A high efficiency multi-mode class-E outphasing RF power amplifier (PA) with a passive combining circuit is presented. The multi-mode PA combines multiple class-E amplifier branches and can work in different configurations. The PA improves efficiency at lower power levels by switching ‘on’ and ‘off’ individual branches in a static or dynamic manner and using Efficiency Enhancement Circuit (EEC). The proposed power amplifier is designed in 45nm CMOS technology. The PA delivers 31.6 dBm peak output power at 2.4 GHz with 49.2% drain efficiency in high power single level mode. With 64-QAM long-term evolution (LTE) signal with 10 MHz and 20 MHz bandwidth, −57 dBc and −53 dBc adjacent channel power ratio (ACPR) are obtained in single level outphasing (SLO) mode after digital pre-distortion (DPD). 25% and 33% average drain efficiency are achieved with LTE signal with 6 dB peak-to-average power ratio (PAPR) in single level outphasing and asymmetric multilevel outphasing (AMO) mode, respectively. The PA satisfies the spectral mask requirement of 802.11g WLAN signal with high margin. Error vector magnitude (EVM) of 1.1% (−39.36 dB) is obtained from the PA in single level outphasing high power mode after DPD with 64-QAM LTE signal with 10 MHz bandwidth.

中文翻译：

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采用 45nm CMOS 工艺具有 31.6 dBm 峰值输出功率的高效多模式异相射频功率放大器

提出了一种具有无源组合电路的高效多模 E 类异相射频功率放大器 (PA)。多模 PA 结合了多个 E 类放大器分支，可以在不同的配置下工作。PA 通过以静态或动态方式“开启”和“关闭”各个分支并使用效率增强电路 (EEC) 来提高较低功率水平下的效率。建议的功率放大器采用 45nm CMOS 技术设计。PA 在 2.4 GHz 时提供 31.6 dBm 峰值输出功率，在高功率单电平模式下具有 49.2% 的漏极效率。对于具有 10 MHz 和 20 MHz 带宽的 64-QAM 长期演进 (LTE) 信号，数字预失真后在单电平异相 (SLO) 模式下获得 −57 dBc 和 −53 dBc 邻道功率比 (ACPR) ( DPD）。LTE 信号在单电平异相和非对称多电平异相 (AMO) 模式下分别实现了 25% 和 33% 的平均漏极效率，峰均功率比 (PAPR) 为 6 dB。PA以高裕度满足802.11g WLAN信号的频谱屏蔽要求。1.1% (-39.36 dB) 的误差矢量幅度 (EVM) 在单电平异相高功率模式下在使用 64-QAM LTE 信号和 10 MHz 带宽的 DPD 后从 PA 获得。