The next generation wireless network, 5G, is expected to provide ubiquitous connections to billions of devices as well as to unlock many new services through multigigabit-per-second data transmission. To meet the ever-increasing demands for higher data rates and larger capacities, new modulation schemes have been developed, and wider frequency bands, such as those at millimeter wave (mm-wave), have been designated for 5G [1], [2]. Massive multiple input/multiple output (MIMO), which uses a large number of antennas at the transmitter and receiver, has been considered one of the key 5G technologies to improve data throughput and spectrum efficiency [3]. These new application scenarios impose stringent requirements on wireless transceiver front ends and call for special considerations at the circuit and system design levels. In the transmitter, power amplifiers (PAs) should accommodate complex modulated signals, featuring a high peak-to-average-power ratio (PAPR) and a wide modulation bandwidth. Moreover, in massive MIMO arrays, PAs should maintain a high average efficiency to mitigate thermal heating issues.

中文翻译：

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打破带宽限制：5G 宽带 Doherty 功率放大器设计回顾

下一代无线网络 5G 有望为数十亿设备提供无处不在的连接，并通过每秒数千兆位的数据传输解锁许多新服务。为了满足对更高数据速率和更大容量不断增长的需求，已经开发了新的调制方案，并且已经为 5G 指定了更宽的频段，例如毫米波 (mm-wave) [1]、[2 ]。大规模多输入/多输出 (MIMO) 在发射器和接收器处使用大量天线，已被认为是提高数据吞吐量和频谱效率的关键 5G 技术之一 [3]。这些新的应用场景对无线收发器前端提出了严格的要求，并要求在电路和系统设计级别进行特殊考虑。在发射器中，功率放大器 (PA) 应适应复杂的调制信号，具有高峰均功率比 (PAPR) 和宽调制带宽。此外，在大规模 MIMO 阵列中，PA 应保持较高的平均效率以减轻热发热问题。