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基于DDR3系统互联的信号完整性设计 被引量:15
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作者 张超 余综 《计算机工程与设计》 CSCD 北大核心 2013年第2期616-622,共7页
针对DDR3系统互联中信号完整性和时序等问题,以某自研的自主可控计算设备为背景,详细描述了龙芯3A处理器和四片DDR3内存颗粒芯片互联的仿真分析和优化设计方案。分析了IBIS模型的结构和数据信息,介绍了一种快速验证IBIS模型准确性的方... 针对DDR3系统互联中信号完整性和时序等问题,以某自研的自主可控计算设备为背景,详细描述了龙芯3A处理器和四片DDR3内存颗粒芯片互联的仿真分析和优化设计方案。分析了IBIS模型的结构和数据信息,介绍了一种快速验证IBIS模型准确性的方案。仿真分析了一种DDR3差分时钟电路共模噪声的控制方法。利用前仿真和后仿真,分析验证了多片DDR3内存颗粒芯片在Fly-By拓扑结构下的时序和信号质量。仿真结果达到了预期目标。 展开更多
关键词 DDR3 信号完整性 IBIS模型 差分信号 fly-by拓扑 HyperLynx仿真
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DDR拓扑分析
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作者 沙卓烜 《电子技术与软件工程》 2015年第17期29-30,共2页
随着计算机技术的的迅猛发展,DDR的技术也得到了广泛的应用,从而由于PCB板设计时因拓扑结构的使用不当,因而往往严重导致信号完整性产生的问题造成困惑,本文通过hyper Lynx仿真软件来进行多种拓扑结构比对,具体分析拓扑结构中各个分支... 随着计算机技术的的迅猛发展,DDR的技术也得到了广泛的应用,从而由于PCB板设计时因拓扑结构的使用不当,因而往往严重导致信号完整性产生的问题造成困惑,本文通过hyper Lynx仿真软件来进行多种拓扑结构比对,具体分析拓扑结构中各个分支长度以及对匹配电阻位置对信号的所造成的影响,为最初的pcb拓扑方式作出相应的指导,以减少困惑,节省时间。 展开更多
关键词 DDR 拓扑 fly-by T结构
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The Physics behind the NASA Flyby Anomaly
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作者 Richard A. Hutchin 《Optics and Photonics Journal》 2022年第3期31-51,共21页
From 1990 to 2005 NASA did six flybys of Earth in order to boost the energy of each spacecraft, enabling them to go deeper into the solar system. These six flybys showed an unexpected violation in the conservation of ... From 1990 to 2005 NASA did six flybys of Earth in order to boost the energy of each spacecraft, enabling them to go deeper into the solar system. These six flybys showed an unexpected violation in the conservation of energy of up to 100 sigmas, matching a simple physical formula related to the input and output spacecraft velocities relative to the Earth rotational plane. Mysteriously, occasionally the effect was not present. After several years of reviewing the data and evaluating all sources of perturbation known to NASA, no solution was identified. NASA sent the final report to the author above for further review. Independently, the author’s firm Optical Physics Company had published research into the vacuum field, finding that it was not constant but varied across the Earth’s orbit and was also separately detected being radiated by the Sun. The physics we had learned was applied to the NASA passes, allowing all the anomalies they had encountered to be explained and adding considerably to our understanding of the vacuum field. We hypothesized a radially emitted vacuum field (which controls the rate of time) would couple the radial direction r with time t to add a gtr term in the metric tensor. We then combined the previously published experimental data of the vacuum field radiated by the Sun with the NASA data to develop a formula for the emission of the vacuum field from warm rotating bodies, accurate to about 1%. 25 candidate formulas were evaluated, based on powers of radial acceleration and temperature, and one was definitively selected. This research offers a linkage between the vacuum field whose spectrum is proportional to h and an effect on the metric tensor of gravity. Since both gravity and h control time rates, it seemed credible they could both affect the metric tensor. 展开更多
关键词 NASA fly-by Non-Conservation of Energy General Relativity Vacuum Field Planck’s Constant
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