基于PXI总线的电子设备生产测试系统设计

以PXI总线技术为基础,建立电子设备生产测试系统,针对不同的电子设备,测试需求也会不同,因此本系统需要有良好的开放性和可扩展性。本文以电子设备生产测试系统为例,设计出基于PXI总线的检测装备,重点论述了软硬件设计方法,通过对标准接口的应用,实现了系统的综合设计。     

飞行控制组件半实物仿真系统的研究与应用

PXI是基于PC的一种小型化测试平台,主要应用于控制及测试,使用PXI接口方式使设备具有一定的先进性,其技术相对成熟,开发相对容易,同时又能满足使用要求.该文介绍了基于PXI总线的一台性价比高、功能全面、实用性强、通用性好的飞行控制组件半实物仿真系统.     

26.5GHz PXI综合测试仪

NI与BAE Systems公司、PhaseMatrix公司共同发布了一款针对军事和商业射频／微波应用的、基于PXI平台的26．5GHz综合测试仪。这款综合测试仪通过整合模块化硬件与平台软件来创建用户自定义的测试测量系统。新款综合测试仪是以5个兼容3U PXI Express的射频／微波下变频模块为基础而设计的,它拥有从100kHz～26．5GHz的频率操作范围。该产品同时使用了NI公司的PXIe机箱、控制器和中频（IF）数字化仪模块。另外,它支持主机端的LabVIEW图形化开发和硬件FPGA数字信号处理。     

基于PXI总线技术的导弹通用检测平台设计

采用PXI总线技术,集便携式工控机、PXI卡式仪器I、EEE488程控仪器、程控电源于一体,以Windows 2000为操作开发平台研制一种导弹通用检测平台。NI公司的Measurement Studio和数据库管理系统作为系统应用软件的开发平台。该系统可靠性高,可以满足多种不同型号导弹装备的测试、诊断和维修的需要。系统具有良好的稳定性和可扩展性,可完成多种不同导弹武器装备在复杂环境下的测试需要。     

基于PXI 总线的测控雷达发射机自动化测试系统设计

叙述PXI 总线虚拟仪器的特点和应用领域。分析了测控类雷达发射机对自动化测试系统的需求以及基于PXI 总线虚拟仪器测试系统对于测控类雷达发射机指标测试需求的满足程度。提出了基于PXI 总线的虚拟仪器理念构建测控雷达发射机自动化测试系统的设计方法,并介绍了无法直接测试指标的软件计算方法。最后,举例说明实际应用产品的使用效果,以及自动化测试系统的意义。     

多通道PXI总线数据采集系统设计

本文主要针对导弹测试系统中多通道数据采集的任务,提出了基于FPGA平台的PXI总线接口通用设计方案,并实现了PXI总线接口模块的电路设计和驱动程序的开发。然后根据PXI总线体系的要求,完成了32通道数据采集系统硬件设计和仪器软面板设计。该方案的成功实现对于组建自定义的总线化测试系统具有十分重要的意义,标志着自主化的PXI总线接口关键技术的突破。     

基于虚拟仪器研制的综合性能检测系统

文章介绍了采用NI公司Multimeter卡、Switch卡及DI/DO采集卡,配以各种接近开关、磁性传感器、电磁阀、测漏仪、温控仪、按钮、开关、指示灯及可控稳压源等开发的一个性能可靠、性价比高和柔性灵活的以PXI为构架、基于虚拟仪器技术的油泵支架综合性能测试系统。     

基于PXI的虚拟测试系统教学实验平台

为加强和改进测控技术与仪器专业的专业课程实验教学，提高实验教学水平，利用PXI总线仪器和高效的Labview图形化虚拟仪器编程语言，开发了基于PXI的虚拟测试系统教学实验平台。阐述了基于PX泊测试系统实验平台的基本组成、实现方法，介绍了测试系统教学实验平台的功能，并对该实验平台的改进和扩展提出了一些构思。     

