共查询到18条相似文献，搜索用时 142 毫秒
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基于HyperLynx的PCB电路信号串扰分析与仿真 总被引：1，自引：0，他引：1
串扰是信号完整性的一个重要内容,在高速电路设计中是不可忽视的。借助Mentor Graphics公司的信号完整性分析工具HyperLynx仿真软件,对PCB板中造成信号串扰的多种因素进行分析。为了使串扰达到最大化,更接近实际,采用三线系统对串扰进行全面的分析。最后根据仿真结果,提出了减小串扰的有效措施。 相似文献
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梁晓琳 《湖南科技学院学报》2010,31(4):53-54,27
串扰噪声已成为在深亚米工艺下造成电路功能错误的一个主要原因,对串扰时延测试已成为一个迫切的问题。利用FAN算法完成串扰时延故障的测试矢量生成,并且利用其多路回退和回溯等主要特色,来提高测试生成算法的效率。 相似文献
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耿俊 《北京工业职业技术学院学报》2012,11(3):40-42
在电子产品设计的高速化和小型化时代,如何抑制传输信号的串扰,使其降低到最低,这是每一位高速电路PCB设计者,所要追求的目标。本文通过对影响传输信号串扰因素的分析,结合多年高速电路PCB设计的经验,对抑制信号串扰的方法做了比较详尽的表述。为高速电路PCB设计人员提供一些经验,使得在高速电路PCB设计中少走弯路。 相似文献
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在电路板的设计过程中,信号频率的提高必然会引起包括串扰在内的各种信号完整性问题。简要剖析在高速PCB板设计中信号串扰的产生原因,并提出了相应的解决方案。 相似文献
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李新 《中国教育技术装备》2009,(15)
介绍基带和频带传输系统中常见码间串扰问题消除方法,通过理论分析,比较两种传输系统无码间串扰时的频带利用率,以便学生对频带利用率的正确理解和求解此类问题时简化运算。 相似文献
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通过对数字基带信号传输码间串扰产生的分析认为基带信号传输受约束因素是系统频率特性,在奈奎斯特准则的基础上,引入无码间串扰的数字基带信号矩形传输系统并优化出系列研究结论。 相似文献
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为适应高速PCB更新快、设计周期短的特点,本文对PCB设计中的串扰问题的分析引入了快速、高效的仿真分析法并提出了克服串扰的措施,本文对现代高速电路理论的分析有一定的参考价值. 相似文献
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阵列波导光栅孔径大小是AWG复用/解复用器件的重要结构参数.大部分耦合进对应输出波导的同时有部分光场耦合进邻近波导,增加了器件的串扰.本文分析了波导光栅孔径有限引起的信号串扰. 相似文献
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信号完整性的噪声问题可归结为以下四类问题:反射,串扰,地弹和EMI。本文对引起信号完整性问题的端接匹配和串扰两个方面进行了初步的分析和研究,分别给出了一些改善的简单方法。 相似文献
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秦光仁 《安阳师范学院学报》2007,(5):6-7
从参数估计的角度,讨论了基于排序集抽样的Bayes估计,并进一步与传统的Bayes估计相比较,从估计的相对效率角度说明了基于排序集抽样的Bayes估计的优良性。 相似文献
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Effectiveness of student response systems in terms of learning environment,attitudes and achievement
In order to investigate the effectiveness of using Student Response Systems (SRS) among grade 7 and 8 science students in New York, the How Do You Feel About This Class? (HDYFATC) questionnaire was administered to 1097 students (532 students did use SRS and 565 students who did not use SRS). Data analyses attested to the sound factorial validity and internal consistency reliability of the HDYFATC, as well as its ability to differentiate between the perceptions of students in different classrooms. Very large differences between users and non-users of SRS, ranging from 1.17 to 2.45 standard deviations for various learning environment scales, attitudes and achievement, supported the efficacy of using SRS. 相似文献
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Lee Sze Kho 《Interactive Learning Environments》2017,25(8):996-1008
Student response systems (SRSs) are wireless answering devices that enable students to provide simple real-time feedback to instructors. This study aims to evaluate the effects of different SRS interaction modes on elementary school students’ science learning. Three interaction modes which include SRS Individual, SRS Collaborative, and Classroom were examined. A pretest–posttest quasi-experimental design was used to compare the effects of the three interaction modes on science posttest scores for higher order thinking (HOT) questions as well as lower order thinking questions. The results show that SRS Collaborative mode has significant positive effects on science posttest scores of HOT questions. This study points to the potential benefits of using SRS, particularly for collaborative tasks, to solve problems that require HOT skills. 相似文献
