光刻投影物镜中动镜X-Y向柔性调节机构设计

针对光刻投影物镜中动镜X-Y向调节机构精度高、行程小、结构紧凑的需求,提出了一种X-Y向一体式调节机构.所提机构基于四连杆调节原理,利用内外圈独立分布的X-Y向柔性铰链,无需解耦即可实现X/Y向高精度调节.首先根据投影物镜中动镜的调节精度和行程,完成所提机构的结构设计;然后运用有限元分析法仿真分析所提X-Y向柔性调节机...     

L波段8通道宽带数字T/R组件技术

研究了一种L波段8通道宽带数字T/R组件设计技术.组件具有瞬时带宽宽和发射功率大的特点,可以产生带宽为100 MHz的线性调频信号(LFM),单通道输出功率可达50 W.该组件集成了8个独立的收发通道,上下变频都采用一次变频,简化了电路设计,控制组件的体积、重量和成本,取得了良好的效果.通过对研制样件的测试,设计性能达到要求,其通道间相位长期稳定性即同频点相位差RMS达到发射小于2.5°,接收小于0.7°的指标.利用2个样件构建了16单元数字线阵试验平台,给出了发射和接收方向图.     

FCG延时控制系统的改进

延时控制系统是爆磁压缩发生器的关键技术之一。增强延时控制系统绝缘性和提高延时控制精度能有效提升爆磁压缩发生器输出性能。本文介绍了两种通用延时控制系统的工作原理,分析了其优缺点。在理论和试验的基础上,结合两种延时控制系统优点,设计了一种同轴式同步开关,提出了符合爆磁压缩发生器应用要求的延时控制系统。试验表明,改进延时控制系统能满足爆磁压缩发生器的工作要求。     

应用集中部署的企业数据中心与分支机构网络构建研究

应用集中部署的企业需要可用性、安全性更高的网络作为业务的支撑。文章从数据中心与分支机构组网的网络基础架构设计至网络安全性设计、网络高效性设计及网络可靠性设计,给出较完整的网络设计思路和方法。     

Trellis‐Based Decoding of High‐Dimensional Block Turbo Codes

This paper introduces an efficient iterative decoding method for high‐dimensional block turbo codes. To improve the decoding performance, we modified the soft decision Viterbi decoding algorithm, which is a trellis‐based method. The iteration number can be significantly reduced in the soft output decoding process by applying multiple usage of extrinsic reliability information from all available axes and appropriately normalizing them. Our simulation results reveal that the proposed decoding process needs only about 30% of the iterations required to obtain the same performance with the conventional method at a bit error rate range of 10^?5 to 10^?6.     

A Fully Integrated Thin‐Film Inductor and Its Application to a DC‐DC Converter

This paper presents a simple process to integrate thin‐film inductors with a bottom NiFe magnetic core. NiFe thin films with a thickness of 2 to 3 μm were deposited by sputtering. A polyimide buffer layer and shadow mask were used to relax the stress of the NiFe films. The fabricated double spiral thin‐film inductor showed an inductance of 0.49 μH and a Q factor of 4.8 at 8 MHz. The DC‐DC converter with the monolithically integrated thin‐film inductor showed comparable performances to those with sandwiched magnetic layers. We simplified the integration process by eliminating the planarization process for the top magnetic core. The efficiency of the DC‐DC converter with the monolithic thin‐film inductor was 72% when the input voltage and output voltage were 3.5 V and 6 V, respectively, at an operating frequency of 8 MHz.     

An Efficient Paging Strategy Based on Paging Agents of Base Stations in Cellular Mobile Networks

We propose a new paging strategy to reduce paging cost by adding paging agents at base stations. When a mobile‐terminated call occurs, the base stations look up the paging agents to determine if terminal paging is actually to be made. An analytical model based on a Markov chain is used to evaluate the performance of the proposed strategy. The numerical results show that the proposed strategy significantly reduces the paging cost compared with the simultaneous paging strategy.     

一种适合承载IPTV多播业务的新型EPON扩展网络架构

本文提出一种新型的EPON扩展网络架构,通过在原有OLT和ONU设备之间新增加一条无源光网络PON通道,该PON通道用于单独承载IP多播数据流,原PON通道仍可正常承载其他IP数据流。使得EPON网络在承载IPTV业务时,既能够保证实时多播业务质量要求又能够保证单播业务的带宽要求。本文同时描述了这种双PON通道的EPON扩展网络架构实现方法以及对支持双PON接口ONU的管理方式。