含"黑箱"子网络电路的分析

文章讨论了“黑箱”子网络的CCCS星型等效电路参数的测试方法，在此基础上，得到了含“黑箱”子网络电路的网络方程。该方法具有系统性强、便于计算机自动建立方程的优点。因此，对大规模电路，特别是含线性集成芯片电路的分析研究，具有理论和实际意义。     

Multisim在高频电路实验中的应用

针对传统高频电路实验教学中存在的问题,提出在实验教学中引入Multisim进行辅助分析与设计。利用Multisim对高频电路中的典型电路振幅调制及解调、丙类功率放大器进行了仿真研究,其各项结果与理论一致,且可以很方便地改变元件或电路中参数,观察不同条件下电路的工作情况。将虚拟实验和传统实验有机结合起来,能更好地提高学生的动手能力和探索精神。     

模拟电路的多频灵敏度故障诊断方法

文章在灵敏度故障诊断方法的基础上提出多频灵敏度参数识别故障诊断方法，并给出选择测试频率的一般原则。该方法能够适用于可及测试节点较少的电路。针对模拟电路中一般只存在部分元件故障的情况，进一步提出只识别部分故障元件参数的多频灵敏度故障诊断方法，使该方法能适用于更大规模的电路。电路仿真结果验证了所提方法的有效性。     

基于图象的条形码识别的算法研究及设计

文章以条码技术、图象处理技术以及计算机软件技术为基础,设计出比较完善可靠的条形码识别算法.文中着重介绍了条形码识别的算法,并且对三种情况下即:理想的、小于五度倾斜的、稍微模糊的条形码进行了识别测试并给出改进思路.     

二维条形码的编码与识别

论述了二维条码的编译码过程，MCODE条码是堆积式二维条形码的一个非常重要的分支。利用MCODE条码可以将文字信息以条形码的形式进行处理。为了降低二维条形码的识别误码率，提出了一种针对二维条形码位图的图形处理算法－－边缘规整算法。事实证明，该算法在处理被污染的二维条形码方面是非常有效的。     

采用RDF的硅物理不可克隆函数设计与评估

利用65 nm CMOS制造工艺下的随机掺杂涨落(RDF)模型,建立起随机路径延时模型,通过修改台积电(TSMC) 65 nm低k电介质工艺器件模型库参数,完成了仲裁器型PUF电路的设计和评估.实验在Synopsys Hspice C-2010模拟设计平台上完成,测量了PUF电路的片间差异和片内差异参数,评估了128位PUF电路的性能.与实测电路参数的对比结果证明了该方法的有效性.     

PIN光探测器的小信号电路模型参数的提取

提出了一种利用自适应遗传算法提取p-i-n光探测器小信号电路模型参数的方法.文章首先根据p-i-n光探测器的物理结构确定其等效电路模型,进而采用自适应遗传算法对测量的S参数进行拟合,提取模型参数.自适应遗传算法自动优化交叉概率和变异概率,避免了以往遗传算法中易早熟的缺点.利用该法成功提取出模型的10个参数,建立光探测器小信号电路模型.在130 MHz～20 GHz范围内的实验结果表明,模型仿真结果和测量结果相吻合,证明了这种参数提取方法的可靠性.     

LC移相电路在调频和鉴频中的应用与仿真

由LC回路构成的移相电路具有调节输入输出信号之间的相位关系的作用,在通信电路中有广泛的应用。为深入研究LC移相电路的应用原理,论文推导了LC移相电路的传递函数,分析相移与电路参数的关系,讨论移相电路在间接调频和正交鉴频电路中的作用。利用Multisim仿真软件分别对调频和鉴频电路进行了仿真实验并验证理论分析结果,在通信电路课程学习中有助于学生加深对这部分知识的理解和掌握,提高应用能力。     

