一种新颖的电路工作点求解方法

介绍了一种基于数学优化并采用设计方程评估电路性能的ＣＭＯＳ单元模拟电路的自动综合技术。它采用一种新颖的“纹波推进法”来确定电路的静态工作点。并用较高精度的小尺寸ＭＯＳ器件评估器求解ＭＯＳ器件的电学参数。利用本方法实现的几种ＣＭＯＳ单元电路的自动综合程序已经集成到复旦模拟电路自动化设计系统（ＦＤＡＡＤＳ）中。     

改善陷波滤波器Q值的反馈电路

本电路图示出一种带有正反馈电路的６０Ｈｚ陷波滤波器（图１）。如果将选用的缓冲器接在Ａ点和Ｂ点之间来代替短路的话，则确定正反馈的电阻（Ｒ４和Ｒ５）完全与确定陷波频率和陷波深度（Ｒ１、Ｒ２和Ｒ３）的电阻（Ｒ１、Ｒ２、Ｒ３）无关。在本例中（采用缓冲器），应用精确的方程，而Ｆ陷波＝１／（２ｎＣ（３×Ｒ１×Ｒ２）式中，Ｒ１＝ＲＩＡ＋Ｒ１Ｂ和Ｃ１＝Ｃ２＝Ｃ３＝Ｃ。Ｒ３确定陷波的深度，就缓冲情况而言，在Ｒ３＝６（Ｒ１＋Ｒ２）时，产生最大的陷波深度。通过改变系数Ｋ即Ｒ５与（Ｒ４＋Ｒ５）之比，Ｑ就可进行独立调节。…     

基于SRAM的可重配置电路

基于ＳＲＡＭ的可重配置ＰＬＤ（可编程逻辑器 件）的出现,为系统设计者动态改变运行电路中ＰＬＤ的逻辑功能创造了条件。ＰＬＤ使用ＳＲＡＭ单元来保存它的配置数据决定了ＰＬＤ内部互连和功能,改变这些数据,也就改变了器件的逻辑功能。由于ＳＲＡＭ的数据是易失的,因此这些数据必须保存在ＰＬＤ器件以外的ＥＰＲＯＭ,ＥＥＰＲＯＭ或ＦＬＡＳＨ ＲＯＭ等非易失存储器内,以便系统在适当的时候将其下载到ＰＬＤ中,从而实现在电路可重配置ＩＣＲ（Ｉｎ—ＣｉｒｃｕｉｔＲｅｃｏｎｆｉｇｕｒａｂｉｌｉｔｙ,在电路可重配置）。 如何实…     

一种采用数控增益音频放大器的ALC实用电路

本文介绍了美国ＨＡＲＲＩＳ公司短波自适应通信系统中ＲＦ－１３１０Ａ激励器的音频放大单元ＡＬＣ（自动电平控制）电路。该电路采用了数控增益放大技术，与国内目前激励器中相应的ＡＬＣ电路相比较，具有音频控制范围大、音频输出幅度波动小的特点。这一较先进的技术，可供有关线路设计人员借鉴。     

DXC-537P摄像机电路调整

要保持摄像机的最佳性能,必须定期维护和调整,特别是使用时间较长的摄像机。ＳＯＮＹ公司生产的ＤＸＣ－５３７Ｐ摄像机电路调整由以下几个主要部分组成：编码器、伽玛校正、细节校正等。 调整前初始设定： 增益开关：０ ｄＢ;←白平衡开关：预置;←滤色片：１ 号 化妆、细节、快门置ＯＦＦ;调节／工作开关置：调节（ＡＴ－５９板）。１编码器调整 必须首先将编码器调整到标准状态,彩条输出信号符合技术规范。 １）载波平衡调节 摄像机输出开关置彩条。 调节Ｂ－Ｙ箝位电位器（ＲＶ１）和Ｒ－Ｙ箝位电位器（ＲＶ４）,使白束点在矢量…     

