倒装芯片及其常见的形式

近年来标准表面贴装元器件的引脚节距大幅度地降低,对表面贴装工业带来了重新整合的冲击。传统的2.5至1.25mm(100至50mil)引脚节距的元器件被0.5mm(20mil)节距的元器件所替代(见图1所示)。现如今的趋势是愈来愈多的印刷电路板制造厂商将工艺定位在0.4mm(16mil)引脚节距的标准表面贴装元器件上。另外,先进的组装技术,例如:载带自动键合(tapeautomated bonding简称TAB)技术,已经将引脚的节距降低到0.2mm(8mil)甚至更小。     

芯片互连超声键合技术连接机制探讨

超声键合是实现集成电路封装中芯片互连的关键技术之一.对于超声键合过程焊点形成机理以及超声在键合过程中发挥的作用的正确理解是实现参数优化和获得可靠焊点的关键.综述了超声键合技术连接机理,归纳总结并探讨了四种键合机制,包括:摩擦生热键合理论、位错理论、滑动摩擦及变形理论和微滑移理论.     

多芯片组件组装技术

多芯片组件（ＭＣＭ）的组装技术是制造ＭＣＭ的关键技术，本文主要介绍了芯片也基板、基板与外壳的连接技术。     

微环形调制器使得芯片大小的光连接成为可能

无晶圆公司Luxtera（Carlsbad,CA）开发了一种旨在解决高速芯片间接口问题的技术,现已生产出半径只有30mm的可编程10Gb/s的光纤环形调制器.在同样的数据速率下,采用这种技术的器件尺寸比电驱动器小很多,工程师就可以在大批量的CMOS芯片上直接造出宽带光接口.     

多芯片组件（MCM）技术

对日益广泛采用的多芯片组件（ＭＣＭ）技术的基本构成、基本类型、芯片安装／内连接、测试与诊断等作了较系统的介绍。     

第四十四届国际电子元件与技术会议论文摘要（一）

001 可控塌陷芯片连接(C4)——一种正在实现的技术；002 粘结倒装芯片装配用的柔性凸点；003 C-4／BAO与其它可选择的MLC单芯片封装的比较；004 用于CM06微处理器的高密度C4／CBOA互连技术；005 低成本陶瓷薄膜球形触点阵列；006 用于倒装芯片的1024脚塑封球形触点阵列；     

新品方案

中星微推出“星光移动一号”中星微电子近日宣布推出引领3G音乐应用突破的芯片产品“星光移动一号”,成功实现了以硬件方式解决软件播放问题,大大降低了手机多媒体的制造和应用成本。“星光移动一号”采用中星微先进的VMD技术,拥有全部自主知识产权,以64和弦做背景音乐,把音乐的合成和真人真唱的声音有机合成在一起,使手机铃声从芯片这一硬件层面上实现了真人真唱,彻底改变了目前只能从软件处理的方式实现真唱铃声的单一方式。目前,联想、三星、TCL、首信等国内外20余家手机厂商都已在最新型的产品上采用了“星光移动一号”。中国首颗完…     

SMSC的芯片间连接技术已授权给AMD公司

SMSC公司近日宣布,AMD已获得SMSC的专利芯片间连接（Inter-ChipConnectivity,ICC）技术授权。     

导热金刚石同大尺寸芯片的低温烧结银连接工艺

通过高导热银浆实现了连接大面积(>100 mm²)半导体硅片和金刚石的低温低压烧结技术。通过对金刚石表面镀覆金属薄膜,增强同烧结银界面处固态原子扩散,开发了商用烧结银膏在200℃下低温烧结工艺,得到金刚石-硅的均匀连接界面,计算得到孔隙率约为9.88%,中间烧结银层等效热阻约为1.38×10^-5m²·K/W。     

“通信原理”大作业教学的探索与实践

本文结合我系"通信原理"课程的教学实践情况,从内容的安排和开展的形式等方面介绍了一种新颖的大作业形式,并通过实例阐述了该作业形式对于提升课程教学效果所起到的积极作用。由师生的反馈以及教学实践中收到的良好效果表明,大作业作为"通信原理"课程辅助教学的一种新形式,有助于教学质量的提高,对学生研究性学习能力的培养起到积极作用,值得进一步完善和推广。     

On arithmetic weight for a general radix representation of integers (Corresp.)

In this correspondence we define a "nonadjacent form" for integers in an arbitrary radixr > 1. This form is proved to be unique, and the arithmetic weight of an integer is shown to be equal to the number of nonzero terms in the form. Two algorithms are presented for the computation of this form. Ifr = 2, our form coincides with the well-known modified binary nonadjacent form.     

