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针对目前印制电路板中采用的同步开关噪声抑制方法抑制带宽较窄、全向性较差、电源平面有效使用面积小、结构复杂及对信号质量影响大的问题,提出了一种基于螺旋谐振环结构的超宽带同步开关噪声抑制平面,具有结构简单、阻带宽、抑制方向具有全向性、无需周期性电磁带隙结构的特点。通过研究其等效电路模型,使用三维有限元法( FEM)对所设计的结构提取了S参数,并进行了频域与时域分析与仿真。仿真结果表明:所提出的结构其同步开关噪声抑制深度在-40 dB时,阻带范围为0.13~20 GHz,抑制带宽达到19.87 GHz,有效降低了带隙中心频率;当注入噪声电压为1 V时,可将噪声电压抑制到0.25 mV;对比UC-EBG和Planar EBG结构,在-40 dB抑制深度时,抑制带宽分别提高了16.97 GHz和17.73 GHz。 相似文献
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研究了介质型电磁带隙结构对高速电路中电源/ 地平面间同步开关噪声的抑制作用。该介质型电磁带隙结构在抑制同步开关噪声的同时未破坏高速信号的电流返回路径,使高速信号的信号完整性得以保持。利用电磁场有限元方法将电源/地平面间同步开关噪声抑制的三维问题转化成二维问题进行处理,提高了计算效率。分析了介质型电磁带隙结构的介电常数对噪声抑制带宽的影响,利用了三维全波电磁场仿真软件HFSS对二维数值结
果进行仿真验证,仿真结果与数值计算结果基本吻合,验证了二维数值算法的正确性。 相似文献
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半导体技术快速发展,双倍数据速率同步动态随机存取存储器(Double Data Rata Synchronous Dynamic
Random Access Memory, DDR SDRAM)的信号完整性问题已成为设计难点。文中提出了一种基于ANSYS 软
件和IBIS 5. 0 模型的DDR4 SDRAM 信号完整性仿真方法。利用IBIS 5. 0 模型中增加的复合电流(Composite Current)
、同步开关输出电流等数据,对DDR4 SDRAM 高速电路板的信号完整性进行更准确的仿真分析。仿真结果
表明:高速信号在经过印制板走线和器件封装后,信号摆幅和眼图都有明显恶化;在仿真电路的电源上增加去耦
电容后,信号抖动和收发端同步开关噪声(Synchronous Switching Noise, SSN)都得到明显改善;在不加去耦电容的
情况下,将输入信号由PRBS 码换成DBI 信号,接收端的同步开关噪声有所改善,器件功耗可以降为原来的一半。 相似文献
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本文提出的是一种基于平面型EBG (Electromagnetic Bandgap)结构的创新型结构,对于同步开关噪声(Simultaneous Switching Noise, SSN)的抑制有更优秀的特性。我们设计的这款新型EBG结构,是在周期性L-bridge EBG结构的基础上,在一些单元内插小型的L-bridge EBG。通过仿真验证,此结构具有传统型L-bridge EBG结构所不具有的超带宽抑制能力和较大的抑制深度。然后我们运用电路模型和平行板谐振腔原理分析了该结构上下变频。另外,通过3-D仿真,得到结构的IR-Drop和直流阻抗。最后,通过眼图验证该结构的信号传输特性。 相似文献
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目前,数字集成电路朝着高功率,低电压的方向发展,电源地平面上的同步开关噪声成为高速设计的主要瓶颈之一。文章阐述了同步开关噪声的形成原理和产生问题,详细分析了现有抑制SSN的主要方法,最后通过结构图和仿真效果图重点介绍电磁带隙结构(EBG)的设计方法、研究思路和最新发展趋势.为今后的实际应用研究提供一定的参考指导。 相似文献
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Electromagnetic interference (EMI) reduction from printed circuit boards (PCB) using electromagnetic bandgap structures 总被引:3,自引:0,他引:3
As digital circuits become faster and more powerful, direct radiation from the power bus of their printed circuit boards (PCB) becomes a major concern for electromagnetic compatibility engineers. In such multilayer PCBs, the power and ground planes act as radiating microstrip patch antennas, where radiation is caused by fringing electric fields at board edges. In this paper, we introduce an effective method for suppressing PCB radiation from their power bus over an ultrawide range of frequencies by using metallo-dielectric electromagnetic band-gap structures. More specifically, this study focuses on the suppression of radiation from parallel-plate bus structures in high-speed PCBs caused by switching noise, such as simultaneous switching noise, also known as Delta-I noise or ground bounce. This noise consists of unwanted voltage fluctuations on the power bus of a PCB due to resonance of the parallel-plate waveguiding system created by the power bus planes. The techniques introduced here are not limited to the suppression of switching noise and can be extended to any wave propagation between the plates of the power bus. Laboratory PCB prototypes were fabricated and tested revealing appreciable suppression of radiated noise over specific frequency bands of interest, thus, testifying to the effectiveness of this concept. 相似文献
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Ramahi O.M. Subramanian V. Archambeault B. 《Advanced Packaging, IEEE Transactions on》2003,26(2):191-198
Simultaneous switching noise (SSN) compromises the integrity of the power distribution structure on multilayer printed circuit boards (PCB). Several methods have been used to investigate SSN. These methods ranged from simple lumped circuit models to full-wave (dynamic) three-dimensional Maxwell equations simulators. In this work, we present an efficient and simple finite-difference frequency-domain (FDFD) based algorithm that can simulate, with high accuracy, the capacity of a PCB board to introduce SSN. The FDFD code developed here also allows for simulation of real-world decoupling capacitors that are typically used to mitigate SSN effects at sub 1 GHz frequencies. Furthermore, the algorithm is capable of including lumped circuit elements having user-specified complex impedance. Numerical results are presented for several test boards and packages, with and without decoupling capacitors. Validation of the FDFD code is demonstrated through comparison with other algorithms and laboratory measurements. 相似文献
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《Advanced Packaging, IEEE Transactions on》2008,31(3):544-557
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Simultaneous switching noise mitigation in PCB using cascaded high-impedance surfaces 总被引:1,自引:0,他引:1
A novel concept for ultra-wide-bandwidth suppression of simultaneous switching noise (SSN) in high-speed printed circuit boards (PCBs) is proposed and implemented. This method consists of cascading high-impedance surfaces (HIS) with different stop bands, creating rejection over a wide frequency region. A PCB with the cascaded HIS design has been successfully fabricated and tested. 相似文献
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Nanju Na Jinwoo Choi Swaminathan M. Libous J.R. O'Connor D.P. 《Advanced Packaging, IEEE Transactions on》2002,25(1):4-11
This paper presents simulation and analysis of core switching noise for a CMOS ASIC test vehicle. The test vehicle consists of a ceramic ball grid array (CBGA) package on a printed circuit board (PCB). The entire test vehicle has been modeled by accounting for all the plane resonances using the cavity resonator method. The models included both the on-chip and off-chip decoupling capacitors. Using both time domain and frequency domain simulations, the role of plane resonances on power supply noise for fast current edge rates has been discussed. The models have been constructed to amplify certain parts of the test vehicle during simulations 相似文献