基于UC3842的30W升压电路设计

文章首先对UC3842芯片做了简单的介绍,描述了其在电路中的主要功能。然后对DC－DC直流Boost升压电路的充电过程和放电过程进行了详细介绍。再根据Boost电路基本公式设计了电路中的核心器件——电感,并利用RC振荡电路设定了开关频率以及电路电流和电压等参数。文中设计了电路原理图,并对电路原理图进行了简单介绍。最后给出了电路的测试结果。     

基于Multisim的电子线路分析与仿真

针对传统电子技术课程教学中存在的问题,提出在教学中引入Multisim进行辅助分析。利用Multisim对电子技术课程中的典型电路进行仿真,其各项结果与理论一致,且可以很方便地改变电路元件参数,观察不同条件下电路的工作情况。将虚拟实验和传统教学有机结合起来,能更好地提高学生的学习积极性和探索精神。     

Black box modelling of the Op-Amp including switching power supply on effect

In general, models at the device and circuit levels are very important in system design. Building compact models at the circuit level is complicated, needs a lot of physical information about the circuit and moreover it has a long simulation time. We present in this paper an alternative modeling methodology, black box modeling. In this technique, we need only the output behavior of the circuit. We get this behavior either from measurements or simulations from previously built compact models. We apply this technique to the operational amplifier as a case study. We use the Op-Amp, BSIM3v3-based compact transistor model, to obtain the performance of the circuit. An excellent agreement is obtained between the output voltage from the black box model of the Op-Amp (for both of the effect of the switching power supply on and the steady state behavior) and the corresponding output from the model used to build it.     

嵌入式软件的云平台覆盖测试

本文介绍的是一种针对嵌入式软件的基于云平台的覆盖率测试方法,以及相关工具的应用。通过工具将插桩编译后的软件装载到目标机上运行,黑盒手工执行测试,白盒显示函数调用图和控制流程图,同时将执行和未执行代码分颜色显示,对未执行的代码进行人工分析,可以通过增加测试用例来提高覆盖率。     

Characterization of integrated logic circuits

The characterization of integrated logic circuits must be accomplished in a manner which fully accounts for the circuit's nonlinear behavior and is amenable to experimental verification. The approach taken in this paper is to describe both the dc and the transient performance of the circuit by developing nonlinear equivalents of the 2-port "black box" parameters used in specifying linear networks. Such terminal parameter characterization has the obvious advantage of eliminating the need to probe the integrated circuit for testing purposes. In addition, knowledge of terminal performance is a necessity when the circuit is studied from a system point of view. In this paper an emitter-coupled logic circuit is used as an example to illustrate the analysis techniques. After accomplishing the terminal parameter characterization of this circuit, attention is directed towards using these results to establish a design procedure. To this end the relationship that exists between power consumption and the circuit safety margins is explored, and the minimum power-delay time product is derived. The analysis accounts for the parasitics which are present in a monolithic integrated circuit and illustrates the use of the nonlinear transistor model.     

Theoretical study of the circuit architecture of the basic CFOA and testing techniques

This paper examines the closed-loop characteristics of the basic Current-Feedback Operational Amplifier (CFOA), and in particular, the dynamic response. Additionally, it also examines the design and advantages of the CFOA regarding its ability to provide a significantly constant closed-loop bandwidth for closed-loop voltage gain. Secondly, the almost limitless slew–rate provided by the class AB input stage that makes it superior to the voltage-mode operational amplifier (VOA) counterpart. Additionally, this paper also concerns the definitions and measurements of the terminal parameters of the CFOA, regarded as a ‘black box’. It does not deal with the way that these parameters are related to the properties of the active passive and active components of a particular circuit configuration. Simulation is used in terminal parameter determination: this brings with it the facility of using test conditions that would not normally prevail in a laboratory test on silicon implementations of the CFOAs. Thus, we can apply 1mA and 1mV test signals from, respectively, infinite and zero source impedances that range in frequency from d.c to some tens of GHz. Also, we assume the existence of resistors with identical Ohmic value and very high value ideal capacitors. Where appropriate, practical test methods are referred to physical laboratory prototypes.     

