降低耦合微带线间串扰问题--FDTD分析

考虑耦合微带线结构的远端串扰问题,用FDTD方法对不同结构的耦合微带线(普通耦合微带线,上方覆盖一层电介质层的耦合微带线,有封装结构的耦合微带线)进行了全波分析后得出结论：在耦合微带线上方覆盖一层电介质层,能降低其远端串扰。     

考虑串扰影响的时延测试

超深亚微米工艺下，串扰的出现会导致在电路设计验证、测试阶段出现严重的问题。本文介绍了一个基于波形敏化的串扰时延故障测试生成算法。该算法以临界通路上的串扰时延故障为目标故障进行测试产生．大大提高了算法的效率。实验表明，以该算法实现的系统可以在一个可接受的时间内。对一定规模的电路的串扰时延故障进行测试产生。     

基于AWG实现OADM实验研究

设计了基于位相波导光栅（AWG）的复用和解复用双重功能的两种OADM网元实现方案,分析并实验研究了两种OADM网元的串扰特性。结果表明,采用一定结构设计的OADM网元可以较好地减小串扰影响。     

开关电源印刷电路板电磁兼容问题的研究

印刷线路间的串扰问题是影响开关电源传导干扰水平的主要因素之一,而旨在降低串扰水平的布线设计却一直是设计中难点。本文提出了一种基于电场分析的开关电源印刷电路板EMC辅助设计的思想方法,其基本思想是以干扰强度分布图为参考选择布线区域,以耦合系数的实时计算结果为指导及时调整布线设计,帮助工程师在印刷线路板的设计阶段就把潜在的干扰抑制在尽可能低的水平上。计算和实验的结果证实了这种思想的可行性。     

Waveguide Filter for Reducing Crosstalk in All Optical Networks

A novel filter structure which can reduce the crosstalk in cross-connection and switching in all optical networks based on dense wavelength division multiplexing(DWDM) is presented.The filter is constructed by dielectric waveguide with the waveguide boundary or the waveguide itself uncontinuous in transmitting direction.Using the concept of effective refractive index of plane waveguide system, we can get a special index profile along the wave propagation direction by alternatively changing the thickness of waveguide film or its refractive index.Having proved this kind of waveguides with filtering properties, the design principle of an example is given, which will be very useful to reduce the crosstalk in optical cross-connection and switching in all optical networks based on DWDM. This kind of filters can be easily connected with other related component.     

高性能价格比的1×7混合棒塑料光纤耦合器的研究

提出了使用圆柱形混合棒的 1× 7塑料光纤耦合器 ,它直接使用粗塑料光纤制作混合棒 ,省略了加工难度大、成本高的混合棒拉锥过程 ,因而生产成本较低 ,但也带来了结构性的通道串音。研究了混合棒失配面外接U形光纤光吸收器以降低结构性通道串音的方法 ,制作了实验样品并进行了性能测量。测量结果表明 ,该耦合器的通道串音 <- 4 0dB ,其耦合效率与 1× 7圆锥形混合棒塑料光纤耦合器相同 ,附加损耗可以降至 1.7dB以下 ,该耦合器是一种高性能价格比的塑料光纤耦合器     

数字电路封装的串扰测试方法研究

梳理了数字电路封装串扰测试方法的发展历史，总结了串扰的影响因素。基于对业界串扰测试方法的分析，比较了各种方法间的区别和优缺点，分析了美军标MIL-STD-883K中串扰测试方法很少修订却长期存在的原因。明确了美军标及其他串扰测试方法的适用范围，提出了我国相应标准制修订方向的建议。测试结果表明，标准中的现有方法在评估串扰对整体电路影响方面手段有欠缺，需要结合电磁仿真对串扰影响做出整体评估，并利用实际测试对仿真结果进行校准，从而提高模拟的准确度，此方法可以在我国相应标准的制修订中加以采用。     

Hardness of crosstalk minimization in two-layer channel routing

Crosstalk minimization is one of the most important aspects of high-performance VLSI circuit design. With the advancement of fabrication technology, devices and interconnecting wires are being placed in close vicinity, and circuits are operating at higher frequencies. This results in crosstalk between adjacent wire segments. In this paper, it has been shown that the crosstalk minimization problem in the reserved two-layer Manhattan routing model is NP-complete, even if channels are free from all vertical constraints. It has also been demonstrated that it is hard to approximate the crosstalk minimization problem. Besides, the issue of minimizing bottleneck crosstalk has been introduced that is a new problem for crosstalk minimization. It has been proven that this problem is also NP-complete. It has been further shown that all these results hold even if doglegging is allowed.     

平行传输线间串扰的仿真及分析

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。     

Sophisticated mobile robot sonar sensing with pseudo-random codes

Conventional time-of-flight sonar sensing is widely used within the autonomous mobile robot research community. One of its most severe problems is known as crosstalk. This paper presents experimental results of a new approach which allows one to operate a set of sonar sensors simultaneously. Nevertheless, frequent misreadings caused by crosstalk or external ultrasound sources are eliminated. This is achieved by carefully designing the emitted bursts, i.e. by using appropriate pseudo-random sequences together with a matched filter receiver well known from radar applications.