时钟电路、倍频器、分频器、混频器、变频器、移相器

0623091一种新型铁电体移相器[刊,中]/周雁翎//雷达科学与技术．—2006,4(3)．—189-192(D)介绍了一种用于相控阵雷达的新型铁电体移相器,利用有限元方法对铁电体材料加载波导移相器进行了分析,给出了计算结果。最后讨论了铁电体移相器设计中几个值得关注的重要问题。参4 0623092台达V系列变频器转矩控制模式的技术应用[刊,中]/张硕//单片机与嵌入式系统应用．—2006,(7)．—84-85(C) 0623093可编程数字解调分析模块的设计应用[刊,中]/史英春//系统工程与电子技术．—2006,28(6)．—807-808,928(E)利用数字下变频器HSP50214B同TMS320C5409 DSP的配合,设计了一种可编程的数字解调分析模块,通过软件编程实现对不同调制样式信号的解调和分析,最后给出了该模块在数字监测接收系统中的应用。实验证明该模块在无线电接收系统中有着很强的实用     

网络、滤波、滤波器、限幅器、斩波器

IELDVD060:9286:29507-634 0603592 基于电流差分隔离放大器(CDBA)的电流模式滤波器 =Current differencing buffered amplifier(CDBA)based     

倍频器、分频器、混频器、变频器、移相器

Y20O2·63088·65 0215313模拟电路的多故障诊断法=Amethedformultiplefaultdiagnsis in analog Cireuits〔会,英〕/Starzyk,J .A.&Liu,D.//Proceedin郎of the 33rd助utheastems卿因-苗um on System Theo甲一65一68(PE)Y2002·63118·25 0215314用浮动栅MOS电路设计模拟和数字比较器=Designsof ana〕09。nd山giral。omparators with FGMOS(会,英〕/Nandhasri,K.&Ngarmnil,J.//2001 IEEE Interna-如n目S帅工洲〕sium on Circuits ands邓tems,Vol.1 of5,一25一28(HE)Y2002·63118。117 0215315开关CMOS混频器的直接下变频二…     

倍频器、分频器、混频器、变频器、移相器

Y99-61822-85 2002135毫米波和亚毫米波振荡器的全光学实现用的集成光学光子混频器=Integrated optics photonic mixer for an all-optical implementation of a millimeter and sub-millimeterwave oscillator[会,英]/Dubovitsky,S.& Chuyanov,V.//International Topical Meeting on Microwave Pho-tonics.—85～86(UC)     

倍频器、分频器、混频器、变频器、移相器

Y2000-62085-299 0009527分布式微电子机械系统移相器的最佳化=Optimiza-tion of distributed MEMS phase shifters[会,英]/Barker,N.S.& Rebeiz,G.M.//1999 IEEE MTT-S Interna-tional Microwave Symposium,Vol.1.—299～302(UC)     

调制器、解调器、检波器、鉴相器、移相器

0609065飞秒强激光作用下电子振荡导致的谐波辐射频谱的展宽和红移〔刊,中〕/田友伟//强激光与粒子束.—2005,17(12).—1761-1764(E)0609066具有双驱动电极运行在1.55μm波长的光子感应电光聚合物调制器=Photo-blaching induced electro-opticpolymer modulators with dual driving electrodes operatingat1.55μm wavelength〔刊,英〕/SeongKu Ki m,K.Ger-ay//Electronics Letters.—2003,39(18).—1321-1322(E)0609067光纤-无线电应用的简单单边带光调制器=Si mple op-tical single-sideband modulator for fibre-radio applications…     

倍频器、分频器、混频器、变频器、移相器

Y98-61351-1172 99060291.9GHz CMOS 射频下变频器=A 1.9GHz CMOS RFdown-conversion mixer[会,英]/Kilicaslan,H.& Kim,H.-S.//1997 IEEE 40th Midwest Symposium on Cir-cuits and Systems,Vol.2.—1172～1174(HG)本文研究了采用0.5μm CMOS 工艺的1.9GHz 下变频器,它基于吉伯(Gilbert)单元,采用共栅输入级,而不是共源输入级,以便于调节输入阻抗。该混频器芯片上还有带螺旋线形电感器的匹配网络,并用 MIM电容器来增加匹配网络的选择性和降低噪声,文章还说明了它有3.35dB 变换增益和9.04dB 噪声特性,给出了用2.5V 电源电压进行模拟的结果。参8     

倍频器、分频器、混频器、变频器、移相器

9915235串接二分支分频器[刊]/高淑敏//广播与电视技术.一1999,26(4).—127～130(L)为了解决城市中电视图像质量下降、农村电视信号弱及广播、调频信号接收困难等问题,采用了共用天线广播、电视、调频系统,共用天线广播、电视系统及共用天线电视、调频系统等接收方式。本文介绍这些共用天线系统中串接二分支分频器的用途、工作原理、电原理图、技术指标、元件参数的选择,并讲述了制作、调试方法及其应用。参3     

