实现测试复用的SOC设计中的测试结构

在系统芯片SOC(system on a chip)设计中实现IP核测试复用的芯片测试结构一般包含两个部分：1)用于传送测试激励和测试响应的片上测试访问机制TAM;2)实现测试控制的芯片测试控制器。文章分析了基于测试总线的芯片测试结构,详细阐述了SOC设计中测试调度的概念,给出了一种能够灵活实现各种测试调度结果的芯片测试控制器的设计。     

无线通信设备通用测试方法

随着我国无线通信的迅速发展,对无线通信设备的技术要求越来越高,如何确定其性能指标已成为设备生产厂商与网络运营商以及通信测试机构所共同关注的问题。本介绍了用于确定无线通信业务特性的测试方法。这些删试方法适用于频率调制或相位调制系统,频率范围：25MHz到1000MHz,信道间隔12.5kHz,20kHz及25kHz。     

一种可变测试集的协议一致性测试方法

目前常用的协议一致性测试的测试方法是首先对协议规范建模，然后通过模型生成测试集，最后执行测试集．这种方法存在执行效率不高和实际测试范围可能被缩小的问题，为此本文提出一种可变测试集的方法，通过动态执行测试集提高其执行效率，同时从与协议实现无关的角度扩大协议的实际测试范围．     

仪器厂商点燃春季数字测试大赛

横河电机与大唐移动进行仿真器合作项目并发布两款最新产品 横河-大唐移动仿真器合作项目主要是为大唐移动终端开发平台(TDSCDMA)提供基于嵌入式的调试工具advice PRO,该工具为满足客户的需要特别进行了部分修改以全面支持终端开发平台,帮助其在嵌入式开发中直观了解状态和软件性能.     

基于8852的雷达领域可测性技术的探究

雷达领域插件级设计的模块化、软件化、标准化、继承性的推广使得针床测试台的性能价格比得以提高,我们基于美国TERADYNE公司的"Spectrum 8852"自动测试设备,完成了6个品种插件的测试夹具、软件开发.夹具开发的自动化程度高、价格低;软件上运用4种测试理念对插件进行全方位测试,互相覆盖、互相补充,提高了故障覆盖率和准确率,具有推广使用价值.同时也给出了一些我们在开发过程中遇到的、有关可测试性设计考虑的建议.     

IP网络测试技术

介绍了IP设备及网络测试的发展现状,分析了IP设备及网络测试技术的发展趋势。     

测试接口原理与电源芯片应用案例

基于对IC测试接口原理和系统结构的阐释,具体针对型号为SL431L的电源芯片,提出改进测试电路的方法,电压测试值的波动范围小于3mV。     

如何选购数字SSI／MSI测试设备

集成电路(IC)测试是伴随着集成 电路的发展而发展的,它对促进集成电路的进步和应用作出了 巨大的贡献.为了确保产品质量和研制开发出符合系统要求的电路,在集成电路研制、生产和应用等各个阶段都要进行反复多次的检验、测试.中小规模电路具有设计灵活的特点,常用作大规模电路的外围电路,应用十分广泛.因此保证以高效率、低费用完成大批量SSI/MSI的测试和生产是十分必要的.由于我国LSI/VLSI无 论是生产及应用均落后于发达国家,远不如MSI/SSI应用普及,国内IC测试 从需求、效益和测试费用的投入,也未达到普遍追求大型测试系统的阶段,另外国内SSI/MSI测试仪已达到国外同 类产品水平,而价格与进口机型相比要低得多,所以国内SSI/MSI测试仪的市 场仍有一定的规模.     

About applicability of quasi-statistic method of autodyne systems analysis

There is shown applicability of quasi-static method for analysis of differential equations of single-circuit autodyne generator. We propose the methodology of quasi-static calculation of autodyne response taking into account of members of higher approximation order. The estimation of calculation inaccuracy in case of quasi-static method application is given, conditions of stability of the system of autodyne generator-reflecting object are considered, and comparative calculation of autodyne response for a cases of application of zeroth and tenth approximations.     

About principal possibility of automated following by active frequency of non-stationery processes spectrum by means of active filter

It is underlined explicit usefulness and efficiency of hardware analysis of active spectrum of non-stationery processes, necessity of automated following by frequency of input signal filters (AFFF) application as analyzing filters. It is mentioned drawbacks of analysis methods of such filters and necessity of approval possibility of frequency self-tuning of any type filters (FSAF) of high order. Possibility of FSAF and, hence, AFFF is proven in terms of application of some known features of manual regulation of electrical filters. By means of computer mathematical modeling in system VisSim/com it is proven AFFF possibility. It is underlined possibilities of some useful their application.     

