reduced with non-uniform delays and the model precision improved with nonlinear memory model.