网络、滤波、滤波器、限幅器、斩波器

0608992超宽带非周期信号等效采样的研究〔刊,中〕/李熹//电测与仪表.—2005,42(12).—45-49,38(D)对超宽带窄脉冲信号需要进行高速采样才能有效采集,等效采样是一种实现超高速采样的有效手段。经过了时间间隔调制的超宽带脉冲串信号已经不是周期信号,而传统的等效采样一般都是以被采集信号的周期为前提的。提出了一种对于超宽带非周期信号等效采样的新方法,并对设计出的电路进行测试,得出了理想的测试结果。参50608993基于FIR滤波器组的DFT算法=DFTalgorithmbasedon FIR filter banks〔刊,英〕/E.V.Papoulis and T.Stathaki//Elect…     

倍频器、分频器、混频器、变频器、移相器

Y2000-62085-117 0005938利用噪声系数的分析公式设计超低噪声混频器的方法=Design of ultra low noise mixer using an analytical for-     

GEMNET: a generalized, shuffle-exchange-based, regular, scalable,modular, multihop, WDM lightwave network

GEMNET is a generalization of shuffle-exchange networks and it can represent a family of network structures (including ShuffleNet and de Bruijn graph) for an arbitrary number of nodes. GEMNET employs a regular interconnection graph with highly desirable properties such as small nodal degree, simple routing, small diameter, and growth capability (viz. scalability). GEMNET can serve as a logical (virtual), packet-switched, multihop topology which can be employed for constructing the next generation of lightwave networks using wavelength-division multiplexing (WDM). Various properties of GEMNET are studied     

Thermodynamics of copper matte converting: Part III. Steady-state volatilization of Au,Ag, Pb,Zn, Ni,Se, Te,Bi, Sb,and As from slag,matte, and metallic copper

A comprehensive compilation of various thermodynamic data required for a complete analysis of copper matte converting reactions is presented. The data comprise estimated free energies of formation for such gases as SeO, SeS, TeO, TeS, BiO, BiS, SbO, SbS, AsO, and AsS, as well as activity coefficients in dilute copper alloys and vapor pressures of various elements and compounds. The volatilization of minor elements in steady-state reactors comprising gas and several condensed phases is mathematically formulated, and a parameter which governs the volatilization in such reactors is defined and named volatilization constant. The vapor pressures of various volatile species are calculated thermodynamically for the Noranda Process reactor by assuming equilibrium conditions. The volatilization constants of various minor elements are expressed explicitly as functions of oxygen and sulfur activities. Formerly Associate Professor, Department of Metallurgical Engineering, University of Utah, Salt Lake City, UT     

Novel planar, square-shaped, dielectric-waveguide, single-, and dual-mode filters

This paper presents a novel concept of a square-shaped dielectric-waveguide resonator, which can easily realize a dielectric-waveguide cross-coupled filter or a dielectric-waveguide dual-mode filter, using the conventional printed circuit board (PCB) process. This planar dielectric-waveguide resonator has a higher Q value than a microstrip resonator. The physical mechanisms of both single- and dual-mode filters are elucidated. Some new coupling structures are developed for undergoing the PCB process. Filter design procedures are detailed. Design curves for the coupling coefficients of internal- and external-coupling structures are determined by full-wave finite-element-method electromagnetic calculations. Measurement results are highly consistent with theory for all trial filters. This study offers an effective means of producing low-cost high-performance planar circuit filters.     

Bits, symbols, bauds, and bandwidth

The use of clear, concise, and unambiguous language in telecommunications engineering is vital to communicate a desired meaning and understanding. Terminology should be based on rigorous engineering principles and traceable to well known and dependable sources. This article deals with four everyday terms commonly encountered in the popular semi-technical press as well as in serious engineering periodicals. The misuse of these and other terms can lead to low-balled cost proposals, court litigation, and patent infringement cases. Imagine how an engineering student can be confused when she/he typically encounters bandwidth measured in bits per second     

PBX技术.市态.营销.选购

本文介绍了ＰＢＸ交换机的技术及市场需求态势。并提出ＰＢＸ产品的营销要素及其用户在选购时应遵循的原则。     

Dilemmas,uncertainty, risks,and board performance

This paper traces the origins of the words risk, uncertainty, governance and development and argues that a deeper understanding of each allows more effective decision taking in the boardroom. It argues that the role of the board of directors is to balance and rebalance continuously their irresolvable dilemma — ‘how do we drive our enterprise forward while keeping it under prudent control?’ It argues that it is the board’s role to focus on uncertainty, rather than risk, and this requires a different set of intellectual skills from board members to be able to cope with monitoring a range of diverse scenarios. This is crucial for a board to develop stronger ways of both leading their organisation and of ensuring the connectedness of the learning within and between the board and the operational unit’s risk taking. It advocates that to achieve this a board must develop new ways of learning — especially of thinking strategically and becoming more sensitised to the dynamics of their changing external environments. This will take them well beyond the comforts of their specialist managerial disciplines and into the true world of directing. The paper demonstrates the importance of continuous learning in reducing organisational uncertainty and risk. It uses the ‘Learning Board’ process and model as the central processor of both strategic and operational learning to create an annual rhythm for the board’s year.