A Broadband Mixed-Signal CMOS Power Amplifier With a Hybrid Class-G Doherty Efficiency Enhancement Technique
A Broadband Mixed-Signal CMOS Power Amplifier With a Hybrid Class-G Doherty Efficiency Enhancement Technique
复制标题
采用混合 G 类 Doherty 效率增强技术的宽带混合信号 CMOS 功率放大器
DOI：
10.1109/jssc.2015.2508023
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发表时间：
2016
影响因子：
5.4
通讯作者：
Hua Wang
中科院分区：
文献类型：
--
作者：
Song Hu;S. Kousai;Hua Wang
本文提出了一种采用混合 G 类 Doherty 架构的宽带混合信号 CMOS 功率放大器 (PA)，可将 PA 效率增强至深度功率回退 (PBO) 区域。我们提出的混合信号线性化技术通过数字 PA 操作确保 PA 的调幅 (AM)-AM 线性度，并通过实时模拟相位补偿抑制 PA 的 AM 相位调制 (PM) 非线性。该 PA 完全集成在标准 65 nm 体 CMOS 工艺中，并在 3.71 GHz 下实现 +26.7 dBm 的峰值输出功率 (Pout ) 和 40.2% 的峰值漏极效率 (DE)。 6 dB 和 12 dB PBO 时的 DE 分别是参考 B 类 PA 操作的 1.8 倍和 2.6 倍，提高了最先进的 CMOS PA PBO 效率性能。通过重新配置 Doherty PA 中主路径和辅助路径之间的相位差，PA 1 dB 带宽从 1.08 GHz 扩展到 1.8 GHz。在使用 1 MSym/s 16 QAM 信号进行的调制测量中，PA 执行动态混合 G 类 Doherty 操作，并在 3.71 GHz 时实现 +20.8 dBm 峰值 Pout，DE 为 28.8%，在 8.1 dB PBO 时效率比 B 类操作提高 2.42 倍。实时 AM-PM 线性化技术使 EVM 和邻道泄漏比 (ACLR) 分别提高了 3.3 和 2.9 dB。宽带 G 类 Doherty 操作还通过调制信号进行了演示。
This paper presents a broadband mixed-signal CMOS power amplifier (PA) with a hybrid Class-G Doherty architecture for PA efficiency enhancement up to the deep power back-off (PBO) region. Our proposed mixed-signal linearization technique ensures the PA's amplitude modulation (AM)-AM linearity by digital PA operation and suppresses the PA's AM-phase modulation (PM) nonlinearity by real-time analog phase compensation. The PA is fully integrated in a standard 65 nm bulk CMOS process, and achieves a peak output power (Pout ) of +26.7 dBm with a 40.2% peak drain efficiency (DE) at 3.71 GHz. The DE at 6 and 12 dB PBO is 1.8× and 2.6× over the reference Class-B PA operation, advancing the state-of-the-art CMOS PA PBO efficiency performance. The PA 1 dB bandwidth is extended from 1.08 to 1.8 GHz by reconfiguring the phase difference between the main and auxiliary paths in the Doherty PA. In the modulation measurements with 1 MSym/s 16 QAM signals, the PA performs dynamic hybrid Class-G Doherty operation and achieves +20.8 dBm peak Pout with 28.8% DE at 3.71 GHz and 2.42× efficiency enhancement at 8.1 dB PBO over Class-B operation. The real-time AM-PM linearization technique achieves 3.3 and 2.9 dB improvements on the EVM and adjacent channel leakage ratio (ACLR), respectively. The broadband Class-G Doherty operation is also demonstrated with modulated signals.