一种新Turbo码交织器的VHDL设计

介绍了Turbo码和交织技术，分析了几种常用交织算法的特点。根据组合交织器的设计思路，提出了隔行写入螺旋式交织方案。利用硬件描述语言（VHDL）编程设计了这种交织器的电路，并给出了仿真结果。     

VHDL语言在电子设计实践中的应用

随着ASIC和计算机技术的不断发展，借助HDL完成硬件设计已成为电子设计领域的迫切需求。介绍了一种硬件描述语言，即VHDL语言的功能特点以及设计数字逻辑电路和数字系统的新方法，并以设计实例的形式，进一步分析并探讨了将其应用于电子设计自动化(EDA)实验中的优越性。     

Efficient approaches to low-cost high-fault coverage VLSI BISTdesigns

This work introduces a built-in self-test (BIST) design methodology that can sequentially test large very large scale integrated (VLSI) circuits with very high fault coverage. The proposed techniques, circular BIST ((BIST) and (BIST with pseudopartial scan (PPSCAN), are modeled after the principles of the circular self-test path (CSTP). The basis of this method is to trade a minimal increase in hardware overhead for a large increase in fault coverage. It is shown that this technique yields a much higher fault coverage with reasonable time and test vector length when compared with existing sequential test methods. The effectiveness of the technique has been demonstrated by applying it to practical VLSI circuits, which include: 1) the system control coprocessor (CP0) of MIPS 3000 central processing unit (CPU) core and 2) the SIMD graphic engine, namely, enhanced memory chip (EMC). The BIST results show that (BIST and its derivative (BIST with pseudopartial scan (PPSCAN) are feasible for practical VLSI designs and generate BIST with high fault coverage and low overhead     

基于球体描述Vague决策的模拟电路故障诊断方法(英文)

提出一种基于球体描述Vague决策的模拟电路故障诊断方法。首先,采用小波变换预处理待测电路输出的电压故障特征。然后,每类样本集训练成一个最小超球体。最后,测试样本由本文定义的模糊决策规则进行判断,其中该规则由测试样本和描述球体中心之间的Vague加权距离得到。该模糊决策规则融合了测试样本正反隶属度值和描述球体的权值,可以有效地处理不确定信息。本文从理论上证明了该决策方法的可靠性。将该诊断方法应用于两种实际电路的测试,并与其他两种诊断方法进行对比。实验结果表明本文方法取得了良好的诊断性能,并减少诊断时间。     

Next generation functional test program development system

While superior-quality functional board test has been a goal for most high reliability electronics manufacturers, the time and effort for generating such test programs using today's tools and processes makes this difficult to achieve in a cost effective manner. This paper will introduce a revolutionary approach to functional board test program development that combines the comprehensiveness of software-based simulation with the speed and simplicity of hardware emulation. The result is a functional Test Program Set development system that can produce high fault coverage, diagnostic test programs in a fraction of the time it takes using traditional techniques, and at a lower unit cost. In this paper we will first provide a brief background on the strengths and weaknesses of current software and hardware TPS development techniques-simulation hot mock-up. Next, the new approach is described in detail and contrasted against the existing techniques. Finally, actual experience to date using a prototyped system is presented     

VLSI芯片测试中用户辅助硬件误差的消除方法

在 VL SI测试中 ,由于用户引入辅助硬件产生的误差问题 ,一直是阻碍测试精度和可靠性的关键问题。本文以 ITS90 0 0 MX为背景 ,介绍在 VL SI测试中 ,对辅助硬件所造成误差的一种解除方法。在现有条件下 ,实现简单、方便 ,可供有相应测试系统的测试工作者参考。     

基于传输线理论的机上电缆断点定位仪设计

在分析目前机上电缆传统测试方法所存在的弊端的基础上,针对当前自动测试系统未解决的机上电缆测试问题,提出了一种基于传输线理论的机上电缆断点位置测试方法,给出了断点定位仪硬件电路设计和误差分析方法,并对误差分析得到的相关参数进行了仿真实验,根据仿真结果,给出断点定位仪的优化方法,可实现对机上电缆断点的精准定位。     