虚拟仪器技术及其发展趋势（续）

PXI这种新型模块化仪器系统是在PCI总线内核技术上增加了成熟的技术规范和要求形成的。它通过增加用于多板同步的触发总线和参考时钟、用于进行精确定时的星形触发总线、以及用于相邻模块间高速通讯的局部总线来满足试验和测量用户的要求。PXI规范在Compact PCI机械规范中增加了环境测试和主动冷却要求以保证多厂商产品的互操作性和系统的易集成性。PXI将Microsoft Windows定义为其标准软件框架，并要求所有的仪器模块都必须带有按VISA规范编写的WIN32设备驱动程序，使PXI成为一种系统级规范（见图6），保证系统的易于集成与使用，从而进一步降低最终用户的开发费用。     

多通道RXI总线数据采集系统设计

本文主要针对导弹测试系统中多通道数据采集的任务,提出了基于FPGA平台的PXI总线接口通用设计方案,并实现了PXI总线接口模块的电路设计和驱动程序的开发.然后根据PXI总线体系的要求,完成了32通道数据采集系统硬件设计和仪器软面板设计.该方案的成功实现对于组建自定义的总线化测试系统具有十分重要的意义,标志着自主化的PXI总线接口关键技术的突破.     

聚对苯撑苯并双(口恶)唑发光及其器件制备

采用光谱技术,研究了聚对苯撑苯并双(口恶)唑(PBO)溶液的光敏发光特性,并用相对法估算出溶液发光效率在50%范围.结合光谱技术、半导体电学和电化学等研究手段,具体研究了以PBO为发光层的单层电致发光器件,研究结果显示,电致发光与薄膜的光致发光有具有相同的发光中心,峰值位于510 nm左右.同时发现,由于存制备过程中不同处理条件使得不同厚度薄膜残留的掺杂物质浓度不同,从而引起薄膜的导电性的不同.使得器件的阈值场强随PBO厚度的减小而逐渐增加.     

系统级封装新型埋入式电源滤波结构的研究

在高密度小尺寸的系统级封装(SiP)中,对供电系统的完整性要求越来越高,多芯片共用一个电源网路所产生的电压抖动除了会影响到芯片的正常工作,还会通过供电网路干扰到临近电路和其他敏感电路,导致芯片误动作,以及信号完整性和其他电磁干扰问题.这种电压抖动所占频带相当宽,几百MHz到几个GHz的中频电源噪声普通方法很难去除.结合埋入式电容和电源分割方法的特点,提出一种新型高性能埋入式电源低通滤波结构直接替代电源/地平面.研究表明,在0.65～4GHz的频带内隔离深度可达-40～75 dB,电源阻抗均在0.25ohm以下,实现了宽频高隔离度的高性能滤波作用.分别用电磁场和广义传输线两种仿真器模拟,高频等效电路模型分析这种低通滤波器的工作原理以及结构对隔离性能的影响,并进行了实验验证.     

Emerging interconnects: a state-of-the-art review and emerging solutions

Aluminium was a primary material for interconnection in integrated circuits (ICs) since their inception. Later, copper was introduced as interconnect material which has better metallic conductivity and resistance to electromigration. As the aggressive technology scaling continues, the copper resistivity increased because of size effects, which causes increase in delay, power dissipation and electromigration. The need to reduce the resistor-capacitor??????? delay, dynamic power utilisation and the crosstalk commotion is as of now the fundamental main impetus behind the presentation of new materials. The purpose of this paper is to do a survey of interconnect material used in IC from introduction of ICs to till date. This paper studies and reviews new materials available for interconnect application which are optical interconnects, carbon nanotube (CNT), graphene nanoribbons (GNRs) and silicon nanowires which are alternatives to copper. While doing a survey of interconnect material, it is found that multiwalled CNTs, multilayer GNR and mixed CNT bundles are promising candidates and are ultimate choice that can strongly address the problems faced by copper but on integration basis copper would last for coming years.     

Arsenic deposition as a precursor layer on silicon (211) and (311) surfaces

We investigate the properties of arsenic (As) covered Si(211) and Si(311) surfaces by analyzing data from x-ray photoelectron spectroscopy (XPS) and low-energy electron diffraction (LEED) images. We then create a model using total surface energy calculations. It was found that both Si(211) and Si(311) had 0.68±0.08 surface As coverage. Si(211) had 0.28±0.04 Te coverage and Si(311) had 0.24±0.04 Te coverage. The Si(211) surface replaces the terrace and trench Si atoms with As for a lower surface energy, while the Si edge atoms form dimers. The Si(311) surface replaces all terrace atoms and adsorbs an As dimer every other edge site. These configurations imply an improvement in the mean migration path from the bare silicon surface by allowing the impinging atoms for the next epitaxial layer, tellurium (Te), to bind at every other pair of edge atoms, and not the step terrace sites. This would ensure a nonpolar, B-face growth.     

