TMS320DM365视频电路板设计与信号完整性分析

发布时间：2018-05-02 02:23

本文选题：DM365 + PCB　；参考：《浙江工业大学》2015年硕士论文

【摘要】：当前,电子系统设计已经全面进入高速电路设计时代,时钟频率的提高和电路板集成度的增加引发了诸多的信号完整性问题。在PCB设计中,布局、布线、元件选取都需要考虑信号完整性;只有把反射、串扰、时序、电源完整性、SSN噪声这些问题解决好,才能很好的设计成功一块电路板。本文讨论了dm365视频电路板的板级仿真和设计实现过程:首先完成电路板的原理图设计;在整个PCB设计过程中贯穿信号完整性设计思想,将布线前仿真结果转化为约束规则指导该dm365的PCB设计,并对布线后的PCB进行仿真验证;最后对主板进行测试验证,完成dm365的PCB设计功能。相比于传统的PCB设计流程,本文所采用的方法具有开发周期短,早发现问题早处理问题,一次成功率大等优点。本文重点分析了dm365电路板设计过程中必须要面对的信号完整性问题。对于内存各总线的反射分析,得出了阻抗匹配策略。对于串扰问题,讨论了耦合长度和间距对串扰的影响,得出了抑制串扰的布线方法。对于内存总线的时序问题,推导了内存模块必须要满足的时序关系式,并进行了布线后的时序仿真,验证电路板的布线是否满足时序关系式,从而指导内存模块的布线。分析了电源分配网络的设计方法,提出了改进的目标阻抗方法,并基于此方法,对电源分配网络进行设计,指导去耦电容的选型和摆放,从而减小同步开关噪声。对整个电路板的电源平面进行了谐振分析,指导了电路板的布局设计。此外,本文还详细描述了视频电路板的主要的功能模块的原理图电路设计,包括内存DDR2模块、视频TVP5146m2模块、电源模块等等。并在此基础上设计的PCB电路板封装设计、叠层设计、布局布线,并在仿真的基础上对电路板做出改进。
[Abstract]:At present, electronic system design has entered the era of high-speed circuit design. The improvement of clock frequency and the increase of circuit board integration lead to many problems of signal integrity. In the PCB design, the layout, wiring and component selection all need to consider the signal integrity; only by solving the problems of reflection, crosstalk, timing, power integrity and PCB noise, can a circuit board be successfully designed. This paper discusses the board level simulation and design process of dm365 video circuit board: first, the schematic design of the circuit board is completed; the whole PCB design process runs through the idea of signal integrity design. The simulation results before routing are transformed into constraint rules to guide the PCB design of the dm365, and the PCB after routing is simulated and verified. Finally, the main board is tested and verified to complete the PCB design function of dm365. Compared with the traditional PCB design process, the method adopted in this paper has the advantages of short development cycle, early problem detection and early processing, and high primary success rate. In this paper, the problem of signal integrity that must be faced in the design of dm365 circuit board is analyzed. For the reflection analysis of each bus in memory, the impedance matching strategy is obtained. For crosstalk, the effects of coupling length and spacing on crosstalk are discussed, and the routing method to suppress crosstalk is obtained. For the timing problem of the memory bus, the timing relation that the memory module must satisfy is deduced, and the timing simulation after wiring is carried out to verify whether the wiring of the circuit board meets the timing relation, so as to guide the routing of the memory module. The design method of power distribution network is analyzed, and an improved target impedance method is proposed. Based on this method, the power distribution network is designed to guide the selection and placement of decoupling capacitors so as to reduce the synchronous switching noise. The resonant analysis of the power plane of the whole circuit board is carried out, which guides the layout design of the circuit board. In addition, the schematic circuit design of main function modules of video circuit board is described in detail, including memory DDR2 module, video TVP5146m2 module, power module and so on. On this basis, the packaging design, lamination design, layout and wiring of PCB circuit board are designed, and the circuit board is improved on the basis of simulation.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN41

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