高速印制电路板设计中的串扰问题和抑制

本文剖析了在高速PCB板级设计中信号完整性分析领域信号串扰的产生机制,并利用HyperLynx软件包仿真,结合工作中的实践,提出了相应的解决方案.     

基于优势效应理论的双绞线简化建模

在对双绞线电磁干扰进行研究中,一些学者建立了精确的干扰模型,但并不适合工程应用.本文根据电磁兼容优势效应理论,推导出双绞线传导干扰主要由差模电流引起,辐射干扰主要由共模电流引起.分别利用广义二端口网络模型和电流元分析方法建立双绞线串扰和辐射的简化模型,从而有效估算双绞线串扰电压和对外辐射场的大小,为工程人员采取有效措施抑制互连设备电磁干扰提供了理论帮助.     

A wireless multi-channel implantable neural recording microsystem based on optimized analog TDM-FDM combination

Crosstalk noise (CT) is a limiting factor to increase the number of channels in analog Time-Division-Multiplexing (TDM)-based Wireless Neural Recording microsystems (WNRs). This paper proposes a novel approach to mitigate and decrease the effect of the CT by combining TDM with Frequency-Division-Multiplexing (FDM). In particular, we evaluate some possible configurations of the TDM-FDM combination and present a system that has less CT than other configurations. A 12-channel WNR based on the proposed system is designed in both system and circuit-level. In this system, channels are first divided into three 4-channel groups and after multiplexing in time domain, they are combined together with FDM method. While the group containing the marker pulse is located in the base-band, the second and third group are shifted to the frequency domain by employing quadrature modulation. The circuit-level of the system is designed and simulated by using 0.18 μm CMOS technology. The designed circuit consumes a power of 1.4 mW at a supply voltage of 1.8 V. The performance of the proposed system is also compared with simple TDM-based WNR. Simulations shows that in the proposed system the CT is considerably decreased.     

Crosstalk noise modeling of multiwall carbon nanotube (MWCNT) interconnects using finite-difference time-domain (FDTD) technique

This paper presents an accurate and efficient model for the transient analysis of multiwall carbon nanotubes (MWCNT) using finite-difference time-domain (FDTD) method. The proposed model can be essentially used to analyze the functional and dynamic crosstalk effects of coupled-two MWCNT interconnect lines. Using the proposed model the voltage and current can be accurately estimated at any point on the interconnect line and furthermore, the model can be extended to coupled-n interconnect lines with a low computational cost. Crosstalk induced propagation delay, peak voltage, and its timing instance are measured using the proposed model and validated by comparing it to the HSPICE simulations. Over a random number of test cases it is observed that the average error in estimating the noise peak voltage on a victim line is less than 1%. The proposed model is extremely useful for accurate estimation of crosstalk induced performance parameters of MWCNT interconnects.     

VLSI设计规划中互连串扰的峰值估计

提出了一组新的基于RLC模型的VLSI互连串扰峰值估计公式.根据高速VLSI互连特性建立了混πRLC模型,推导出分量匹配法3阶系数的精确表达式,得到了只与R、L、C分布参数有关的互连线串扰峰值估计公式.计算实验表明,该公式与SPICE仿真结果符合得较好.将该估计公式嵌入各种综合引擎和工具,能够在高速、高密度、大规模集成电路的设计阶段预测信号性能.     

耦合微带线间串扰问题的FDTD法分析

在模拟和数字电路中,耦合微带线间的串扰会降低设备的性能。为了降低线间串扰,在攻击线两边各插入了一列用金属填充的、顶端用微带连接的接地孔。利用FDTD方法对该结构进行模拟,给出了接地孔的有效放置方法。     

电子设备互连电缆电磁兼容性预测与分析

电子设备互连电缆之间的电磁耦合是降低电子设备电磁兼容性的重要原因.本文在提出电子设备互连电缆间的电磁耦合模型的基础上,利用场路结合的方法对电子设备互连电缆进行了电磁耦合预测分析.数值分析结果对最终实现电子设备的电磁兼容性有重要的指导意义.     

高速PCB串扰分析及其最小化

技术进步带来设计的挑战,在高速、高密度PCB设计中,串扰问题日益突出。本文就串扰原理和对信号完整性影响进行分析,并在此基础上提出了高速PCB设计中串扰最小化的方法。     

Sensitivity and crosstalk study of the zero gap microlens used in 3.2 μm active pixel image sensors

The microlens has been widely applied to improve the sensitivity and to decrease the spatial crosstalk of image sensors. In order to further decrease the pixel size while improve the image quality, the zero gap microlens has been proposed to make high performance image sensors. In this paper, both the traditional microlens and zero gap microlens are fabricated using TOWER and TOPPAN processes. And their performances are compared and evaluated. The results show that the least sensitivity of the zero gap microlens has been significantly improved by more than 45.8% compared to that of the traditional microlens. The use of the zero gap microlens results in an obvious decrease of the crosstalk among blue, green and red lights. For example, the crosstalk of blue light in red light under the green irradiation has been decreases about 1.33%, and the crosstalk of red light in blue light under the blue irradiation has showed about 2.429 times decrease. Overall, the output colour image of the zero gap microlens is brighter and clearer than that of the traditional microlens. Image quality has been significantly improved due to the use of the zero gap microlens.     

A non-iterative continuous model for switching window computation with crosstalk noise

Proper modeling of switching windows leads to a better estimate of the noise-induced delay variations. In this paper, we propose a new non-iterative continuous switching model. The proposed new model employs an ordering technique combined with the principle of superposition of linear circuits. The principle of superposition considers the impact of aggressors one after the other. The ordering technique avoids convergence and multiple solution issues in many practical cases. Our model surpasses the accuracy of the traditional discrete model and the speed of fixed point iteration method.