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刘永勤 《渭南师范学院学报》2011,(12):42-45
高速PCB中，由于过孔数量较多导致信号产生严重畸变．文章首先分析了过孔对高速信号质量的影响，然后通过在过孔周围添加去耦电容器来抑制同步开关噪声（SSN）．结果表明，在过孔周围添加去耦电容器可以有效地减小同步开关噪声，使得信号波动峰值减小，提高了信号质量． 相似文献
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Yin-jun Wang Cheng Zhuo Jun-yong Deng Jin-fang Zhou Kang-sheng Chen 《浙江大学学报(A卷英文版)》2008,9(6):849-857
Power integrity （PI） has become a limiting factor for the chip＇s overall performance, and how to place in-package decoupling capacitors to improve a chip＇s PI performance has become a hot issue. In this paper, we propose an improved transmission matrix method （TMM） for fast decoupling capacitance allocation. An irregular grid partition mechanism is proposed, which helps speed up the impedance computation and complies better with the irregular power/ground （P/G） plane or planes with many vias and decoupling capacitors. Furthermore, we also ameliorate the computation procedure of the impedance matrix whenever decoupling capacitors are inserted or removed at specific ports. With the fast computation of impedance change, in-package decoupling capacitor allocation is done with an efficient change based method in the frequency domain. Experimental results show that our approach can gain about 5× speedup compared with a general TMM, and is efficient in restraining the noise on the P/G plane. 相似文献
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Roberta Lamb 《The Information Society》2013,29(3):195-196
Abstract This paper summarizes the concept of privacy, reviews some of its underlying tenets and axioms, illustrates the drift toward a national counterprivacy posture in terms of events involving the Social Security number (SSN), and discusses new faces in terms of three case histories: the California action to require SSNs on driver's licenses, the effort by telephone companies to introduce calling number identification, and the aggregation of public records into dossier databases. Remedial actions by government and legislators are suggested. 相似文献
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刘永勤 《渭南师范学院学报》2012,(12):44-45,52
设计了一种S型桥接电磁带隙结构,并将S型桥接电磁带隙结构与传统的平行板以及L型桥接电磁带隙结构进行了比较.分析结果表明:采用S型桥接电磁带隙结构不仅提高了抑制噪声的带宽,而且可减少本地去耦电容器的数目. 相似文献
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防火墙自1986年至今已经经历了四个阶段的发展,在防火墙的安全策略中明确了如何进行安全设计,并结合拓扑结构对第四代防火墙的技术与功能做了详细介绍. 相似文献
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