共查询到19条相似文献,搜索用时 156 毫秒
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针对高速数字电路PCB中传输线间串扰的严重性,从精确分析PCB中串扰噪声的角度出发,在传统的双线耦合模型的基础上,采用了一种三线串扰耦合模型。该模型由两条攻击线和一条受害线组成,两条攻击线位于受害线的两侧,线间采取平行耦合的方式。利用信号完整性仿真软件Hyperlynx对受害线上的近端串扰噪声和远端串扰噪声进行了仿真。仿真结果表明,不同的传输模式和传输线类型、信号层与地平面的距离、耦合长度、传输线间距和信号上升/下降沿等因素会对受害线上的近端串扰和远端串扰产生较大的影响。在分析仿真结果的基础上,总结出了高速PCB设计中抑制串扰的有效措施,对高速数字电路设计有一定的指导意义。 相似文献
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设计了一种基于串扰理论的线缆护套屏蔽效能的测试方法,根据测试结果分析了屏蔽护套不同接地方式对线缆间感性耦合、容性耦合的影响,试验结果可为在实际工程中抑制线缆串扰提供依据。 相似文献
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探讨了超深亚微米设计中的高速互连线串扰产生机制,提出了一种描述高速互连串扰的电容、电感耦合模型,通过频域变换方法对模型的有效性进行了理论分析。针对0.18μm工艺条件提出了该模型的测试结构,进行了流片和测量。实测结果表明,该模型能够较好地表征超深亚微米电路的高速互连串扰效应,能够定量计算片上互连线间的耦合串扰,给出不同工艺的互连线长度的优化值。 相似文献
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衬底材料对微带线间串扰耦合的影响研究 总被引:1,自引:0,他引:1
随着系统频率的提高,衬底材料特性已成为影响信号走线之间串扰的一个不可忽略的因素。该文基于传输线方程和频域S参数对两平行微带线间串扰耦合进行理论分析,并结合全波3维电磁场仿真工具对具有不同介电常数和不同厚度的衬底材料进行了仿真和分析,得到了微带线在不同衬底下的电场分布,以及近端和远端串扰随频率、衬底介电常数和厚度变化的曲线。随着频率的增大,远端串扰将大于近端串扰,并且随着衬底介电常数和厚度的增加,微带线间的串扰呈现正弦上升的变化趋势。 相似文献
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Altered phase velocity lines are a novel kind of parallel microstrip lines for high-speed interconnection of digital circuits, on which the crosstalk is reduced by the different phase velocities of propagation on the adjacent lines. In this paper, a design method is proposed to optimize the geometry sizes of the altered phase velocity lines. The measured results of a prototype altered phase velocity pair designed by the proposed method are presented to validate the design method. And the effects of the process variation are simulated to analyze the robustness of the prototype in fabrication. The altered phase velocity lines outperform the symmetric parallel microstrip lines in terms of the lower far-end crosstalk (FrdCtk) and the lower dielectric loss. This technique reduces the FrdCtk in the pair of the microstrip transmission lines and does not significantly improve the near-end crosstalk. The prototype works at the speed of 2 Gbps for low crosstalk digital signal transmission, while it can transmit the high-speed clock signal at 10.5 GHz, so the altered phase velocity lines are a useful supplementary to the existing low crosstalk interconnection concepts in the scenario that the parallel microstrips have to be placed closely on printed circuit board. 相似文献
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非平行微带线是印刷电路板(PCB)上不可避免的互连结构。针对PCB 上非平行微带线间的串扰问题,用平行微带线近似非平行微带线,把平行耦合微带线间的串扰抵消方法应用到非平行耦合微带线中,提出了利用耦合传输线信道传输矩阵方法来进行远端串扰抵消,在对非平行耦合传输线信道传输矩阵进行特征值分解的基础上构建串扰抵消电路。仿真了非平行微带线间夹角分别为q=3°、5°、10°时的串扰,结果表明,该方法可以有效改善非平行微带线上信号眼图的质量,串扰抵消效果良好。 相似文献
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研究分析无串扰传输理想模型的条件,根据高速高密度电路板中微米级、亚毫米级互连线电磁串扰特性研究需要,首次提出微米级平行互连线的测试结构设计。经射频电路理论分析推导了测试结构对系统串扰没有影响。构建了有、无测试结构的微米级平行互连线物理模型,仿真分析后,加工制作有测试结构的微米级平行互连线电路板。研究结果表明,当数字基带信号传输频率在0~3 GHz 范围时,无测试结构仿真电路模型、有测试结构仿真电路模型、有测试结构的实验电路板,三者串扰特性吻合;微米级平行互连线的测试结构设计合理,具有工程参
考价值。 相似文献
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在高速电路设计中,信号完整性问题越来越突出,已经成为高速电路设计师不可避免的问题。该文重点研究了平行传输线间的串扰问题,通过信号完整性分析软件Hyperlynx建立了三线串扰模型并进行仿真分析,最后提出高速PCB设计中减小串扰噪声的策略。 相似文献
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In this paper, a novel routing topology is proposed to reduce crosstalk between parallel links used for high data rate application. Generally, microstrip lines are used in high frequency RF printed circuit boards for propagating high speed signals in wireless communication. Since RF front end modules in wireless system supports a wide ultra wide band frequency range from 700 MHz to 12 GHz, package density parasitic effects have been a major issue which degrades system performance. The close proximity of signal transmission lines with a high packing density results signal integrity problems such as crosstalk and timing jitter. A modified coupled microstrip line is proposed to reduce crosstalk by means of increasing capacitive coupling ratio. Our proposed structure reduced far end crosstalk by 4 dB and near end crosstalk by 4 dB than existing structures. The proposed microstrip line increased the maximum data rate from 1 to 3.3 Gb/s and reduced timing jitter by 51 ps at 3.3 Gb/s. 相似文献
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The multiconductor transmission line equations that characterize crosstalk in a multiconductor transmission line containing a shielded wire are solved in symbolic form, that is, the resulting crosstalk voltages are determined in terms of symbols rather than numerical values. The resulting solutions show the frequency range for which the widely used, low-frequency, inductive-capacitive coupling model is a valid representation. The solution shows that the inductive-capacitive coupling model is an adequate characterization of crosstalk for lines that are electrically short and whose termination impedances do not differ substantially from the characteristic impedances of the lines that are involved. For lines whose termination impedances differ drastically from the line characteristic impedances, the inductive-capacitive coupling model is valid only for frequencies where the line is extremely short, electrically. For higher frequencies of excitation, the model may give predictions that are substantially below the true crosstalk even for frequencies where the line is electrically short 相似文献