Satisfying the increasing volume of data streaming in modern wireless systems will demand energy-efficient RF front ends with gigabit data rates, high integration levels, and low cost. The power amplifier (PA) is the last door in the RF front end for both the digital and analog kingdoms, one that greatly affects the quality of service of the wireless link [1]. Thus, breaking through barriers (i.e., output power, linearity, efficiency, operation band, and even multifunction) in PA design is of paramount importance right now [2]. Consequently, with the aim of meeting the modern requirements of multistandard wireless applications, such as 5G, narrowband Internet of Things (NB-IoT), wireless local area network (WLAN), and future smart communications, various mixed-signal PAs have been developed and proposed in recent years.

中文翻译：

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增强多功能性：数字功率放大器，模拟和数字王国的最后一个射频前沿

满足现代无线系统中不断增长的数据流将需要具有千兆数据速率、高集成度和低成本的节能射频前端。功率放大器 (PA) 是数字和模拟领域 RF 前端的最后一道门，它极大地影响了无线链路的服务质量 [1]。因此，突破 PA 设计中的障碍（即输出功率、线性度、效率、工作频带，甚至多功能）是目前最重要的 [2]。因此，为了满足 5G、窄带物联网 (NB-IoT)、无线局域网 (WLAN) 和未来智能通信等多标准无线应用的现代需求，开发了各种混合信号 PA并在近几年提出。