| 以下仅列出文章摘要、目录等部分内容，如需获取完整论文资料，或原创定制、长期合作，请随时联系。 微信QQ:312050216 |
 |
 |
| 信号源的设计与研究 摘要 本篇论文简单地介绍了信号源的基本操作原理以及其工作的流程,在电子信息领域,经常要用到一些信号作为测量的基准信号或是输入信号,信号源也就是所谓的信号发生器。信号源的优略在很大程度上决定了系统稳定性的性能，因此信号源常被我们称之为电力系统的“心脏”。随着生产水平的发展,信号发生器的应用范围也越来越普遍,其普遍程度仅次于万用表和示波器。伴随着我国计算机科学电子工程科学专业技术水平的逐步提高和不断发展,对于一个信号源的高精度的频谱控制能力要求也越来越高,要求其产品能够将一个信号源传输出来的频率甚至可以达到高达一个微波功率频段甚至更低,相应的微波频率信号分辨率甚至可以提高达到甚至m级hz,甚至可以是更小,相应的信号频数也一定会随之变得越来越多,频率的信号转换过程持续时间甚至可以提高达到甚至ns的等级,频谱的控制纯度也一定会随之变得更高,同时特别是对于信号频率的控制功耗、体积、重量等都要求是最主要的。对此的具体要求也愈加严格。想要能够制造一个具有高性能的射频信号源,唯一的解决途径也就是在采用科学化的技术以及方法上面才能够不断取得新的技术突破。为了能满足以上对于通用信号频率发生器的一些特殊应用性能的技术需求,研究人员设计或者开发研制出一款比较高的转换频率与信号分辨率、转换持续时间较少以及不同频谱信号纯度较高的通用信号频率发生器已经逐渐发展成为当今人们普遍需要关注的一个问题。我们所需要做的,就是结合FPGA元件,优化设计DDS的信号源,保障DDS信号源具备高精度的运行能力,拓展其在电子领域内的应用范围。 因此，本文在FPGA的参与下，分析DDS高精度信号源的设计方式并设计出一个高精度的信号发生器，最大程度的优化电力元件的执行编程，完善信号源的整个传输过程， 促使控制信号在上位机到信号输出的过程中，处于高精度的分配状态，严格按照DDS的技术要求进行传输。 关键词：信号发生器、频率步进、占空比、FPGA、DDS、高精度。 ABSTRACT This paper introduces the basic working principle and work flow of the signal source. In the field of electronic information, it is often necessary to use some signals as the reference signal or input signal for measurement. The signal source is also called the signal generator. The quality of signal source determines the performance of the system to a great extent, so the signal source is often called the "heart" of power electronic system. With the development of production level, the application range of signal generator is becoming more and more common, which is second only to multimeter and oscilloscope. Along with the development of electronic technology, more and more high to the requirement of accuracy of signal source, requires it to output high frequency microwave frequencies is even higher level corresponding frequency resolution can reach m Hz, even smaller, the corresponding frequency more and more, the frequency conversion time can reach ns level, higher frequency spectrum purity, at the same time the frequency of the power consumption, volume, weight and other elements It's getting higher and higher. To manufacture high performance signal source, the only way is to be able to have a new breakthrough in technical means. In order to meet the above high performance requirements of the signal generator, the research and design of a signal generator with higher frequency and resolution, less conversion time and higher spectral purity has become the focus of people's extensive attention. What we need to do is to combine FPGA components to optimize the design of DDS signal source, ensure that the DDS signal source has high precision operation ability, and expand its application scope in the electronic field. Therefore, with the participation of FPGA, this paper analyzes the design method of DDS high-precision signal source and designs a high-precision signal generator to optimize the execution programming of power components to the greatest extent and improve the whole transmission process of the signal source. To promote the control signal in the upper computer to signal output process, in a high-precision distribution , in strict accordance with the technical requirements of DDS transmission. Key words: Signal generator, Frequency of stepper, Duty cycle，FPGA，DDS. 目录 一、绪论2 1.1研究背景2 1.2方案论证3 1.2.1正弦波产生3 1.2.2方波产生3 1.2.3幅度调整3 二、主要电路设计与计算4 2.1系统原理总图4 2.2直接数字合成5 2.2.1 DDS的基本原理5 2.2.2 DDS各部分的具体参数及相互关系5 2.3FPGA信号发生部分6 2.3.1 正弦波6 2.3.2 方波7 2.4 波形处理部分7 2.4.1 正弦波7 2.4.2 方波8 2.5 FSK信号输出8 2.6 单片机控制电路设计9 2.6.1 主要功能介绍9 2.7 调幅模块设计10 2.7.1 MC1496内部结构10 2.8 幅度控制11 三、软件设计12 3.1 软件实现思想12 3.2 软件流程图12 四、系统调试13 4.1 硬件电路调试13 4.1.1 调试过程13 4.1.2 经验总结13 4.2 软件调试14 4.3 总调试16 结论18 参考文献19 |
