Modeling of Nonlinear Power Amplifier with Memory Effect for Wideband Application

Abstract

This paper is concerned with a new time-domain modeling topology for signals which is applied to wideband power amplifiers. The memory effect will be shown using two-tone intermodulation distortion (IMD) measurement with different tone frequency spacing and power levels. The model is developed by using a memoryless nonlinearity followed by a dynamic LTI system (Hammerstein model) to consider the memory effects associated with wideband signals. For this purpose an Nth-order FIR filter is used. It is shown that the accuracy of wideband signal simulations can be improved by optimizing the model parameters based on time-domain measurements of wideband signals.