超深亚微米工艺下预防串扰方法

随着工艺特征尺寸的不断缩小,芯片的信号完整性问题逐渐恶化。根据超深亚微米(ultra-deep submicron,UDSM)工艺特性,阐述了串扰噪声和同步开关噪声(Simultaneous Switch Noise,SSN)的产生机理以及对芯片信号完整性的影响,并且分析了走线密度、时钟频率和供电布局等与这2类噪声强度相关的主要因素,进而得出了在集成电路版图设计早期,有效预防和抑制信号完整性问题的一系列方法。     

Groups with Certain Normality Conditions

We classify two types of finite groups with certain normality conditions, namely SSN groups and groups with all noncyclic subgroups normal. These conditions are key ingredients in the study of the multiplicative Jordan decomposition problem for group rings.     

基于三种尺寸L-Bridge单元的超宽带电磁带隙结构

通过把3 种不同尺寸的L-bridge 单元进行组合,在多层PCB 板的电源层上,设计了一种新的多周期平面型超宽带电磁带隙(Electromagnetic Band Gap, EBG)结构,可用于抑制数字电路系统中的同步开关噪声(Simultaneous Switching Noise, SSN)。利用HFSS 软件对该EBG 结构进行了建模和仿真,并在仿真基础上制作了电路实物,实测与仿真结果吻合良好。组合结构EBG 比传统L-bridge EBG 的阻带宽度有明显提高,当抑制深度为-40 dB 时,具有从0.8 GHz 到9.5 GHz 的超宽带阻带特性。     

高速集成电路系统中同步开关噪声分析

文章首次利用部分元等效电路(PEEC)方法分析高速集成电路系统中同步开关噪声。该方法与其它等效电路方法及全波分析方法相比,简单、效率高,并可以和无源电路阶数缩减方法结合,进行大规模缩减,从而进一步提高计算速度。通过分析电路中两种典型结构体(电源／接地板,电源板／信号线／接地板)未加去耦电容和加上去耦电容后同步开关噪声,表明这种方法具有高效性。     

高速高密度PCB上的SSN问题

在现代数字产品中,IC性能越来越高,数据率越来越高,信号上升时间越来越短,SSN逐渐成为影响产品性能的重要因素之一.该文从高速高密度PCB设计的角度,探讨了高速高密度PCB上.SSN的机理与特性.结果表明,SSN是数字IC 固有的,有叠加性,是宽带噪声源;可引起地弹和电源反弹、产生传导骚扰和辐射骚扰、引起串扰噪声.该文...     

EBG combined isolation slots with a bridge on the ground for noise suppression

In this paper, a coplanar electromagnetic bandgap (EBG) structure is presented to realise with L-bridge unit cell on the power plane that is combined isolation slots with straight/meander-bridge on the ground plane. The proposed structure with meander-bridge on the ground plane possesses an ultra-wide band gap from 0.22 GHz to 20 GHz with isolation below ?30 dB, which is remarkable better than traditional EBG. The lumped equivalent-circuit model for the structure is presented and analysed to explain the mechanism of the improvement of noise suppression. The cut-off frequency for the proposed structure is obtained by theoretical analysis. It is shown that the increase of equivalent inductance of the bridge influences the cut-off frequency. The meander-bridge on the ground plane is adopted to broaden the stopband and significantly enhance the suppression depth. The validity of the presented structure is verified by the simulation compared to the measurement.     

Partial EBG Structure with DeCap for Ultra‐wideband Suppression of Simultaneous Switching Noise in a High‐Speed System

To supply a power distribution network with stable power in a high‐speed mixed mode system, simultaneous switching noise caused at the multilayer PCB and package structures needs to be sufficiently suppressed. The uniplanar compact electromagnetic bandgap (UC‐EBG) structure is well known as a promising solution to suppress the power noise and isolate noise‐sensitive analog/RF circuits from a noisy digital circuit. However, a typical UC‐EBG structure has several severe problems, such as a limitation in the stop band's lower cutoff frequency and signal quality degradation. To make up for the defects of a conventional EBG structure, a partially located EBG structure with decoupling capacitors is proposed in this paper as a means of both suppressing the power noise propagation and minimizing the effects of the perforated reference plane on the signal quality. The proposed structure is validated and investigated through simulation and measurement in both frequency and time domains.     

一种适用于高速电路中SSN抑制的紧凑型电磁带隙新结构

该文根据电磁带隙(EBG)结构的带隙形成机理以及共面EBG结构的等效电路,提出了一种适用于高速电路中同步开关噪声(SSN)抑制的紧凑型EBG结构,使用Ansoft HFSS对该结构进行仿真分析。仿真结果表明在抑制深度为-30 dB时,阻带范围为0.6-6.4 GHz,阻带带宽为5.8 GHz,与传统的L-bridge结构相比,阻带带宽增加了1.8 GHz,相对带宽增加了45%,实现了较低的带隙中心频率以及较宽的阻带带宽,并用Ansoft Designer通过时域仿真验证该结构具有较好的信号完整性。     

高速印刷电路板中电磁带隙结构的同步开关噪声抑制和传输特性分析

该文从频域和时域两方面对一种正六边形贴片的电磁带隙(EBG)结构进行了特性分析和研究。利用等效电路理论分析和研究了贴片边长、贴片间距和过孔半径对该结构的带隙和传输特性的各自不同的影响,得到并验证了准确估算不同贴片边长带隙的上、下限频率和带宽的数学表达式。研究表明可以通过贴片间距来改变带宽,但不影响带隙左侧特性,过孔半径的缩小会导致带隙左移并变窄。最终分析了以EBG结构为返回路径的信号线的时域特性,实验证明EBG结构的周期越小,信号的传输质量越差。     

一种抑制同步开关噪声的新颖电磁带隙结构

电源平面与接地平面间的同步开关噪声是现代高速、高性能数字电路应用的瓶颈之一。文中提出了一种应用于印刷电路板的新颖二维电磁带隙（MS-EBG）结构,其单位晶格由折线缝隙组合与正方形贴片桥接构成,以抑制同步开关噪声。结果表明,抑制深度为-30 dB时,与传统L-bridged EBG结构比较,新EBG结构的阻带宽度增加1.3 GHz,相对带宽提高了约10%,能够有效抑制0.6～5.9 GHz的同步开关噪声。