来号显示及第三方来号显示解码电路

１２００ｂａｕｄＢｅｌｌ２０２及ＩＴＵ－ＴＶ．２３频移键控Ｆｒｅｑｕｅｎｃｙ－ＮＷ６００２是工作在３Ｖ或５Ｖ的ＣＭＯＳ来号显示及第三方来号显示解码电路。它能接收符合Ｂｅｌｌｃｏｒｅ－ＧＲ３０－ＣＯＲＥ＆ＳＲ－ＴＳＶ－００２４７６、ＢＴＳＩＮ２２７＆一ＳＩＮ２４２及ＣＣＡＴＷ／Ｐ＆Ｅ／３１２标准的信号。ＮＷ６００２提供１２００ｂａｕｄ的Ｂｅｌｌ２０２及ＩＴＵ－ＴＶ．２３ＦＳＫ解码。微控制器可通过二线模式串行接口提取数据。另外,ＮＷ６００２Ｏ为ＢＴ的主叫线路识别显示（Ｃａｌｌｉｎｇ　Ｌｉｎｅ　Ｉｄｅ…     

GaAs DCFL电路研究

给出了对ＤＣＦＬ电路单元的研究，包括电路设计和用先进的Ｐ埋层自对准栅工艺制作电路的实验结果。表明它可以适用于大规模ＧａＡｓＤＣＦＬ电路的设计和制造。     

新颖应用电路.实用电路集

新颖应用电路·实用电路集ＡＮＰ．５７９～５８２５７９．准数字化带通滤波器这个简单的滤波器可以保证在一定的频率范围内（虽然是在初始频率的一半）传输ＴＴＬ信号。在该频率范围之上或之下，该滤波器的输出为一稳定的逻辑电平。通过网络Ｒ２～Ｃ１和Ｒ３～Ｃ２将输入...     

用声表面滤波器作光－光中继器的抽时钟电路

本文对影响３Ｒ光－光三次群光中继器的性能的主要因素抽时钟电路进行了分析研究，介绍了一种新型的声表面滤波器（ＳＡＷＦ）作为抽时钟电路的核心器件，实验由ＳＡＷＦ器件得到的时钟抖动较小，最大时钟抖动为０．３ｕｓ（４．５°），在９连“０”时，时钟性能无明显下降，并具有电路结构简单、调整方便、时钟频率准确等优点。     

Ll－CFAR：灵活而有韧性的替换技术

本文介绍了一类新的恒虚警率（ＣＦＡＲ）处理器。Ｌｌ－ＣＦＡＲ通过线性地从参考装置上滤去分级样本来进行噪声功率的估测，这种组合的权数不仅取决于等级，还依赖于样本和检测单元的相对接近度。从Ｌｌ－ＣＦＡＲ的一大类中，可以选择出（１）能有效地探测出假目标的；（２）能在杂波边界存在的情况下有效地控制虚警的；（３）适用上述两种非均相性情况的具有韧性的方案。当按这些方案进行设计时，其实际工作量并不比单纯的有序统计ＣＦＡＲ（ＯＳ－ＣＦＡＲ）大。本文在对Ｌｌ－ＣＦＡＲ的随机训练进行讨论之后，在所遇到的最普遍的环境条件下，对其性能进行了充分的评估，并且将其性能与传统的ＣＦＡＲ技术的性能作了比较。     

"一般时序电路设计"的课堂教学及实践改革

分析了“数字电路与逻辑设计”课程中“一般时序电路设计”的内容的地位与作用,指出传统教学方法在设计较复杂电路时的局限性,为此完善了教材对该部分内容的讲解,同时设计了一种基于Active—HDL6．1和QUARTUSII4．1软件及可编程逻辑器件FPGA讲授“一般时序电路设计”的教学方法,实践证明该教学方法使用不多的课时就能让学生轻松的掌握复杂数字系统电路的设计。     

