L波段准优化E类功放的研究与设计

发布时间：2019-02-08 17:22

【摘要】：作为开关类功率放大器的一种,E类功率放大器效率高、电路结构简单,具有广阔的应用前景。但E类功率放大器存在工作频率受晶体管非线性输出电容限制的问题。因此,如何提升E类功率放大器的工作频率上限一直是一个重要的研究课题。针对此问题,本论文在对E类功放准优化设计研究的基础上,重点研究了改变开关电压和电流占空比的准优化设计方法。通过这种方法,实现了E类功放工作频率上限的提升和漏极开关电压的降低。其次,论文还对E类功放的谐波终端进行了分析,设计出了一种新的具有谐波抑制作用的功放电路结构。最后,在实现工作频率提升的基础上,论文对准优化E类功放的宽带设计方法进行了研究,完成了一款L波段的高效率宽带准优化E类功放的设计与实现。论文具体工作内容要点如下:1.对改变E类功放的开关电压和电流占空比的准优化设计方法进行了研究,并分析了其对E类功放性能的影响。将该方法用于具体电路设计,并通过仿真分析进行了验证。2.对E类功放的谐波终端进行分析,设计出了一种具有谐波抑制作用的功放电路结构。在准优化设计基础上,进行了具体电路的设计,并通过仿真分析,验证了该设计的有效性。应用该设计方法,设计出了一款微带结构的准优化E类功放,并通过仿真分析,验证了设计方法的可行性。3.对准优化E类功放的宽带设计方法进行了研究,设计出了一款L波段高效率的宽带准优化E类功放。在输入和输出网络的设计中,利用阻抗优化提取的方法,将宽带匹配简化为基波匹配;采用微带线微调和低通滤波的设计方法,简化了设计,提升了效率。通过对该宽带功放的仿真设计及实物测试,验证了前面的设计方法。具体为完成了一款工作频率为900~1500MHz(相对带宽为50%)、效率大于70%、增益平坦度小于?0.5dB、输出功率大于40dBm的准优化E类功放的设计、制作和测试;完成了对测试数据的分析,提出了改进设计的思路和办法。本论文工作,对E类功放在微波频段的设计有一定的工程参考价值。
[Abstract]:As a kind of switching power amplifier, class E power amplifier has high efficiency, simple circuit structure and wide application prospect. However, the class E power amplifier has the problem that the operating frequency is limited by the nonlinear output capacitance of the transistor. Therefore, how to raise the working frequency upper limit of class E power amplifier is always an important research topic. In order to solve this problem, on the basis of the research on the quasi-optimal design of class E power amplifier, this paper focuses on the quasi-optimization design method of changing the duty cycle of switching voltage and current. By this method, the upper limit of working frequency and the decrease of drain switching voltage of class E power amplifier are realized. Secondly, the harmonic terminal of class E amplifier is analyzed, and a new power amplifier circuit structure with harmonic suppression is designed. Finally, on the basis of improving the working frequency, the paper studies the broadband design method of optimizing class E power amplifier, and completes the design and implementation of a high efficient broadband quasi-optimized class E amplifier in L-band. The main points of the thesis are as follows: 1. The quasi-optimal design method for switching voltage and current duty cycle of class E amplifier is studied, and its influence on the performance of class E amplifier is analyzed. The method is applied to the circuit design and verified by simulation. 2. The harmonic terminal of class E power amplifier is analyzed, and a power amplifier circuit structure with harmonic suppression is designed. On the basis of quasi-optimal design, the design of concrete circuit is carried out, and the validity of the design is verified by simulation analysis. Using this design method, a quasi-optimized class E power amplifier with microstrip structure is designed, and the feasibility of the design method is verified by simulation analysis. The broadband design method of class E power amplifier is studied, and a class E power amplifier with high efficiency in L-band is designed. In the design of input and output networks, the wideband matching is simplified to fundamental wave matching by the method of impedance optimization extraction, and the design method of microstrip line fine-tuning and low-pass filtering is used to simplify the design and improve the efficiency. Through the simulation design and physical test of the broadband power amplifier, the design method is verified. The design, fabrication and test of a quasi-optimized class E power amplifier with working frequency of 900~1500MHz (relative bandwidth of 50%), efficiency greater than 70db, gain flatness less than? 0.5dB and output power greater than 40dBm are designed, fabricated and tested. The analysis of test data is completed, and the idea and method of improving design are put forward. The work of this paper has some engineering reference value for the design of class E power amplifier in microwave frequency band.
【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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