小步进Ku波段低相噪低杂散频率合成器的研究
发布时间：2018-10-23 13:26
【摘要】：通信、雷达技术经过长足的发展,低频段的频谱资源变的越来越匮乏,毫米波通信所具有高达270G的频谱资源及短波长带来的小型化优点使与其相关的技术迅速发展。微波毫米波频率综合器作为通信设备中关键组成部分,它输出频率的稳定度、准确度直接影响系统的整体性能。建立在Ku频段上变频通信设备研制的基础上,本论文主要对Ku频段频率综合器的研究设计进行论述。本文首先对比分析直接式频率合成、锁相式频率合成、直接数字式频率合成三种合成方式的优缺点,确定各自分别适用的具体工程场景。其次,根据系统指标要求分析推算锁相式频率合成和直接数字式频率合成的输出频谱,并且结合多种混合式频率合成方式进行关键指标分析,重点是每种频率合成方式对相位噪声、频率步进、杂散的影响。最终,确定以DDS激励PLL和PDRO混频的方式实现系统频率合成方案设计,并采用可变频率的时钟及规避出现近端杂散频段的方法来进一步降低频谱杂散。在该方案的基础上,结合选型器件,利用ADIsimPLL和ADIsimDDS两款软件对相位噪声和杂散进行分析,进一步验证方案的可行性。同时,使用ADS和HFSS进行滤波器的设计优化,保证输出频谱达到系统要求。最后,使用Protel, AutoCAD、Solidworks等工具软件进行电路原理图、版图和腔体结构的设计,完成小步进Ku波段低相噪低杂散频率合成器的研制。最终,系统实现Ku波段1Hz步进、相位噪声低于-90dBc/Hz@10kHz、杂散抑制优于60dBc的本振信号输出,并具有1.5GHz的输出带宽。
[Abstract]:With the rapid development of communication and radar technology, the spectrum resources in the low frequency band become more and more scarce. The millimeter wave communication has the advantages of up to 270 gigabytes of spectrum resources and miniaturization of short wavelength, which makes the related technology develop rapidly. Microwave millimeter wave frequency synthesizer is a key component of communication equipment. Its output frequency stability and accuracy directly affect the overall performance of the system. Based on the development of Ku up-conversion communication equipment, this paper mainly discusses the research and design of Ku frequency synthesizer. In this paper, the advantages and disadvantages of direct frequency synthesis, phase-locked frequency synthesis and direct digital frequency synthesis are compared and analyzed. Secondly, the output frequency spectrum of phase-locked frequency synthesis and direct digital frequency synthesis are analyzed according to the requirements of the system index, and the key indexes are analyzed in combination with a variety of hybrid frequency synthesis methods. The emphasis is on the effect of each frequency synthesis mode on phase noise, frequency stepping and spurious. Finally, the scheme of system frequency synthesis is designed by DDS exciting PLL and PDRO mixing, and the method of variable frequency clock and avoiding near-end spurious band is adopted to further reduce the frequency spurious. On the basis of this scheme, the phase noise and spurious noise are analyzed by ADIsimPLL and ADIsimDDS, and the feasibility of the scheme is further verified. At the same time, ADS and HFSS are used to optimize the filter design to ensure that the output spectrum meets the system requirements. Finally, the circuit principle, layout and cavity structure are designed by using Protel, AutoCAD,Solidworks and other tools, and the low phase noise low spurious frequency synthesizer in the small step Ku band is developed. Finally, the Ku band 1Hz step is realized, the phase noise is less than -90 dBc / Hz @ 10kHz, the spurious suppression is superior to the local oscillator output of 60dBc, and the output bandwidth of 1.5GHz is obtained.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN74
，
本文编号：2289392
[Abstract]:With the rapid development of communication and radar technology, the spectrum resources in the low frequency band become more and more scarce. The millimeter wave communication has the advantages of up to 270 gigabytes of spectrum resources and miniaturization of short wavelength, which makes the related technology develop rapidly. Microwave millimeter wave frequency synthesizer is a key component of communication equipment. Its output frequency stability and accuracy directly affect the overall performance of the system. Based on the development of Ku up-conversion communication equipment, this paper mainly discusses the research and design of Ku frequency synthesizer. In this paper, the advantages and disadvantages of direct frequency synthesis, phase-locked frequency synthesis and direct digital frequency synthesis are compared and analyzed. Secondly, the output frequency spectrum of phase-locked frequency synthesis and direct digital frequency synthesis are analyzed according to the requirements of the system index, and the key indexes are analyzed in combination with a variety of hybrid frequency synthesis methods. The emphasis is on the effect of each frequency synthesis mode on phase noise, frequency stepping and spurious. Finally, the scheme of system frequency synthesis is designed by DDS exciting PLL and PDRO mixing, and the method of variable frequency clock and avoiding near-end spurious band is adopted to further reduce the frequency spurious. On the basis of this scheme, the phase noise and spurious noise are analyzed by ADIsimPLL and ADIsimDDS, and the feasibility of the scheme is further verified. At the same time, ADS and HFSS are used to optimize the filter design to ensure that the output spectrum meets the system requirements. Finally, the circuit principle, layout and cavity structure are designed by using Protel, AutoCAD,Solidworks and other tools, and the low phase noise low spurious frequency synthesizer in the small step Ku band is developed. Finally, the Ku band 1Hz step is realized, the phase noise is less than -90 dBc / Hz @ 10kHz, the spurious suppression is superior to the local oscillator output of 60dBc, and the output bandwidth of 1.5GHz is obtained.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN74
，
本文编号：2289392
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