宽带高效率连续型功率放大器的研究

发布时间：2018-10-14 14:25

【摘要】：连续型功率放大器是一种新型谐波控制型宽带高效率功率放大器。本文主要围绕宽带高效率连续型功率放大器工作原理和设计方法展开研究。论文主要内容和贡献归纳如下:1.文章从时域和频域总结归纳典型的高效率与宽带功率放大器功放类型。基于Load-pull/Soure-pull设计了一款工作在3.0-3.8 GHz的宽带高效率功率放大器,通过提高漏极电压来提高功放增益和输出功率。该宽带高效率功放实现了在2.95-3.75 GHz频段内小信号增益15.7±0.7 dB,在3.0-3.7 GHz频率范围内,饱和输出功率为45.32-46.33 dBm,漏极效率56.06%-64.56%。文章提出了一种基于峰值功放级联的高增益宽带高效率新型Doherty功放结构,并通过设计3.6-3.9 GHz的宽带Doherty功放进行仿真验证,实现了小信号增益13.9-14.9 dB,饱和输出功率49.3-51.1 dBm,功率附加效率(Power-added Efficiency:PAE)为56%-62.6%,功率回退7-8 dB,PAE优于50%的仿真结果。2.文章对连续B/J类,连续F类等连续型功率放大器进行系统性的理论研究,并对连续型功率放大器进行拓展,提出宽带高效率混合连续型功放工作模式。基于混合连续型功率放大器的阻抗匹配空间进行宽带高效率功放设计,其设计自由度更大,并通过设计一款相对带宽为54.5%,工作频段为1.6-2.8 GHz的宽带高效率功放验证了其可行性和优越性。该宽带高效率混合连续型功率放大器仿真所得的基波阻抗在预测的阻抗范围内或者附近,并实现了目标频带内漏极效率67.5%-81.9%,输出功率8.1-17.8 W实测结果。3.文章理论推导混合连续型功率放大器电流源平面阻抗到封装平面的转换,转换后的封装端面阻抗可直接用于输出匹配网络综合。利用封装端面的阻抗再结合Load-pull技术确定高效率高输出功率的谐波阻抗区域,设计了一款工作在1.5-2.7 GHz的宽带高效率混合连续型功率放大器,仿真所得到的基波阻抗很好的符合计算值,二次谐波在高效率高输出功率阻抗区域内并大部分靠近Smith圆图边缘,实测结果表明:在1.4-2.7 GHz频率范围内,饱和输出功率10.7-16.6 W,漏极效率达到70.4%-78.3%。在峰均比为6 dB的宽带5 MHz的WCDMA测试信号下,当ACLR临界低于-30 dBc时,平均输出功率35.2-38.1 d Bm,平均漏极效率42.2%-50.8%。
[Abstract]:Continuous power amplifier is a new type of harmonic control wideband high efficiency power amplifier. This paper focuses on the working principle and design method of broadband high efficiency continuous power amplifier. The main contents and contributions are summarized as follows: 1. This paper summarizes the typical types of high efficiency and wideband power amplifier in time domain and frequency domain. Based on Load-pull/Soure-pull, a wideband high efficiency power amplifier operating at 3.0-3.8 GHz is designed. The gain and output power of the amplifier can be improved by increasing the drain voltage. The wideband high efficiency amplifier achieves a small signal gain of 15.7 卤0.7 dB, in the 2.95-3.75 GHz band and a saturation output power of 45.32-46.33 dBm, drain efficiency of 56.06-64.56. In this paper, a novel Doherty power amplifier structure based on peak power amplifier cascade is proposed, and the design of 3.6-3.9 GHz wideband Doherty power amplifier is verified by simulation. The simulation results show that the small signal gain 13.9-14.9 dB, saturation output power 49.3-51.1 dBm, power addition efficiency (Power-added Efficiency:PAE) is 56-62.6 and the power back 7-8 dB,PAE is better than 50%. 2. In this paper, the theory of continuous B / J type and continuous F type continuous power amplifier is studied systematically, and the continuous power amplifier is extended, and the broadband and high efficiency hybrid continuous power amplifier mode is proposed. The design of wideband and high efficiency power amplifier based on impedance matching space of hybrid continuous power amplifier has greater degree of freedom. The feasibility and superiority of a broadband high efficiency amplifier with relative bandwidth of 54.5 and working frequency of 1.6-2.8 GHz are verified. The fundamental impedance obtained by the simulation of the wideband high efficiency hybrid continuous power amplifier is within or near the predicted impedance range, and the drain efficiency in the target band is 67.5-81.9, and the measured output power is 8.1-17.8 W. This paper theoretically deduces the conversion of current source plane impedance to package plane of hybrid continuous power amplifier. The converted package end surface impedance can be directly used in output matching network synthesis. The harmonic impedance region of high efficiency and high output power is determined by using the impedance of encapsulated end face and Load-pull technology. A wideband and high efficiency hybrid continuous power amplifier working in 1.5-2.7 GHz is designed. The simulation results show that the fundamental impedance is in good agreement with the calculated value. The second harmonic is in the high efficiency and high output power impedance region and most of it is close to the edge of the Smith circle. The measured results show that the second harmonic is in the frequency range of 1.4-2.7 GHz. The saturation output power is 10.7-16.6 W, and the drain efficiency is 70.4- 78.3W. When the critical value of ACLR is lower than -30 dBc, the average output power is 35.2-38.1 d and the average drain efficiency of Bm, is 42.2-50.8.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN722.75

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