基于LS-SVMs机翼盒段壁板损伤辨识研究

针对大型的碳纤维复合材料机翼盒段壁板结构,研究采用光纤布喇格光栅测量结构应变场分布,提出采用最小二乘支持向量机(LS-SVMs)建立应变场-损伤非线性黑箱模型辨识结构损伤法,对典型的飞机碳纤维复合材料盒段壁板结构进行健康监测研究.针对大尺寸带有加强桁条和螺钉通孔的复杂结构盒段壁板试件,建立了7个点的布喇格光栅应变测量网络测量试件有代表性区域的应变场.通过施加280个不同的点载荷模拟损伤,建立应变场与损伤的非线性映射关系黑箱模型;采用LS-SVMs的黑箱模型辨识法对应变场进行有效辨识,准确地判别出280种结构损伤的位置和程度.     

基于FPGA的集成电路测试系统设计探讨

随着集成电路的功能以及各种参数的大量增加,要想保证电路的可靠性,就必须重视集成电路的测试功能,在传统的测试过程中,对集成电路的测试是依靠有经验的测试人员使用信号发生器、万用表和示波器等仪器来进行测试的.这种测试方法测试效率低,无法实现大规模大批量的测试.为此,本文分析了基于FPGA集成电路测试系统的优越性,并选取某集成电路的老化测试系统设计为例进行重点探讨.     

Optimization-based multifrequency test generation for analog circuits

A robust test set for analog circuits has to detect faults under maximal masking effects due to variations of circuit parameters in their tolerance box. In this paper we propose an optimization based multifrequency test generation method for detecting parametric faults in linear analog circuits. Given a set of performances and a frequency range, our approach selects the test frequencies that maximize the observability on a circuit performance of a parameter deviation under the worst masking effects of normal variations of the other parameters. Experimental results are provided and validated by HSpice simulations to illustrate the proposed approach.     

掺铒光纤放大器黑盒模型在波分复用系统中的实验验证

介绍了掺铒光纤放大器的黑盒模型 ,随后给出应用黑盒模型的参数测量步骤 ;测量了一台内部参数和结构未知的商用 EDFA对六信道 WDM光信号的放大光谱图。通过实测结果与黑盒模型仿真计算得到的结果相比较 ,证明了黑盒模型具有很好的精度 ,适用于估算商用波分复系统的性能。     

发射装置电路盒散热技术及其应用

发射装置电路盒在工作过程中产生的热量,会对电路盒以及发射装置的可靠性产生影响。如何在电路盒的设计制造过程中尽量减少热量的产生,同时又能将工作中所产生的热量尽快散发出去,将热量产生的影响控制在电路盒正常工作范围内,是一个重要的问题。文章针对上述问题展开论述,阐述了散热性对发射装置电路盒工作性能的影响,分析了电路盒中热量的...     

A complete small-signal equivalent circuit model of cooled butterfly-type 2.5 Gbps DFB laser modules and its application to improve high frequency characteristics

A small-signal equivalent circuit model of 2.5 Gbps DFB laser modules with butterfly-type dual-in-line packages has been proposed and verified using extracted parameters. Parameters related to the equivalent circuit have been extracted from measured S parameters using the modified two-port black box model. This model includes small-signal equivalent circuits of components used for 2.5 Gbps DFB laser modules such as DFB laser, coplanar waveguides, matching resistor, bonding wires, and thermoelectric cooler (TEC). From this equivalent circuit modeling, we show that calculated frequency characteristics of DFB lasers on submount and complete DFB laser modules are similar to their measured frequency characteristics, respectively. Based on this equivalent circuit model, we propose and demonstrate a method that can improve frequency characteristics of 2.5 Gbps DFB laser modules through both experiments and simulations.