【摘要】：作為開關類功率放大器的一種,E類功率放大器效率高、電路結(jié)構簡單,具有廣闊的應用前景。但E類功率放大器存在工作頻率受晶體管非線性輸出電容限制的問題。因此,如何提升E類功率放大器的工作頻率上限一直是一個重要的研究課題。針對此問題,本論文在對E類功放準優(yōu)化設計研究的基礎上,重點研究了改變開關電壓和電流占空比的準優(yōu)化設計方法。通過這種方法,實現(xiàn)了E類功放工作頻率上限的提升和漏極開關電壓的降低。其次,論文還對E類功放的諧波終端進行了分析,設計出了一種新的具有諧波抑制作用的功放電路結(jié)構。最后,在實現(xiàn)工作頻率提升的基礎上,論文對準優(yōu)化E類功放的寬帶設計方法進行了研究,完成了一款L波段的高效率寬帶準優(yōu)化E類功放的設計與實現(xiàn)。論文具體工作內(nèi)容要點如下:1.對改變E類功放的開關電壓和電流占空比的準優(yōu)化設計方法進行了研究,并分析了其對E類功放性能的影響。將該方法用于具體電路設計,并通過仿真分析進行了驗證。2.對E類功放的諧波終端進行分析,設計出了一種具有諧波抑制作用的功放電路結(jié)構。在準優(yōu)化設計基礎上,進行了具體電路的設計,并通過仿真分析,驗證了該設計的有效性。應用該設計方法,設計出了一款微帶結(jié)構的準優(yōu)化E類功放,并通過仿真分析,驗證了設計方法的可行性。3.對準優(yōu)化E類功放的寬帶設計方法進行了研究,設計出了一款L波段高效率的寬帶準優(yōu)化E類功放。在輸入和輸出網(wǎng)絡的設計中,利用阻抗優(yōu)化提取的方法,將寬帶匹配簡化為基波匹配;采用微帶線微調(diào)和低通濾波的設計方法,簡化了設計,提升了效率。通過對該寬帶功放的仿真設計及實物測試,驗證了前面的設計方法。具體為完成了一款工作頻率為900~1500MHz(相對帶寬為50%)、效率大于70%、增益平坦度小于?0.5dB、輸出功率大于40dBm的準優(yōu)化E類功放的設計、制作和測試;完成了對測試數(shù)據(jù)的分析,提出了改進設計的思路和辦法。本論文工作,對E類功放在微波頻段的設計有一定的工程參考價值。
[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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN722.75

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