基于DDS的数字基带模块设计与实现

发布时间：2018-05-07 16:38

本文选题：数字基带模块 + 直接数字频率合成　；参考：《电子科技大学》2015年硕士论文

【摘要】：信号发生器的用途十分广泛,随着科学技术的不断进步,当今行业发展的主要趋势便是不断的研发出具有更高性能的信号发生器来满足在雷达、通信、自动化等领域的广泛需求。而具有高精度、高稳定性等特点的直接数字频率合成技术则是信号发生器的核心技术之一,也是现今各大公司的研究重点之一。本论文将基于直接数字频率合成技术来设计与实现数字基带信号发生器模块。本文首先将对直接数字频率合成技术的基本原理及理论基础进行了研究,然后给出了四种数字基带模块的设计方案构思,分别是FPGA加高速数模转换器方案,控制器加直接数字频率合成芯片方案,而控制器选用方案则包括了MCU、DSP以及FPGA三种。通过分析以上四种方案的特点,选择其中一个最合适的方案进行硬件设计,最终根据模块功能性能指标要求将模块设计划分为五个功能电路单元以便于开展模块硬件设计工作。其次,本文将展示基于DDS的数字基带模块的总体设计方案以及硬件设计工作流程。具体分析各个单元电路及其外围电路的设计原理,包括了直接数字频率合成芯片外围配置及滤波电路设计、时钟单元电路设计、FPGA单元电路设计、电源单元电路设计。在本文中,还将介绍信号完整性在印制电路板设计中的重要参考价值,并按照信号完整性的基本要求完成模块的印制电路板设计规划;其次,根据规划实施具体的印制电路板电路设计,包括印制电路板的叠层结构以及布局布线;最后,从电源设计、印制电路板接地设计、硬件抗干扰设计以及电磁兼容性设计等方面对模块可靠性进行了设计。高频、高速电路的印制电路板设计是复杂繁琐的过程,众多因素相互影响,而各种因素最终都会影响到模块的功能性能指标。设计时需要遵守印制电路板设计规范,在设计优先级上权衡利弊以寻求最优设计,才能够设计出满足功能性能及可靠性要求的印制电路板。最后经过实践验证,本课题的模块设计满足功能性能指标要求,工作稳定可靠。
[Abstract]:Signal generator is widely used. With the development of science and technology, the main trend of current industry development is to develop signal generator with higher performance to meet the needs of radar and communication. Extensive needs in areas such as automation. Direct digital frequency synthesizer with high precision and high stability is one of the core technologies of signal generator, and also one of the research emphases of many companies. This paper will design and implement the digital baseband signal generator module based on direct digital frequency synthesis technology. In this paper, the basic principle and theoretical basis of direct digital frequency synthesis (DDS) technology are studied, and then four design schemes of digital baseband module are presented, which are FPGA plus high speed digital-to-analog converter (DADC). The controller and direct digital frequency synthesizer (DDS) are selected, and the controller includes MCU DSP and FPGA. By analyzing the characteristics of the above four schemes, one of the most suitable schemes is selected for hardware design. Finally, the module design is divided into five functional circuit units according to the requirements of the functional performance index of the module, so as to facilitate the hardware design of the module. Secondly, this paper will show the overall design scheme and hardware design workflow of digital baseband module based on DDS. The design principle of each unit circuit and its peripheral circuit is analyzed, including the peripheral configuration and filter circuit design of direct digital frequency synthesizer chip, clock cell circuit design and FPGA cell circuit design, power supply unit circuit design. In this paper, we will also introduce the important reference value of signal integrity in PCB design, and complete the PCB design planning of the module according to the basic requirements of signal integrity. According to the plan, the specific circuit design of printed circuit board is implemented, including the laminated structure and layout and wiring of the printed circuit board; finally, from the power source design, the grounding design of the printed circuit board, Hardware anti-jamming design and electromagnetic compatibility design are used to design the reliability of the module. The design of high frequency and high speed printed circuit board is a complicated process, many factors affect each other, and all kinds of factors will affect the functional performance of the module. In order to meet the requirements of functional performance and reliability, the PCB should be designed according to the design specifications, and the advantages and disadvantages should be weighed on the design priorities in order to find the optimal design. Finally, it is proved by practice that the design of the module meets the functional performance requirements and the work is stable and reliable.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN741

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