新型异相宽带功率放大与合成电路关键技术研究

Project research is a combination of innovative research and solving the key technical problems. A broadband outphasing power amplification and combine circuits used in 5G communication system is provided based on the analysis of the existing high efficiency, high linearity and broadband power amplifier. A series of key scientific problems are solved to meet the high performance of high efficiency, high linearity and broadband power amplifier.Through research and analysis of the working principle of the outphasing power amplifier system in this project, a power amplifier based on the "continuous" class EF is provided as broadband amplifier circuit. Relation of drain internal capacitor and external capacitor in power transistor is studied. The influence of the power amplifier topology structure on efficiency is researched. An improved Chireix power combine technology is provided to solve the problem of two way imbalance and signal delay.After outphasing power amplifier system in the frequency of 3 ~ 5 GHz is designed and fabricated, the circuit processing test is completed to verify the validity of the method provided in the project. It is valuable for broadband power amplifier applications in the fifth generation of mobile communication with high efficiency, high linearity.

项目研究是创新性研究和解决关键技术问题相结合，在分析现有高效率、高线性度和宽带功率放大器研究基础上提出应用于5G通信系统的异相功率放大和合成电路，解决高性能功率放大器满足高效率、高线性度和宽带中一系列关键科学问题。通过研究和分析异相功率放大系统的工作原理，提出一种基于“连续”EF类功放作为宽带高效率放大电路、研究功率放大管漏极电容和外部匹配电容关系，研究功放拓扑结构对效率的影响；提出一种改进的Chireix功率合成技术，解决两路不平衡和信号延迟问题。通过设计频段在3～5GHz异相功率放大系统，并完成电路的加工测试，验证项目提出的方法的有效性，对第5代移动通信高效率、高线性度和宽带功率放大器应用有重要价值。

项目围绕线性化Outphasing功率放大器，分别从支路放大器的类型、合成器的合成方式等开展了相关研究。如：对EF类功率放大器、连续F类功率放大器、Doherty功率放大器等开展了研究；对运用马刺线带阻滤波器结构进行谐波抑制、基于阻抗缓冲概念的多级二次谐波控制输出匹配网络、利用负载补偿网络的思想采用偏移传输线代替补偿电抗、具有宽带特性的合成器等开展了研究和分析；在多个频段，如1.5到3GHz，2.4到3.4GHz，1.35到2.35GHz，2.6到3.6GHz，3到3.8GHz不同频段，采用不同合成方法与相应的功率放大器结合，形成线性度较好的Outphasing功率放大结构，采用电路仿真软件对电路进行仿真和优化，在获得了较好仿真结果基础上进行了电路加工和测试，并对测试结果进行了分析和文献报道对比。通过设计L和S波段，带宽1GHz频率范围内，研究的Outphasing功率放大电路，输出功率大于40dBm，效率大于45%，输出功率回退7dB下，效率大于35%，ACPR小于-31.7dBc。研究中，既有理论分析，又有技术创新，研究结果较好，在无线通信基站中具有较大的应用潜力。