Combining Functional and Structural Approaches for Switched-Current Circuit Testing

This paper aims at defining an efficient test strategy for switched-current circuit testing. Taking into account the specificity of these circuits, we propose an original structural test technique as an alternative to traditionally-used functional verification. This technique is validated both at the cell and block levels. Test results demonstrate that a high fault coverage can be achieved with a low cost test procedure. A mixed strategy combining benefits of functional and structural approaches is derived.     

Correlation Between Static and Dynamic Parameters of A-to-D Converters: In the View of a Unique Test Procedure

ADCs are fully characterized by both static and dynamic parameters. Testing methods usually combine a histogram-based approach with a spectral analysis to determine the complete set of ADCs parameters. In the view of a unique test procedure, this paper investigates the correlation between both kinds of parameters. Experimental results demonstrate that under appropriate test conditions, the dynamic parameters extracted from a classical FFT exhibit significant variations against ADC offset, gain and non-linearity errors, opening the way of a low-cost test strategy in the frequency domain.     

A Low-Cost BIST Architecture for Linear Histogram Testing of ADCs

This paper investigates the viability of an ADC BIST scheme for implementing the histogram test technique. An original approach is developed to extract the ADC parameters from the histogram with a minimum area overhead. In particular, it is shown that the choice of a triangle-wave input signal combined with an appropriate time decomposition technique of the test procedure permits to drastically reduce the required on-chip hardware circuitry.     

指挥系统通信控制机自动测试诊断设备的研究

通信控制机是自动化指挥系统中的重要通信设备,技术密集,战损和出现故障的几率非常大。根据其测试需求,采用建模与仿真测试技术和基于专家系统的故障诊断方法,自行设计一体化便携式机箱,运用PXI总线和电路模块,组建自动化测试诊断设备。该检测设备对通信控制机通信能力、交换能力等性能指标进行检测。通过开关、电缆等附件将硬件电路匹配到所测试单元板接口的方式,并运行相应测试程序,完成通信控制机的性能测试、故障诊断,实现对通信控制机的快速检测和故障准确定位。其软硬件采用模块化设计,可用于多种型号的自动化指挥系统和民用通信控制设备的测试诊断。     

基于数据挖掘的视频放大电路故障字典建立优化技术

根据模拟系统故障检测的方法，采用数据挖掘技术来处理故障检测与诊断所获得的大量数据，提出了一种新型的基于数据库技术故障检测与诊断的方法。该技术能快速有效地进行故障诊断中大量数据的预处理。     

一种新颖的FPGA逻辑故障测试定位方法

FPGA的生产测试是FPGA设计中非常重要的环节,不仅要求能够检测芯片是否发生故障,还必须进行精确的故障定位,以便设计人员对设计故障和工艺故障进行改进。依靠将CLB输出级联的方式进行故障定位,往往使测试激励在时序设计上变得更加复杂。灵活利用CLB周围的三态门资源,可以对FPGA逻辑故障进行快速准确的定位,且测试激励简洁。     

小波奇异性检测及其在故障诊断中的应用

振动信号的突变点往往携带了设备运行状态的重要信息，基于小波分析的信号奇异性检测理论可以对信号的局部奇异性给出定量的描述指标，即奇异性指数。藉此理论，本文对较为复杂的往复式空气压缩机气阀振动信号作了分析，探讨了用于故障气阀自动识别的方法，收到了较好的效果。     

基于小波神经网络的模拟电路故障诊断方法及LabVIEW实现

采用虚拟仪器开发平台实现了基于小波神经网络的故障诊断系统,以蔡氏电路为例进行故障诊断,通过采用不同的数据处理方法以及不同的神经网络模型,验证了文中所提方法的可行性.人性化的交互界面,可以方便的从虚拟仪器前面板中得到故障的类型和故障的位置.由此可以看出基于虚拟仪器的故障诊断技术具有很强的实用价值.     

移动应用软件测试与认证技术分析

介绍了移动应用软件测试与认证技术的特点,对目前移动应用软件测试与认证技术中主流的技术进行了分析,并提出未来的技术发展方向和研究建议。移动应用软件测试与认证未来的发展对移动应用的安全可靠具有深刻的意义。     

融合探索性与脚本方法的第三方软件测试模型及其应用

随着用户对软件质量关注程度的提升,第三方软件测试受到普遍重视,但实际中经常会遇到既要求测试活动有效开展,又留给第三方测试活动时间较短,而且提供的开发文档不全面等问题。运用探索性测试方法能够发挥其快速、灵活的优势,能较好地解决这些困难。但同时,探索性测试也存在着文档不足且测试充分度不易度量等问题;而良好的测试质量管理和完备的文档则是传统脚本测试的优势。针对这些特点,文章提出“脚本一会话测试模型”,将探索性测试与经典脚本测试结合,同时扩展基于会话测试管理模式。通过测试某企业信息系统IT事件管理软件,验证该测试模型在B／S架构软件第三方测试中的适用性。     

Test and diagnosis of analog circuits: When fuzziness can lead to accuracy

Testing and diagnosing analog circuits is a very challenging problem. The inaccuracy of measurement and the infinite domain of possible values are the principal difficulties. AI approaches were the base of many systems which tried to overcome these problems. The first part of this paper is a state of the art of this research area. We present two fundamental approaches, model-based reasoning and qualitative reasoning, and the systems implementing them; a discussion and an evaluation of these systems are given. In the second part, we present and propose a novel approach based on fuzzy logic in order to go further in dealing with analog circuits testing and diagnosis. Tolerance is treated by means of fuzzy intervals which are more general, more efficient and of higher fidelity to represent the imprecision in its different forms than other approaches. Fuzzy intervals are also able to be semi-qualitative which is more suitable to the simulation of analog systems. We use this idea to develop a best test point finding strategy based on fuzzy probabilities and fuzzy decision-making methodology. Finally, a complete expert system which implements this approach is presented.Partly supported by a grant from HIAST, the Syrian Higher Institute for Applied Sciences and Technology.     