基于T形电路的回转器设计方法

提出了一种基于T形电路的回转器实现电路的设计方法。该方法以T形电路为基础,通过修改电路的结构,接入两个电压控制电压源,利用运放电路来实现这两个受控源,给出了一种回转器实现电路的设计过程。给出的设计实例和Multisim电路仿真结果,表明本文方法的有效性。所讨论方法易于理解且具有普遍性,对于回转器以外的其它特定二端口电路的设计也具有一定的启发意义。     

Quantized Probability Circuit Design Principles Applied to Linear Circuits

A circuit design method for linear circuits is needed which will adequately predict circuit per formance as a function of component tolerances. This paper describes a method which weights the probable component variation from its nominal value into one of three groups; the group assignment depends on how seriously the component variation affects over-all performance This technique, identified as the quantized probability design (QPD) method, is compared with the absolute worst case (AWC), the Taylor worst case (TWC), and the uniform probability (UP) methods. The QPD procedure is given, based on the circuit performance equation. Two linear circuit applications are presented and analyzed whic show the effect each component will have on circuit performance. A comparison of design methods shows that the quantized probability design predicts less amplifier gain variation. Actual experience has shown that a closer correlation exists with the quantized probability design method, and therefore its use for linear circuits is recommended.     

MCM-C/D微波基板工艺技术研究

提出了一种新型的MCM-C/D微波基板研制方法,克服了低温LTCC基板微带线耐焊性差及附着力差的缺点。研究了MCM-C/D基板的膜层结构特征及制作过程的工艺控制方法,并给出相应的试验结果,这对于微波电路基板的设计和应用有一定的参考价值。     

An Analog Circuit Fault Characterization Methodology

A methodology for diagnosing and characterizing multiple faults in analog circuits, and results from applying this methodology to a real circuit is presented. Our method is a novel combination of a Simulation Before Test (SBT) and Interpolation After Test (IAT) methodology. Our method uses the classical SBT concept of a fault dictionary database constructed before test. It also uses a method of IAT that consists in using the measurements to guide an interpolation algorithm to effectively increase the local resolution of the fault dictionary database and thereby yield the most likely test parameter value. Our methods underlying principle is to characterize the fault-free and faulty circuit cases by their impulse responses obtained by simulation and subsequently stored in a fault dictionary database. The method uses the technique of Lagrange interpolation to resolve the faults between the fault dictionary database entries and the actual measurements. Our experimental results reveal that the method is effective for characterizing faults when the simulations match the measurements sufficiently. Consequently, the methods effectiveness depends highly on the quality of the models used to build the dictionary as well as on the accuracy of the measurements.Yvan Maidon was born in Bordeaux, France. He received the M.Sc degree in (electronics) applied physics from the University of Bordeaux, in 1980. He is currently Head of the Department for Applied Sciences in Electrical and Electronic Engineering at the University of Bordeaux 1. His special research interests include failure analysis and relaibility of analog circuits. He has also developed original BICS for mixed circuits and SoC testing.Thomas Zimmer is currently Professor at the University of Bordeaux 1. He received the M.Sc. degree in physics from the University of Würzburg, Germany, in 1989 and the Ph.D. degree in electronics from the University of Bordeaux 1, France, in 1992. His research interests include characterization and modeling of high frequency bipolar devices. He has authored and co-authored about 70 scientific and technical publications including several book chapters. He is also co-founder of the start-up company XMOD.André Ivanov is Professor in the Department of Electrical and Computer Engineering, at the University of British Columbia. Prior to joining UBC in 1989, he received his B.Eng. (Hon.), M. Eng., and Ph.D. degrees in Electrical Engineering from McGill University. In 1995–96, he spent a sabbatical leave at PMC-Sierra, Vancouver, BC. He has held invited Professor positions at the University of Montpellier II, the University of Bordeaux I, and Edith Cowan University, in Perth, Australia. His primary research interests lie in the area of integrated circuit testing, design for testability and built-in self-test, for digital, analog and mixed-signal circuits, and systems on a chip (SoCs). He has published widely in these areas and holds several patents in IC design and test. Besides testing, Ivanov has interests in the design and design methodologies of large and complex integrated circuits and SoCs. Ivanov has served and continues to serve on numerous national and international steering, program, and/or organization committees in various capacities. Recently, he was the Program Chair of the 2002 VLSI Test Symposium (VTS 02) and the General Chair for VTS 03 and VTS 04. In 2001, Ivanov co-founded Vector 12, a semiconductor IP company. He has published over 100 papers in conference and journals and holds 4 US patents. Ivanov serves on the Editorial Board of the IEEE Design and Test Magazine, and Kluwers Journal of Electronic Testing: Theory and Applications. Ivanov is currently the Chair of the IEEE Computer Societys Test Technology Technical Council (TTTC). He is a Golden Core Member of the IEEE Computer Society, a Senior Member of the IEEE, a Fellow of the British Columbia Advanced Systems Institute and a Professional Engineer of British Columbia.     