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相声是语言的表演艺术,是以笑作为艺术的手段。相声又是一种极为独特的民间文学样式,最大的特点就是在奇巧的构思之中,使听众们获得了轻松、愉悦的感受。那么,究竟是怎样的一种构思能够达到这样的效果呢？答案便是相声中的“包袱”,而“包袱”同时也是引导观众产生愉悦感受的重要载体,研究相声“包袱”的特点对于把握相声语言、深入理解相声这一独具特色的民间文学样式有着至关重要的作用。这对于挖掘中国传统相声艺术遗产,继承并弘扬传统民间艺术都有着核心作用。 相似文献
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CAROL GATTIS HEATHER NACHTMANN ALISHA YOUNGBLOOD 《European Journal of Engineering Education》2003,28(1):71-82
The students-recruiting-students (SRS) programme is an outreach programme developed to recruit high school students into the Industrial Engineering Department at the University of Arkansas. The four phases of this programme from development to on-campus, off-campus and post-admission recruiting are detailed in this paper along with 7 years of programmatic results. The goals of this paper are to introduce the SRS concept, encourage successful development of similar recruiting programmes and increase freshman enrolment in engineering. The SRS programme has more than doubled the department's freshman enrolment over the last 8 years. 相似文献
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ABSTRACTFlipped classes are well-known for reversing the typical in-class lecture and out-of-class homework structure by instructing students to learn by themselves from on-line learning materials and inviting them to ask questions based on their individual difficulties in class. Many attempts at integrating this teaching method into English as a foreign language (EFL) classrooms have proven to be beneficial to students’ learning achievement and motivation. However, there is little research on how to organize interactive, engaging and effective in-class activities for an EFL flipped classroom. In this study, a student response system (SRS) is proposed to support teachers in organizing in-class activities in a flipped class. To investigate the effectiveness of this approach, a quasi-experiment was conducted in an EFL classroom in an engineering school. The experimental group used the SRS to do in-class activities while the control group followed the conventional method. The results showed that the use of the SRS increased students’ learning motivation and self-efficacy in learning English grammar and improved their participation and engagement in the in-class activities of the flipped learning process. Furthermore, the questionnaire results showed that students accepted the SRS as an instructional method in an EFL flipped class. However, the use of the SRS was not effective in improving students’ grammar learning achievement. 相似文献
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In this paper, we propose a technique for lowering the latency of the communication in a NoC （network on chip）. The technique, which can support two qualities of service （QoS）, i.e., the guaranteed throughput （GT） and best effort （BE）, is based on splitting a wider link into narrower links to increase throughput and decrease latency in the NoC. In addition, to ease the synchronization and reduce the crosstalk, we use the l-of-4 encoding for the smaller buses. The use of the encoding in the proposed NoC architecture considerably lowers the latency for both BE and GT packets. In addition, the bandwidth is increased while the power consumption of the links is reduced. 相似文献
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学生的发展是高校一切工作开展的中心,学生的质量是高校永恒的主题。提升高校办学质量关键是要践行"生本理念"。嘉应学院在改善与提升自身办学质量的过程中,探索出"学生代表座谈会"制度,以推动师生平等对话,从而畅通学校与学生沟通的渠道,增强学生的权益意识和归属感。实践证明,"学生代表座谈会制度"日益彰显其育人功能及提升办学质量和人才培养质量的"润滑剂"作用。 相似文献