Behavioral Modeling of High Power Amplifiers Based on Measured Two-tone Transfer Characteristics

摘要

Multi-stage high power amplifiers generally have a large memory effect and high nonlinearity. The usual AM-AM and AM-PM measurement data cannot describe the large distortion characteristics in the presence of the systems large memory. A more accurate amplifier behavioral modeling method based on two-tone transfer characteristics is presented and the measurement setup for these characteristics is described. The measured data are modeled using the conventional AM-AM and AM-PM model to fit the measured amplitudes and phases of the fundamental, third-order intermodulation (IM3) and fifth-order intermodulation (IM5) components. This is a quasi-memoryless model. However, it provides a better description of memory effects and an accurate presentation of highly nonlinear characteristics than the same quasi-memoryless model based on the single-tone transfer characteristics.