硅集成电感元件的分析、设计与优化

利用采用FDTD(finite-difference time-domain method)方法的计算软件ISE-EMLAB对片上集成电感进行了模拟,并分析了电感的金属宽度、金属间隔、线圈外直径、线圈匝数等设计参数对电感的品质因数、电感值、电阻值等参数的频率特性的影响,进而提出了一种应用于片上集成电感的优化设计的方法.     

硅集成电感元件的分析、设计与优化

利用采用FDTD (finite-difference time-domain method) 方法的计算软件ISE-EMLAB对片上集成电感进行了模拟，并分析了电感的金属宽度、金属间隔、线圈外直径、线圈匝数等设计参数对电感的品质因数、电感值、电阻值等参数的频率特性的影响，进而提出了一种应用于片上集成电感的优化设计的方法.     

新颖的常规硅工艺实现的侧向螺线型片上集成电感

提出了一种用常规硅工艺实现的片上集成电感的螺线型新结构．制造工艺使用标准双层金属布线的常规硅工艺．测量了螺线型集成电感的S参数，从测量数据计算了集成电感的参量．实验的侧向螺线型片上集成电感的Q值峰值为1.3，电感量为22nH．对用两层金属层实现的侧向螺线型片上集成电感和单层金属的常规平面螺旋电感的实验结果进行了比较，电感量和Q值与常规平面螺旋电感有可比性．     

新颖的常规硅工艺实现的侧向螺线型片上集成电感

提出了一种用常规硅工艺实现的片上集成电感的螺线型新结构．制造工艺使用标准双层金属布线的常规硅工艺．测量了螺线型集成电感的S参数，从测量数据计算了集成电感的参量．实验的侧向螺线型片上集成电感的Q值峰值为1.3，电感量为22nH．对用两层金属层实现的侧向螺线型片上集成电感和单层金属的常规平面螺旋电感的实验结果进行了比较，电感量和Q值与常规平面螺旋电感有可比性．     

新颖的常规硅工艺实现的侧向螺线型征上集成电感

提出了一种用常规硅工艺实现的片上集成电感的螺线型新结构。制造工艺使用标准双层金属布线的常规硅工艺。测量了螺线型集成电感的S参数，从测量数据计算了集成电感的参量。实验的侧向螺线型片上集成电感的Q值峰值为1.3，电感量为2.2nH。对用两层金属层实现的侧向螺线片上集成电感和单层金属的常规平面螺旋电感的实验结果进行了比较，电感量和Q值与常规平面螺旋电感有可比性。     

影响集成电感性能的关键因素

片上集成电感是单片集成射频电路、微波电路及光电集成电路中不可缺少的重要元件。高Q值的片上集成电感是IC工作者追求的目标。衬底损耗和金属损耗一直被认为是限制集成电感品质的主要因素,文中实例为证,在尽量消除衬底损耗和减小金属损耗条件下。得出它们并不是片上集成电感的决定性限制因素。本文从电感的定义出发,得出电感螺旋线之间磁通量的相互抵消是集成电感不能获得高Q值的决定因素。并通过螺旋电感的模拟计算和结合已有的实验,对此论点进行了论证。     

硅基CoZrO铁氧体磁膜结构RF集成微电感

制作了一种新型磁膜结构射频集成微电感.该电感使用溶胶-凝胶法制备的CoZrO铁氧体作为磁性薄膜;采用平面单匝形式的金属线圈,从而形成"SiO2绝缘层/磁膜层(CoZrO)/SiO2绝缘层/Cu线圈"的结构,具有结构简单、制作工艺与常规集成工艺兼容等特点.同时,采用相同工艺同批制作了无磁膜微电感作为对比样品,并取各项结构参数与磁膜电感相一致.测试结果表明,2GHz处,磁膜结构微电感的感值(L)为1.75nH、品质因数(Q)为18.5,与无磁膜微电感相比,L和Q的值分别提高了25%和23%.     

硅基COZrO铁氧体磁膜结构RF集成微电感

制作了一种新型磁膜结构射频集成微电感.该电感使用溶胶-凝胶法制备的CoZrO铁氧体作为磁性薄膜;采用平面单匝形式的金属线圈,从而形成"SiO2绝缘层/磁膜层(CoZrO)/SiO2绝缘层/Cu线圈"的结构,具有结构简单、制作工艺与常规集成工艺兼容等特点.同时,采用相同工艺同批制作了无磁膜微电感作为对比样品,并取各项结构参数与磁膜电感相一致.测试结果表明,2GHz处,磁膜结构微电感的感值(L)为1.75nH、品质因数(Q)为18.5,与无磁膜微电感相比,L和Q的值分别提高了25%和23%.     

渐变悬浮电感参数化模型的仿真设计分析

针对目前片上电感无法同时提高品质因数和电感值的问题,设计了渐变悬浮电感参数化模型,研究了金属线宽及线圈间距的变化对电感性能的影响。进一步将其与双层电感模型相结合,利用HFSS软件仿真分析得到,双层渐变悬浮电感可兼顾磁场损耗、寄生电容、线圈互感等因素,同时大幅度提高品质因数和电感值,品质因数、电感值分别可达24. 66,118n H,较传统单层悬浮电感分别提高48%,436%。结果还表明上层线圈逆时针旋转0. 4°,其品质因数可提高4. 11%。     

应用于无线收发机前端的片上螺旋型电感的研究

这篇文章探讨了在现在的标准工艺条件下片上集成电感的设计和分析问题,包括片上螺旋型电感的有关版图、损耗机制、模型和参数提取问题,最后以一种被学术界广泛接受的模拟工具对电感的有关设计进行了模拟,给出了模拟结果,并进行了分析,给出了设计片上电感应遵循的原则.随着工艺技术和人们对电感的寄生效应的认识的加深,可以相信片上集成电感在高频电路中的应用将越来越广泛.     

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     

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     

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.     

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.