Bandwidth Performance Analysis of DLM PAs Including the Class-A/B/J Continuum

Abstract

In this paper, a new method is presented to analyze the bandwidth performance of power amplifiers (PAs) including the Class-A/B/J Continuum for dynamic load modulation (DLM). Due to the introduced biasing operation factor $p$ , the analysis of bandwidth performance of DLM Class-J PAs can be extended to other modes, such as deep Class-AB mode. With the help of MATLAB software, the relationship between the drain efficiency (η) and output power back-off (OPBO) at the current generator plane (CGP) is demonstrated clearly. At the CGP, the proposed method indicates that when $p = 0$ , the fractional bandwidth (FBW) of DLM PAs is improved from 73% to 141% compared with the results at the extrinsic plane (EP). When $p$ is increased to 0.2, the FBW of DLM PAs can be improved from 141% to 156%. Furthermore, the proposed method in this work provides clear guideline to do a general analysis on the bandwidth performance of DLM PAs including the Class-A/B/J Continuum, and it also provides potential theoretical guidance for engineers to design wideband DLM PAs.