突破带宽限制：5G宽带Doherty功率放大器设计综述
Breaking Bandwidth Limit: A Review of Broadband Doherty Power Amplifier Design for 5G
摘要：
Doherty功率放大器（DPA）在过去已经被广泛探索，并且已经成为蜂窝基站中最广泛使用的功率放大器（PA）架构之一。经典的DPA受到固有带宽约束，这限制了其在未来5G无线发射机中的应用。在本文中，我们对文献中提出的DPA带宽增强技术进行了全面回顾，以便全面了解DPA用于高效5G无线发射机的宽带设计。我们详细阐述了主要的带宽限制来源，并提供电路设计的见解。然后，我们将概述为DPA开发的带宽增强技术，包括改进的负载调制网络、频率响应优化、寄生补偿、后匹配以及分布式DPA、双输入数字DPA、基于变压器的功率合成PA和无变压器负载调制PA架构。此外，宽带DPA的集成电路（IC）实现的挑战和设计技术进行了讨论，包括在CMOS，SiGe和GAN工艺开发的电路，并在RF和毫米波频率工作的审查。
英文摘要：
The Doherty power amplifier (DPA) has been extensively explored in the past and has become one of the most widely used power amplifier (PA) architectures in cellular base stations. The classical DPA suffers intrinsic bandwidth constrains which limit its application in future 5G wireless transmitters. In this paper, we present a comprehensive review of the DPA bandwidth enhancement techniques proposed in literature in order to provide a thorough understanding of the DPA's broadband design for high-efficiency 5G wireless transmitters. We elaborate on the main bandwidth limitation sources and provide circuit design insights. We then follow with an overview of bandwidth enhancement techniques developed for the DPA, including modified load-modulation networks, frequency response optimization, parasitic compensation, post-matching, as well as distributed DPA, dual-input digital DPA, transformer-based power-combining PA, and transformer-less load modulated PA architectures. Furthermore, challenges and design techniques for integrated circuit (IC) implementation of broadband DPAs are discussed, including a review of circuits developed in CMOS, SiGe, and GaN processes, and operating in RF and mm-Wave frequencies.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
