一种基于LDMOS管的脉冲放大器的研究与设计
发布时间：2018-12-15 07:02
【摘要】：功率放大器在通信、雷达、导航等系统中扮演了极为重要的角色,是现代无线通信系统的核心部件,其性能的好坏将影响整个系统性能。因此,更高输出功率、更高效率、更高增益、更宽带宽的功率放大器一直是备受期待的。LDMOS晶体管的出现,在一定程度上迎合了这种需求。基于LDMOS管的功率放大器以其良好的线性度、效率以及成本较低等特点而被广泛应用,特别是在无线通信系统中。由于单管输出功率相对较低,通常可采用功率合成技术。本文首先介绍了功率放大器的基础理论以及各项主要设计指标,梳理了功率放大器设计的主要内容,并简单介绍了功率合成技术。其次,针对LDMOS管主要运用在RF频段这一特点,而宽带功率合成技术不可避免地要设计宽带功率分配/合成网络,本文采用平面人工传输线技术解决小型化宽带功分网络这一问题。本文在对平面人工传输线进行细致的分析后,通过用两级人工传输线等效的四分之一波长阻抗变换结构,设计了小型化宽带功分网络。HFSS仿真结果显示功分器在0.5GHz~1.4GHz范围内性能良好。最后,本文设计了基于LDMOS管的宽带功率放大器。设计了具有三级四分之一波长切比雪夫阻抗变换结构的宽带功率合成网络,仿真结果良好。利用仿真软件对晶体管进行负载牵引和源牵引,得到输入阻抗和输出阻抗,并在此基础上采用共轭匹配方法设计出匹配电路网络。将宽带功分合成网络的HFSS仿真数据导入ADS软件,搭建好功率放大器整体电路并进行仿真,优化设计了工作在0.5GHz~1.4GHz内,小信号增益大于15.5dB的功率放大器。最后根据仿真版图绘制了实际加工版图及装配图,制作了功放实物,完成了调试和测试。脉冲测试结果显示在0.5GHz~1.4GHz内,功放最大增益为19.5dB,最大输出功率为42.7dBm,最大漏极效率为52.2%。本文对设计宽带脉冲功率放大器具有一定的指导意义。
[Abstract]:Power amplifier plays an important role in communication, radar, navigation and other systems. It is the core component of modern wireless communication system, and its performance will affect the performance of the whole system. Therefore, power amplifiers with higher output power, higher efficiency, higher gain and wider bandwidth have always been highly anticipated. The appearance of LDMOS transistors caters to this demand to some extent. Power amplifiers based on LDMOS transistors are widely used in wireless communication systems due to their good linearity, efficiency and low cost. Because the output power of single tube is relatively low, power combination technology is usually used. In this paper, the basic theory of power amplifier and its main design indexes are introduced, the main contents of power amplifier design are summarized, and the technology of power synthesis is briefly introduced. Secondly, aiming at the characteristic that LDMOS tube is mainly used in the RF band, the broadband power combination technology inevitably has to design the broadband power distribution / synthesis network. In this paper, planar artificial transmission line technology is used to solve the problem of miniaturized broadband power distribution network. After detailed analysis of planar artificial transmission line, the equivalent 1/4 wavelength impedance conversion structure of two-stage artificial transmission line is used in this paper. A miniaturized wideband power division network is designed, and the HFSS simulation results show that the power divider performs well in the range of 0.5GHz~1.4GHz. Finally, a broadband power amplifier based on LDMOS transistor is designed. A wideband power synthesis network with a three-stage 1/4 wavelength Chebyshev impedance transform structure is designed and the simulation results are satisfactory. The input impedance and output impedance are obtained by using the simulation software to pull the transistor load and source, and the matching circuit network is designed by conjugate matching method. The HFSS simulation data of wideband power division synthesis network is imported into ADS software. The whole circuit of power amplifier is built and simulated. The power amplifier with small signal gain larger than 15.5dB is optimized and designed in 0.5GHz~1.4GHz. Finally, according to the simulation layout, the actual processing layout and assembly diagram are drawn, the power amplifier is made, and the debugging and testing are completed. The pulse test results show that the maximum gain of power amplifier is 19.5 dB, the maximum output power is 42.7 dBm, and the maximum drain efficiency is 52.2 dB in 0.5GHz~1.4GHz. This paper has a certain guiding significance for the design of broadband pulse power amplifier.
【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
本文编号：2380189
[Abstract]:Power amplifier plays an important role in communication, radar, navigation and other systems. It is the core component of modern wireless communication system, and its performance will affect the performance of the whole system. Therefore, power amplifiers with higher output power, higher efficiency, higher gain and wider bandwidth have always been highly anticipated. The appearance of LDMOS transistors caters to this demand to some extent. Power amplifiers based on LDMOS transistors are widely used in wireless communication systems due to their good linearity, efficiency and low cost. Because the output power of single tube is relatively low, power combination technology is usually used. In this paper, the basic theory of power amplifier and its main design indexes are introduced, the main contents of power amplifier design are summarized, and the technology of power synthesis is briefly introduced. Secondly, aiming at the characteristic that LDMOS tube is mainly used in the RF band, the broadband power combination technology inevitably has to design the broadband power distribution / synthesis network. In this paper, planar artificial transmission line technology is used to solve the problem of miniaturized broadband power distribution network. After detailed analysis of planar artificial transmission line, the equivalent 1/4 wavelength impedance conversion structure of two-stage artificial transmission line is used in this paper. A miniaturized wideband power division network is designed, and the HFSS simulation results show that the power divider performs well in the range of 0.5GHz~1.4GHz. Finally, a broadband power amplifier based on LDMOS transistor is designed. A wideband power synthesis network with a three-stage 1/4 wavelength Chebyshev impedance transform structure is designed and the simulation results are satisfactory. The input impedance and output impedance are obtained by using the simulation software to pull the transistor load and source, and the matching circuit network is designed by conjugate matching method. The HFSS simulation data of wideband power division synthesis network is imported into ADS software. The whole circuit of power amplifier is built and simulated. The power amplifier with small signal gain larger than 15.5dB is optimized and designed in 0.5GHz~1.4GHz. Finally, according to the simulation layout, the actual processing layout and assembly diagram are drawn, the power amplifier is made, and the debugging and testing are completed. The pulse test results show that the maximum gain of power amplifier is 19.5 dB, the maximum output power is 42.7 dBm, and the maximum drain efficiency is 52.2 dB in 0.5GHz~1.4GHz. This paper has a certain guiding significance for the design of broadband pulse power amplifier.
【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
【参考文献】
相关硕士学位论文 前1条
1 孙胜雷;C波段脉冲功率放大器的研制[D];电子科技大学;2006年
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