Forced nonlinear precession of the magnetization vector under the conditions of an orientation transition

Forced nonlinear precession of the magnetization vector in a normally magnetized magnetic plate under the conditions of an orientation transition is considered. It is shown that, in the field lower than the form demagnetization field, the variable circularly polarized field causes precession of the equilibrium position of the magnetization vector. It is demonstrated based on a vector model in which the precession period of the equilibrium position is inversely proportional to the squared amplitude of the variable field and the sine of the angle of deviation of the equilibrium position of magnetization from the constant field. It is shown that the critical parameters necessary for excitation of precession of the equilibrium position are the amplitude and frequency of the variable field. Diagrams determining domains of existence of precession of the equilibrium position for different saturation magnetization of a magnetic plate are constructed in terms of the coordinates variable field amplitude-frequency. The role of dissipation of magnetization oscillations in the determination of the critical parameters is elucidated. The features of precession in the presence of asymmetric excitation and in the presence of anisotropy in the plane of the plate are noted.     

基于双Wollaston棱镜的偏振测量系统的精度分析

为了研究航天偏振辐射计的偏振测量精度,从偏振参量的反演过程出发,结合偏振辐射定标的方法,得出Wollaston棱镜安装角度误差和因加工工艺等造成的光束非正交的角度误差对偏振测量有一定的影响。结果表明,在角度误差一定的前提下,偏振度测量误差随入射光偏振态的变化而变化;当Wollaston棱镜角度误差都控制在0.1°内,偏振度测量精度满足航天偏振辐射计的指标要求。     

红外无线信道特性的评价方法

基于评价室内红外无线通信信道的目的,采用改进的朗伯定律描述室内表面的漫射特性,分析了信道中直射及漫射分量的大小,定义了评价红外无线信道的瞬态响应及时延的表达方法,并针对几个实用信道进行了模拟。结果表明,光接收机的ＦＯＶ及位置的变化对信道特性的影响较大。通过信道特性的分析比较,对构成高健壮性的室内光无线通信信道有积极意义。     

Topological temperature compensation in hybrid-film microthermostat on a basis of accounting of heat emission of thermostatically controlled elements of radio engineering devices

It is considered carrying out the topology temperature compensation of thermostatically controlled elements on a basis of application of effect of minimal statistic inaccuracy of temperature control with purpose of minimization of temperature inaccuracy of radio engineering devices. Numerical simulation of two-dimension non-stationery temperature fields of thermostable substrate of hybrid-integral circuits is carried out, taking into account heat emission of thermostatically controlled elements and existing heat exchange mechanisms of proportional temperature controller.     

TD-LTE系统帧配置方法的研究

针对TD-LTE无线网络规划中时隙规划的需要,对TD-LTE小区帧配置方法进行了研究.首先归纳总结了TD-LTE系统吞吐量计算方法,通过仿真,验证了TD-LTE帧配置对系统容量的影响.然后研究了TD-LTE单业务小区的帧配置方法,设计建立了基于帧结构的TD-LTE小区业务吞吐量仿真平台,并对单业务小区的用户平均吞吐量进行了仿真分析,给出了部分单业务小区的最佳帧配置建议.最后,仿真分析了多业务小区的用户平均吞吐量,给出了部分混合业务下小区的最佳帧配置建议.     

男性不孕症患者精子超微结构异常的电镜诊断

对63例男性不孕症患者的精子做了电镜超微结构观察,并做了与之对应的光镜及常规检查。除11例为死精症外,52例均为精子结构异常。52例中40例为头部异常,12例尾异常。头部异常主要为无顶体、顶体发育不良和染色质发育不良,尾异常主要为2＋9＋9结构异常及接柱异常。结果显示精子电镜超微结构检查能很好地避免误诊,并对精子结构异常的种类做出准确的诊断。     

The role of transport processes of nonequilibrium charge carriers in radiative properties of arrays of InAs/GaAs quantum dots

The results of time-resolved photoluminescence studies of heterostructures containing monolayer arrays of InAs/GaAs quantum dots are presented. A two-component time dependence of intensity of photoluminescence from the ground state of quantum dots, with characteristic times of the slow component up to hundreds of nanoseconds and those of rapid one several nanoseconds, is studied. It is shown that the slow component is determined by the transport of nonequilibrium charge carriers between the quantum dots. At low temperatures, the time of the slow component is determined by tunneling, and at high temperatures by thermal escape of nonequilibrium charge carriers. The ratio of the contributions of tunneling and thermal escape is determined by the degree of isolation of quantum dots. A theoretical model is constructed that describes the effect of the dynamics of carrier transport on the emergence and decay of the slow component of photoluminescence.     

多自由度无人船系统建模

本文通过对多自由度下无人船的运行情况分析,提出了多自由度的无人船建模方法,主要是通过分析建立无人船的六自由度的MMG分离型模型,并依次减少一个自由度,推导出了其五自由度、四自由度与三自由度下的数学运动模型,解决了无人船在各个自由度下的建模问题.在建模时依次讨论了各个自由度下无人船舵、螺旋桨、粘性流体动力的力与力矩模型,...