This article presents a broadband power amplifier (PA) with a distributed-balun output network that provides the PA optimum load impedance over a wide bandwidth. The proposed output network comprises two coupled-line sections and absorbs the device output capacitance. It employs a scalable coupled-line modeling approach that captures both the magnetic (inductive) and electric (capacitive) couplings between windings with fewer parameters and supports a rapid design process. Closed-form design solutions, design space limitations, bandwidth limits, and design tradeoffs are derived and analyzed comprehensively. Its extension to differential output and common-mode response is also discussed in detail. As a proof of concept, a prototype PA is implemented for multiband fifth-generation (5G) applications in 45-nm SOI CMOS. With no biasing retuning or network reconfiguration, the PA consistently achieves >19.1 dBm $P_{\mathrm {sat}}$ , >37.3% peak power-added efficiency (PAE), 17.8–19.6 dBm $P_{\mathrm {1dB}}$ , and 36.6%–44.3% PAE $_{P\mathrm {1dB}}$ over 24–40 GHz, verifying the truly wideband large-signal matching. The PA demonstrates 5G new radio (NR) frequency range 2 (FR2) modulation signals over 24–42 GHz, covering n257/n258/n260 5G bands. For 5G NR FR2 800-MHz 2-CC 64-QAM signals (11.78-dB PAPR), the PA achieves 11.3-dBm/16.6% average $P_{\mathrm {out}}$ /PAE with −25.1-dB rms EVM at 28-GHz and 10.2-dBm/13.6% average $P_{\mathrm {out}}$ /PAE with −25.1-dB rms EVM at 37 GHz.

中文翻译：

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具有分布式巴伦输出网络的宽带线性超紧凑型毫米波功率放大器：分析与设计

本文介绍了一种具有分布式巴伦输出网络的宽带功率放大器 (PA)，可在宽带宽内提供 PA 最佳负载阻抗。建议的输出网络包括两个耦合线部分并吸收设备输出电容。它采用可扩展的耦合线建模方法，以较少的参数捕获绕组之间的磁（电感）和电（电容）耦合，并支持快速设计过程。全面推导出和分析封闭形式的设计解决方案、设计空间限制、带宽限制和设计权衡。还将详细讨论其对差分输出和共模响应的扩展。作为概念验证，我们在 45 纳米 SOI CMOS 中为多频段第五代 (5G) 应用实施了原型 PA。 $P_{\mathrm {sat}}$ , >37.3% 峰值功率附加效率 (PAE)，17.8–19.6 dBm $P_{\mathrm {1dB}}$ , 和 36.6%–44.3% PAE $_{P\mathrm {1dB}}$ 超过 24–40 GHz，验证真正的宽带大信号匹配。PA 演示了 24–42 GHz 上的 5G 新无线电 (NR) 频率范围 2 (FR2) 调制信号，涵盖了 n257/n258/n260 5G 频段。对于 5G NR FR2 800-MHz 2-CC 64-QAM 信号 (11.78-dB PAPR)，PA 平均达到 11.3-dBm/16.6% $P_{\mathrm {out}}$ /PAE 具有 -25.1-dB rms EVM 在 28-GHz 和 10.2-dBm/13.6% 平均值 $P_{\mathrm {out}}$ /PAE，在 37 GHz 时具有 −25.1-dB rms EVM。