A 24-to-30GHz Double-Quadrature Direct-Upconversion Transmitter with Mutual-Coupling-Resilient Series-Doherty Balanced PA for 5G MIMO Arrays

📋 论文概要

提出一种24-30GHz双正交直接上变频发射机，采用串联Doherty平衡功率放大器架构，解决了相控阵天线互耦导致的负载变化问题，同时满足5G高峰均比信号的效率要求。

💡 主要创新点

• 创新点1：双正交直接上变频架构，实现宽带正交调制并降低镜像抑制对失配的敏感度
• 创新点2：串联Doherty平衡PA，在互耦导致的宽范围负载变化下仍能保持高效率和线性度
• 创新点3：片上集成互耦补偿机制，无需外部隔离器即可提升阵列鲁棒性

🏷 关键词

📄 原文摘要

The performance and robustness of millimeter-wave (mm-wave) phased-array transmitters (TXs) define, to a large extent, the quality of a high-data-rate 5G link. In practical situations, however, this TX performance is strongly affected by mutual coupling among the closely-spaced radiating elements in the phased-array antenna, yielding a beam-steering angle-dependent and time-varying loading or VSWR condition. Furthermore, 5G mm-wave systems typically employ spectrally efficient modulation schemes with high peak-to-average power ratios (PAPRs). This requirement demands the TX power amplifier (PA) to operate in power back-off (PBO), thus degrading its average efficiency. To alleviate this issue, outphasing or Doherty PAs (DPAs) can be adopted [1-4]. However, as depicted in Fig. 14.4.1 (Top left), these efficiencyenhancement techniques will worsen the output reflection coefficient of the PA (ΓPA).

👥 作者与机构

Masoud Pashaeifar, Leo C. N. de Vreede, Morteza S. Alavi

Delft University of Technology, Delft, The Netherlands