Investigation on a Desirable DPD Architecture and Trapping Characteristics for GaN Power Amplifier Linearization

A 2-level digital predistortion (DPD), a simplified version of a piecewise DPD, is designed and used to verify that a piecewise DPD is effective in linearizing typical GaN devices in industry that exhibit low power distortions due to trapping. A further investigation is taken to understand the device characteristics that are favored by a piecewise DPD by characterizing various devices.