光子晶体微腔发光二极管

光子晶体微腔因其具有增强自发辐射、定向输出和单模工作的能力而受到广泛关注。介绍了光子晶体微腔发光二极管的基本原理、设计、特性、制作及其典型器件。     

Comparative study of maximum power point tracking techniques for hybrid renewable energy system

The power generation demand is increasing day-by-day throughout the world, therefore, the use of hybrid systems becomes a significant solution. The hybrid renewable energy system (HRES) is used for delivering power in various regions in order to overcome intermittence of wind and solar resources. Because of increasing environmental problems, for example, greenhouse gas emission and energy cost have interested novel research into substitute methods in favour of electrical power generation. Maximum Power Point Tracking (MPPT) control method is a vast deal of novel research used for enhancing the efficiency of HRES. The authors have revealed that the hybrid techniques i.e. Global MPPT, fuzzy-neuro systems, Adaptive Neuro-Fuzzy Inference System (ANFIS), Perturbed and Observe (P&O) + Adaptive Neural Network (ANN) etc. can provide best results as compared to other MPPT control methods. This paper offering a state of art review of MPPT control techniques for HRES.     

用于单光子TOF测量的时间-幅度变换器

基于新型共源共栅电流源的积分方法,设计了一种用于单光子飞行时间(TOF)测量的时间-幅度变换器(TAC).该方法有效简化了 TAC电路结构,减小了 TAC占用面积,显著提高了TOF的满量程范围(FSR).采用0.18 μm标准CMOS工艺设计.集成TAC的单光子探测器像素单元的填充因子可达到26.8％.后仿真结果表明,...     

Joint estimation of TOA and DOA in IR-UWB system using a successive propagator method

Impulse radio ultra-wideband (IR-UWB) ranging and positioning require accurate estimation of time-of-arrival (TOA) and direction-of-arrival (DOA). With receiver of two antennas, both of the TOA and DOA parameters can be estimated via two-dimensional (2D) propagator method (PM), in which the 2D spectral peak searching, however, renders much higher computational complexity. This paper proposes a successive PM algorithm for joint TOA and DOA estimation in IR-UWB system to avoid 2D spectral peak searching. The proposed algorithm firstly gets the initial TOA estimates in the two antennas from the propagation matrix, then utilises successively one-dimensional (1D) local searches to achieve the estimation of TOAs in the two antennas, and finally obtains the DOA estimates via the difference in the TOAs between the two antennas. The proposed algorithm, which only requires 1D local searches, can avoid the high computational cost in 2D-PM algorithm. Furthermore, the proposed algorithm can obtain automatically paired parameters and has better joint TOA and DOA estimation performance than conventional PM algorithm, estimation of signal parameters via rotational invariance techniques algorithm and matrix pencil algorithm. Meanwhile, it has very close parameter estimation to that of 2D-PM algorithm. We have also derived the mean square error of TOA and DOA estimation of the proposed algorithm and the Cramer-Rao bound of TOA and DOA estimation in this paper. The simulation results verify the usefulness of the proposed algorithm.     

超宽带脉冲信号的光学生成方法研究

近年来超宽带(UWB)通信技术迅猛发展,在测量、雷达技术、民用和军事无线通信中有着重要的应用,UWB-over-fiber技术已经成为目前研究的热点,其中就包括UWB脉冲信号的产生方法。区别于传统的电子学方法,光子学产生方法不受电子瓶颈制约,可以实现很高的带宽,并且具有抗电磁干扰、重量轻、结构紧凑的优点。通过对比国内外本领域研究成果,讨论及总结了以下三种原理的UWB脉冲信号的光学生成方法:1)相位调制-强度调制转换(PM-IM);2)半导体光放大器(SOA)的非线性效应;3)频谱塑形和色散所致频域-时域映射,然后对各种方案进行了对比分析。     

多孔硅发光机制的分析

从量子力学的基本理论出发讨论了量子限制效应，推导出多孔硅有效禁带宽度增量并用量子限制效应和表面态及其物质在发光中作用的理论解释了ＰＳ光致发光的实验现象。