改革模拟实验教学和考试方法的尝试

模拟电子线路实验课对于电子线路教学改革和提高学生的工程实践能力具有重要作用。本文阐述了模拟实验课单独设课后教学及考试方法的改革尝试以及教学体会和教学效果。     

Reducing Test Time in the High-Volume Production of Analog Circuits using Efficient Test-Vector Generation and Interpolation Techniques

Test cost is one of the main factors determining the profit margin of a device in production. Current test strategies require hundreds of measurements to determine the specifications of a parameter. In this paper, we present an automatic test-vector generation technique that is based on transfer function manipulation and requires only one circuit simulation. The proposed method consists of generating the first set of vectors by applying a derivation technique to the golden transfer function of the circuit under test (CUT). An interpolation technique allows a new transfer function to be constructed based on the first set of test vectors. The difference between the reconstructed transfer function and the golden transfer function is used to select the second set of test vectors. These new test vectors are selected to achieve the best possible fit. Our technique reduces the test vector size to values that at present can be achieved only by using powerful and time-consuming fault simulation tools. As an example, we apply the method to state variable and Chebyshev filters. We also compute the fault coverage in order to demonstrate the effectiveness of this new technique.     

运算放大器和电压比较器测试技术的实践应用

针对半导体集成电路运算放大器失效模式指出了其测试方法,通过分解半导体集成电路运算 (电压)放大器、电压比较器测试电原理图,说明了该类器件的一些主要性能参数测试原理,介绍了在生产实践中测试技术应用方法和注意事项,提出了生产单位怎样建立完整的运算放大器IC测试系统的构想.     

基于小波分析和人工免疫算法的模拟电路故障诊断

受生物免疫系统自己-非己识别过程的启发,提出了一种基于小波分析和人工免疫算法的模拟电路故障诊断的新方法。该方法首先利用小波变换,归一化和主元分析法作为预处理提取模拟电路的最优故障特征向量,然后利用反面选择算法的检测器对故障信息进行检测,从而实现模拟电路故障的分类。计算机仿真证明该方法是可行的。     

面向FPGA芯片开发的测试方法设计与实现

针对自主研发的SOI-CMOS工艺FPGA芯片VS1000,开发出一种FPGA测试工具(VVK)软件系统.VVK是借助Verilog HDL描述电路和UCF约束电路的特性开发并实现的全自动测试方法.其意义在于解决了设计FPGA芯片过程中面临的最冗繁棘手的验证和测试难题,可以实现FPGA全芯片、内部各种逻辑模块的功能结构的验证和测试.该工具可以用于FPGA流片前的行为级、晶体管级的仿真和验证、FPGA圆片测试、以及FPGA芯片抗辐照测试.验证和测试的结果证明了这套方法的正确性、高效性,同时这种测试方法也适用于其他架构FPGA的测试.     

网上在线考试系统设计及应用研究

随着互联网科技的不断发展,网上在线考试系统的应用越来越广泛。以《计算机电路基础》网上在线考试系统的设计为例,介绍了网上考试系统的建立思路和应用,并对理工类的公式、图表录入及上传方法做了介绍。对网上在线考试系统的结果进行总结,指出理工类网上在线考试系统尚需完善的内容。     

Distributed Diagnosis of Interconnections in SoC and MCM Designs

An interconnect test and diagnostic scheme based on distributed BIST resources in SOC and MCM designs is described. Test and diagnosis is enabled by embedding cascaded test pattern generators and reconfigurable signature analyzers into the design. The theory of partitioning of linear registers is applied to devise a two phase distributed diagnosis strategy. The design of a novel MISR reconfiguration scheme that enables high diagnosis resolution is presented.     

遥测遥控数据测试系统的研究与应用

海上靶场联网装备众多,遥测遥控装备布局分散,试验环境复杂,测控通信网每个环节出现故障都会影响试验。没有专门测试设备的情况下,寻找、排查故障比较困难,定位不准确、分析原因不准现象时有发生,且耗费大量人力和物力,排故周期长,影响试验任务的顺利进行。同时,目前靶场没有专门测试遥测和遥控数据传输的系统,为了适应未来导弹试验任务的需要,有必要研制能够测试遥测遥控装备外测、遥测和遥控为一体的综合测试系统,能够及时对各种数据传输进行检测,查找并排除故障,及时分析和解决问题,确保遥测遥控装备数据传输的正常。     

舰载无线通信设备通用测试诊断专家系统设计

针对舰船在航渡过程中无线通信设备故障维修保障难度大的情况,结合目前舰载主用无线通信设备的性能指标和结构特点,研究设计了基于规则和模糊推理的舰载无线通信设备通用测试诊断专家系统,通过故障诊断专家知识库提供的知识和经验进行逻辑推理和分析判断,可对故障设备整机和单板进行自动检测,实现了对多型舰载无线通信设备的故障诊断定位,提高了舰船在航渡过程中无线通信设备维修保障的能力和水平。