Cascade lattice IIR adaptive filters

The feedback lattice filter forms, including the two-multiplier form and the normalized form, are examined with respect to their relationships to the feedback direct form filter. Specifically, the transformation matrix between the lattice forms and the direct form is derived; parameter and state relationships between the lattice forms and the direct form are therefore obtained. An IIR filter structure-the cascade lattice IIR structure-is constructed. Based on this structure, three IIR adaptive filtering algorithms in the two-multiplier form can then be developed following the gradient approach, the Steiglitz-McBride approach and the hyperstability approach. Convergence of these algorithms is theoretically analyzed using either the ODE approach or the hyperstability theorem. These algorithms are then simplified into forms computationally as efficient as their corresponding direct form algorithms. Relationships of the simplified algorithms to the direct form algorithms are also studied, which disclose a consistency in algorithm structure regardless of the filter form. Three normalized lattice algorithms can also be derived from the two-multiplier lattice algorithms. Experimental results show much improved performance of the normalized lattice algorithms over the two-multiplier lattice algorithms and the direct form algorithms     

SDH管理网中的网络地址格式解析

文中详细介绍了网络地址格式 ,内容包括 :网络地址格式的 OSI分层模型基础、格式主体部分分析、地址格式详细解析 ,最后以实例对管理网络中的地址格式应用进行了说明。     

Antitumor activity of Ca-double-stranded RNA from sodium nucleinate

Ca-dsRNA introduced in the concentration of 5 micrograms per mouse 24 hours before the MG22a mouse hepatoma transplantation causes the 70% inhibition of the hepatoma growth. The sodium nucleinate used in the considerably higher concentration had a less effect. The sodium form of dsRNA also had a less antitumour effect comparing with its calcium form. The calcium form of dsRNA proves to be relatively stable and physiologically active form of dsRNA during its parenteral administration.     

Using parallel resonators to create improved maximally flatquarter-wavelength transformer impedance-matching networks

This paper presents a general approach for designing maximally flat quarter-wave transformer impedance-matching networks (QWT-IMNs) used in conjunction with parallel resonators. The approach used finds a maximally flat form by setting lower order terms of the general form to zero. This general form is found using ABCD matrices. The resulting maximally flat form is identical to the form for quarter-wavelength-coupled filters. Using parallel resonators improves QWT-IMN designs in three ways. First, adding parallel resonators to a QWT-IMN improves the poor stopband rejection from which QWT-IMN's suffer. Second, for a given load-to-source mismatch, a QWT-IMN has a fixed response, i.e., a fixed total Q. By using more than one parallel resonator, numerous response realizations, i.e., values of total Q, can be achieved for a given load-to-source mismatch. Third, using parallel resonators requires one less quarter-wave transformer to achieve the same order of response     

Phase-variable canonical form for time-varying multivariable systems

For time-varying multivariable systems, a phase-variable canonical form is presented. In comparison with the form of Luenberger (for time-invariant systems), the present f?rm is simpler in its structure and requires less computational effort for its determination. This simplification is due to a suitable choice of the order of the subsystems in the phase-variable form. This choice permits a useful subdivision of the control-lability matrix, which serves as the transformation matrix. In this way it is possible to compute directly the coefficients of the phase-variable form using matrices only of the order of the subsystem.     

利用喇曼-米方法确定激光雷达几何因子

为了快速合理地确定激光雷达几何因子反演关键参量激光雷达比,利用雷达充满区几何因子值恒为1的属性提出一个简捷的新途径,对这种方法从理论上进行了推导,并以实际雷达数据进行了验证,反演得到的几何因子在充满区没有出现单调增加或者单调减小等不合理情况。结果表明,这种方法避免了目前激光雷达比需多次取值对结果定性分析繁琐耗时的不足,是合理有效的。这将对于反演出雷达几何因子并进而获得近地面气溶胶信息具有重要参考价值。     

Address selection by combinatorial decoding of semiconductor memory arrays

On-chip decoding for address selection is being designed into large- capacity semiconductor memory chips to reduce the number of off-chip interconnections. A combinatorial form of decoding is offered as an alternative to the usual straight binary or selection matrix form of decoding. Combinatorial decoding circuit complexity and pad reduction, and provides an easy method of selecting a redundant line on the chip. This form of decoding uses the (/SUB m//SUP n/) combinations of n bits taken m at a time, whereas the usual binary decoding uses 2/SUP n/ combinations. Because most systems are organized in binary form, a code conversion is required to use the combinatorial form of address decoding. Since the code conversion is equivalent to a level of decoding, there is only a small logic penalty to pay.     

Dependence of linewidth in hexagonal planar ferrites on angle between magnetostatic field and easy plane

Theoretical expressions for the linewidth of a single-crystal hexagonal planar sphere are compared with experimental results with the magnetostatic field taken at an arbitrary direction to the easy plane. It is shown that the overall line-width broadening favours the Bloch-Bloembergen form of damping, in comparison with the Landau-Lifshitz form. As the large anisotropy field is represented in a form identical to a shape-demagnetising field, the results indicate the dependence of the linewidth on the shape of the sample.