基于比较器的四值电流型CMOS加减电路设计

该文通过对电流型CMOS电路的阈值控制引入了多值电流型比较器。与2值逻辑电路相比,多值逻辑电路的单条导线允许更多的信息传输。相较于电压信号,电流信号易实现加、减等算术运算,在多值逻辑的设计上更加方便。同时提出了基于比较器的4值基本单元设计方法,实现了4值取大、取小以及反向器的设计,在此基础上设计实现了加法器和减法器。该设计方法在2值、3值以及n值逻辑上同样适用。实验结果表明所设计的电路具有正确的逻辑功能,较之相关文献电流型CMOS全加器有更低的功耗和更少的晶体管数。     

一种智能检测系统电路设计

简述了一种智能检测系统电路的设计，具体分析其中超高部分、轨距部分电路、里程部分测量电路、温度部分测量电路的设计，中央处理与A／D转换电路，电源变换电路。     

COPRICSI: COnstraint-PRogrammed Initial Circuit SIzing

This paper presents a new method to automate the sizing of analog circuits. The method emulates the manual design procedure. The sizing task is formulated as a constraint programming problem. Two new algorithms are introduced: First, a hierarchical structural analysis of functional blocks that automatically sets up the analytical equations for the sizing. And second, a heuristic to guide the branching process of a constraint programming solver. We achieve a reproduction of the manual proceeding of designers and at the same time an automation of the set-up of the design problem, reducing the set-up effort to seconds. The method is primarily designed for operational amplifiers. More than 20 circuits, including different variants of two-stage, folded-cascode, telescopic and symmetrical op-amps, are considered at this time. This paper presents a runtime comparison of the newly developed branching heuristic with a generic branching heuristic on 20 different circuits. Furthermore, sizing results for a two-stage op-amp with transistors in weak inversion and a folded-cascode op-amp with common-mode feedback circuit are presented to show the effectiveness of the approach.     

开关电源的过载保护电路设计

基于UC3842的反激式开关电源,文中从原理和实验两方面分析了恒功率控制和恒电流控制的过载保护电路,阐述了各自的特点,并提出了一种适用于短暂过载场合的延时锁定关断过载保护电路,实验证明此电路工作于保护模式时开关元件无开关应力,为高峰值负载电源过载保护电路的设计提供了一种有效的方法。     

使用MATLAB软件的符号电路分析

笔者用MATLAB语言编写的一种符号电路分析程序,该程序具有其 简单的文本输入格式,能有效地进行电阻电路分析、正弦稳态分析和复频域电路分析。实例显示,符号电路分析在教学和工程电路吉具极其重要的应用价值。在本科和研究生教育中推广使用MATLAB软件,在提高教学水平的同时,还会对教学方法产生一定的影响。