A self-healing strategy with fault-cell reutilization of bio-inspired hardware

The self-healing strategy is a key component in designing the bio-inspired embryonics circuit with the structure of cell arrays. However, the existing self-healing strategies of embryonics circuits mainly focus on permanent faults inside the modules of cells such as the function module and the configuration register, while little attention is paid to transient faults. From the point of view of obtaining high efficiency of hardware utilization, it would be a huge waste of hardware resources by permanent elimination when a cell only suffers a transient fault which can be repaired by a configuration mechanism. A new self-healing strategy, the Fault-Cell Reutilization Self-healing Strategy(FCRSS) which presents a method for reusing transient fault cells, is proposed in this paper. The circuit structures of all the modules in the cells are described in detail. In the new strategy, two processes of elimination and reconfiguration are combined. Within the process of fault-cell elimination, cells with transient faults in the embryonics circuit array could be reused simultaneously to replace the functions of the cells on their left side in the same row. Therefore, transient fault-cells in a transparent state can be reconfigured to realize the fault-cell reutilization. Finally,a circuit simulation, resource consumption, a reliability analysis and a detailed normalization analysis are presented. The FCRSS can improve the hardware utilization rate and system reliability at the expense of a small amount of hardware resources and reconfiguration time. Following the conclusion, the method of determining the optimal self-healing strategy is presented according to the environmental conditions.     

数字电路板故障诊断方法

介绍了数字电路故障诊断向量测试法中功能测试和在线测试的具体方法。结合现代武器系统数字电路板的检测和诊断需要,分别阐述了数字组合和时序电路板、数模混合电路板及微处理器电路板的故障诊断策略及步骤。举例说明了故障诊断方法在数字电路板自动测试系统中的应用。     

双曲正切变换在VLSI设计中的研究应用

从双曲正切tanh变换在稳健的信号处理和统计估计的观点叙述了双曲正切变换的特性。介绍了利用双曲正切变换特性设计VLSI的方法。通过实际的设计证明,双曲正切变换特性在超大规模集成电路VLSI的设计中有着很好的应用前景。特别是在模拟VLSI的设计中,对包含噪声输入信号的估计和统计分析具有广泛的应用。     

Optimal design of RTCs in digital circuit fault self-repair based on global signal optimization

Since digital circuits have been widely and thoroughly applied in various fields, electronic systems are increasingly more complicated and require greater reliability. Faults may occur in elec-tronic systems in complicated environments. If immediate field repairs are not made on the faults, elec-tronic systems will not run normally, and this will lead to serious losses. The traditional method for improving system reliability based on redundant fault-tolerant technique has been unable to meet the requirements. Therefore, on the basis of (evolvable hardware)-based and (reparation balance technology)-based electronic circuit fault self-repair strategy proposed in our preliminary work, the optimal design of rectification circuits (RTCs) in electronic circuit fault self-repair based on global sig-nal optimization is deeply researched in this paper. First of all, the basic theory of RTC optimal design based on global signal optimization is proposed. Secondly, relevant considerations and suitable ranges are analyzed. Then, the basic flow of RTC optimal design is researched. Eventually, a typical circuit is selected for simulation verification, and detailed simulated analysis is made on five circumstances that occur during RTC evolution. The simulation results prove that compared with the conventional design method based RTC, the global signal optimization design method based RTC is lower in hardware cost, faster in circuit evolution, higher in convergent precision, and higher in circuit evolution success rate. Therefore, the global signal optimization based RTC optimal design method applied in the elec-tronic circuit fault self-repair technology is proven to be feasible, effective, and advantageous.     

基于轻量化BIM的高空台液压加载试验智能管控技术

为了使航空发动机高空模拟试车中的液压加载试验智能高效地运行,完善并优化其试验平台,提出一种基于轻量化建筑信息模型（BIM）的液压加载试验智能管控技术。建立了支持管控平台运行的高空台液压加载试验软硬件协同运行架构,提出了基于WebGL的数据在Web端3维模型上实时展示的技术,以提高试验操作人员对试验进行监测的直观性。所设计的智能管控平台同时集成了试验设置与试验操作、数据管理、试验过程分析、故障诊断分析等功能。结果表明：所提出的基于轻量化BIM的智能管控技术可使试验操作人员直观、便捷、高效地进行试验流程管控、数据综合管理、设备健康状况分析,提高了高空台液压加载系统试验的智能化、自动化水平。     

基于小波变换的容差电路故障诊断

针对目前模拟电路中电子元器件存在的容差与非线性导致电路故障难以检测的现状,设计了适用于诊断由器件超出容差所引起的模拟电路故障的小波分析诊断方法。通过设定故障进行蒙特卡罗容差实验,采用小波神经网络,对故障输出信号进行小波分析提取其小波高频系数参量,经PCA分析和归一化后形成训练特征向量,并经过BP神经网络训练后,故障信号通过小波神经网络后能够快速精准的对故障器件进行定位。通过大量样本进行仿真计算表明所设计的小波特征参量故障诊断法对于模拟电路具有很好的故障分辨率。     

超短波电台自动检测与故障诊断系统设计

介绍了超短波电台自动检测系统与故障诊断系统的功能,并根据功能要求进行了硬件电路的设计,采取面向信号的ATLAS语言进行软件设计和建立在专家知识输入故障推理模型.该系统经使用证明,检测结果精确,检测效率较高.     

