低频数字程控信号源的设计摘 要本文选定了一种基于 DDS 芯片 AD9850 的方案，从而设计出了一款低频数字程控信号源。直接数字频率合成（DDS）是第三代频率合成技术，具有分辨率高、频率变换快等优点，本文主要介绍了芯片 AD9850 以及集成芯片 AT89S51 做出了详细的讲解。之后根据设计的需求，将模块分成了三个部分:上位机管理及串行接口模块，集成芯片控制模块和波信号的滤波模块，然后通过详尽的文章对于这个部分做出了充分的说明。在软件设计上，向大家简单的讲述了 LabVIEW 编程的一些基本概念，让大家对于这个软件有了一定的认识。最后，介绍了系统调试的过程，给出了实验结果，并在此基础上对信号源的性能指标进行了分析。关键词：DDS（直接数字频率合成）；单片机；LabVIEWABSTRACTIn this paper, a scheme based on DDS chip AD9850 is selected, and a low frequency digital programmable signal source is designed. Direct digital frequency synthesis (DDS) is the third generation of frequency synthesis technology, with the advantages of high resolution, fast frequency conversion, etc. This paper mainly introduces the chip AD9850 and integrated chip AT89S51 made a detailed explanation. According to the design requirements, the module is divided into three parts: PC management and serial interface module, integrated chip control module and filtering module wave signal, and then through the detailed articles for this part made a full explanation. In the software design, to tell you a simple LabVIEW programming some of the basic concepts, so that we have a certain understanding of the software. Finally, the system debugging process is introduced, and the experimental results are given.Key words: DDS (direct digital frequency synthesis); MCU; LabVIEWTimes New 目 录1 引言 .................................................... 1 1.1 研究背景....................................................11.2 程控信号源的发展概况........................................11.3 本课题...
