3GHz频谱分析仪射频模块的设计与实现
发布时间：2018-11-22 08:10
【摘要】：频谱分析仪是频域测量中用途最广,使用量最大的一类测量仪器。超外差式结构是频谱分析仪设计中采用的主要结构,它决定了频谱分析仪射频模块的整体结构方案,而射频模块是实现频谱仪设计的关键技术之一,它的很多关键性能指标对频谱分析仪的整机性能有着重要影响。本论文主要实现经济型、高性能和结构简单型的频谱仪射频模块的设计。论文首先介绍了频谱仪射频模块设计的国内外现状,分析了射频模块的关键技术指标及其相互关系和影响因素。通过对指标和技术难题分析,设计了实现3GHz频谱分析仪射频模块的三级变频外差式结构,确定了射频模块主要由三大模块组成:射频通道链路模块、本振频率合成源模块和控制电路模块。射频通道链路模块主要包括两级程控衰减模块、低噪声放大模块、三级变频模块(第一级变频采用高中频方案)和滤波器选频模块组成。并对噪声系数、增益进行了分析,用ADS2008中的BUGET工具对整个链路进行了预算仿真,并利用HFSS和IE3D电磁波仿真软件,对射频模块中的关键微带滤波器进行了设计和仿真。本振合成源模块主要实现4.1357GHz~7.1357GHz的扫频源设计和固定频率的二三本振源设计,并结合功率补偿电路和滤波电路实现对本振信号的调理,以达到设计的指标要求。扫频源主要采用PLL芯片加高性能VCO实现,比采用YTO更节约成本和空间。控制模块采用DSP+FPGA的结构,SPI四线数据传输方式,实现对扫频源和其它程控芯片的控制,从而实现整个射频模块的功能。最后论文完成了射频模块硬件电路的设计及调试,并对本振源信号,第三中频输出信号10.7MHz进行了相关指标的测试。结果表明本设计的射频模块方案实现了要求的指标及功能需求。
[Abstract]:Spectrum analyzer is one of the most widely used and widely used measurement instruments in frequency domain. The superheterodyne structure is the main structure used in the design of the spectrum analyzer. It determines the overall structure of the RF module of the spectrum analyzer, and the RF module is one of the key technologies to realize the design of the spectrum analyzer. Many of its key performance indicators have an important impact on the overall performance of the spectrum analyzer. This paper mainly realizes the design of RF module of economic, high performance and simple structure. Firstly, this paper introduces the current situation of RF module design at home and abroad, and analyzes the key technical indexes of RF module, its relationship and influencing factors. Based on the analysis of indexes and technical problems, the three-stage heterodyne structure of RF module of 3GHz spectrum analyzer is designed. The RF module is mainly composed of three modules: RF channel link module. The local oscillator frequency synthesizer module and the control circuit module. The radio frequency channel link module mainly includes two stage program control attenuation module, low noise amplifier module, three stage frequency conversion module (the first stage frequency conversion adopts high frequency scheme) and filter frequency selecting module. The noise coefficient and gain are analyzed, the budget of the whole link is simulated with BUGET tool in ADS2008, and the key microstrip filter in RF module is designed and simulated by HFSS and IE3D electromagnetic wave simulation software. The local oscillator synthesizer module mainly realizes the design of 4.1357GHz~7.1357GHz frequency sweep source and fixed frequency local oscillator, and combines the power compensation circuit and filter circuit to adjust the local oscillator signal in order to meet the design requirements. The sweep frequency source is mainly realized by PLL chip and high performance VCO, which saves more cost and space than using YTO. The control module adopts the structure of DSP FPGA and the four-wire data transmission mode of SPI to realize the control of the frequency sweep source and other program-controlled chips so as to realize the function of the whole RF module. Finally, the hardware circuit of RF module is designed and debugged, and the local oscillator source signal and the third intermediate frequency output signal 10.7MHz are tested. The results show that the proposed RF module has achieved the required targets and functional requirements.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM935.21
本文编号：2348643
[Abstract]:Spectrum analyzer is one of the most widely used and widely used measurement instruments in frequency domain. The superheterodyne structure is the main structure used in the design of the spectrum analyzer. It determines the overall structure of the RF module of the spectrum analyzer, and the RF module is one of the key technologies to realize the design of the spectrum analyzer. Many of its key performance indicators have an important impact on the overall performance of the spectrum analyzer. This paper mainly realizes the design of RF module of economic, high performance and simple structure. Firstly, this paper introduces the current situation of RF module design at home and abroad, and analyzes the key technical indexes of RF module, its relationship and influencing factors. Based on the analysis of indexes and technical problems, the three-stage heterodyne structure of RF module of 3GHz spectrum analyzer is designed. The RF module is mainly composed of three modules: RF channel link module. The local oscillator frequency synthesizer module and the control circuit module. The radio frequency channel link module mainly includes two stage program control attenuation module, low noise amplifier module, three stage frequency conversion module (the first stage frequency conversion adopts high frequency scheme) and filter frequency selecting module. The noise coefficient and gain are analyzed, the budget of the whole link is simulated with BUGET tool in ADS2008, and the key microstrip filter in RF module is designed and simulated by HFSS and IE3D electromagnetic wave simulation software. The local oscillator synthesizer module mainly realizes the design of 4.1357GHz~7.1357GHz frequency sweep source and fixed frequency local oscillator, and combines the power compensation circuit and filter circuit to adjust the local oscillator signal in order to meet the design requirements. The sweep frequency source is mainly realized by PLL chip and high performance VCO, which saves more cost and space than using YTO. The control module adopts the structure of DSP FPGA and the four-wire data transmission mode of SPI to realize the control of the frequency sweep source and other program-controlled chips so as to realize the function of the whole RF module. Finally, the hardware circuit of RF module is designed and debugged, and the local oscillator source signal and the third intermediate frequency output signal 10.7MHz are tested. The results show that the proposed RF module has achieved the required targets and functional requirements.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM935.21
【参考文献】
相关硕士学位论文 前1条
1 刘荣庭;3GHz频谱分析仪射频通道设计[D];电子科技大学;2013年
，本文编号：2348643
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