【作者】 陈爽；

【导师】 金施群； 刘祖深；

【作者基本信息】 合肥工业大学 ， 仪器仪表工程， 2007， 硕士

【摘要】 频谱分析仪是当今射频、微波领域中最常用的测试仪器，中频信号处理则是频谱分析仪的关键技术之一。本文以高性能频谱分析仪为出发点，深入讨论了中频信号处理在频谱分析仪中的关键作用及其基本工作原理和实现方法。基于不同的应用平台，文章中分别从模拟和数字两个方面提出了相应的解决方案。解决了模拟中频信号处理中的程控带宽滤波器、步进增益放大器、对数放大器、检波器以及数字化中频信号处理的欠采样、抗混叠滤波器、数字下变频器、多速率抽取滤波器、FIR成形滤波器等一系列关键技术，对其中的每个模块进行了详细的原理分析并给出了其实现方法。最后，文章给出了相应的仿真和实验结果，并对该技术领域中存在的问题和未来发展方向提出了建议。更多还原

【Abstract】 The Spectrum Analyzer is a common measurement instrument in modern RF and microwave field, and IF signal processing is one of the key techniques of spectrum analyzer.The key role of IF Signal Processing in high performance Spectrum Analyzer is analyzed in this paper. The fundamental of IF Signal Processing and the realize methods are discussed. Two full solutions, analog and all digital IF signal processing, are proposed based on the different application platform. Several key technologies, such as programmable band-width filter, programmable step amplifier, Log amplifier and video detector in analog IF signal processing, and undersampling, digital down converter, multi-rate decimate filter, FIR filter in all digital IF signal processing are solved, in which the principles and realize methods of each module are provided. Finally, the simulations and experimental results are provided in the paper too. Furthermore, the paper discussed the problems in this field and made recommendations for future development.更多还原