基于CPLD的多路脉冲序列信号检测器设计

用VHDL语言在CPLD器件上实现了一种多路脉冲序列信号检测器,能够用七段数码管实时显示各路已检测出序列信号数目,电路各摸块用VHDL语言来描述。文章介绍了仿真信号的形成原理和电路设计方法,并给出了部分电路和仿真波形。整个多路脉冲序列信号检测器设计在一块CPLD芯片上,与其他方法设计的序列信号检测器相比,具有体积小、可靠性高、功牦低的特点。由于采用模块化的设计,对功能的修改和增加只要修改VHDL源程序,而不必更改硬件电路,从而实现数字系统硬件的软件化。     

基于FPGA的高清CCD视频信号预处理电路的设计

在高清CCD图像传感器KAI-2093和视频信号处理芯片AD9847工作原理的基础上,设计了高清CCD成像系统视频信号处理电路。选用FPGA器件作为硬件设计载体,使用VHDL语言对AD9847的初始化配置和驱动时序发生器进行了硬件描述。采用ISE10．1软件对所做的设计进行了功能仿真。仿真结果表明,所研制的高清CCD视频信号处理电路不仅可以满足高清CCD成像系统视频处理的要求,而且性能可靠,使用灵活。     

关于航空发动机数字电子控制

为了给即将问世的吸气式发动机控制系统提供先进技术,我们以WP-13作为技术验证机建立了全权限数字电子控制系统研究计划.研究计划包括控制原理和方法,实时控制系统仿真,自动故障检测、定位和重构,机载的发动机数字电子控制器(具有解析和硬件余度),敏感和驱动系统及全控机械液压备份装置.本文概略地介绍这项计划,包括:研究的起因,一般的系统介绍,目标、技术需求及进展,展望.     

微机测控系统输入输出接口智能故障诊断

介绍了用于对微机测控系统输入接口板、输出接口板测试硬件系统的构成,设计了接口卡电路.针对两块电路板,提出了对数字电路板的测试和故障诊断分四个层次,即整板级、功能模块级、单片级和功能输出点级的思想,采取了对功能输出点进行编码的方法建立数字电路板测试的标准知识库,提出了使用功能标志矩阵的方法对各个层次的测试结果进行存储的方法,并根据各个层次测试的关系及相应功能标志矩阵的关系建立了智能化故障诊断程序.     

合理运用SI技术快速收敛高速数字电路设计

随着数字电路集成度和工作频率的不断提高,信号完整性(Signal Integrity, SI)问题在产品研制过程中越来越突出。以惯导系统中的某导航计算机为例,针对故障信号回路,使用仿真软件对其SDRAM时钟信号进行信号完整性仿真,并进行优化设计。通过对比优化前和优化后的仿真与测量结果,验证了由于端接参数不匹配造成SDRAM时钟信号的非单调性畸变问题。仿真与测量结果表明,在产品研制流程中加入信号完整性仿真环节有利于设计快速收敛,提前规避风险,缩短研发周期,降低设计成本,提高电路产品的可靠性和电磁兼容性。     

X射线脉冲星导航硬件脉冲轮廓累积研究

为了在X射线脉冲星地面实验系统仿真源模拟产生X射线的基础上,能够快速稳定地得到脉冲轮廓,采用硬件历元叠加的方法获得脉冲轮廓。研究了用硬件实现历元叠加及其数据整合的算法,该算法首先在MATLAB现场可编程逻辑阵列(FPGA)中实现,再通过MATLAB硬件描述语言(HDL)代码生成模块把算法转换成HDL,经编译后获得配置硬件的Bit文件,最终在开发板FPGA上实现数据处理的硬件模块。一段时间内的光子到达时间数据通过MATLAB算法得到的脉冲轮廓数据与通过硬件模块处理后得到的数据结果存在误差,在单个时间窗口内误差最大值为2个光子数,误差平均值占光子数统计平均值的0.084%;两组统计的脉冲轮廓数据中不同数据占总数据个数的9.481%,这样的误差不影响后端模拟导航模块的导航。利用硬件实现的历元叠加及其数据整合模块具有处理速度快、设备紧凑、功耗低的特点,为航天器利用X射线脉冲星导航提供了一种可行的硬件数据处理技术上的支持。