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Numerical Simulation of Capillary and Fluid Dynamic Forces on Tiny Chips in Fluidic Self-Assembly Process 流体自组装过程中微晶片毛细管力和流体动力的数值模拟
Pub Date : 2006-04-24 DOI: 10.1109/ESIME.2006.1643995
A. Tay, Hua Li, Xiangyang Gao, J. Chen, V. Kripesh
Fluidic self-assembly processes have been recently demonstrated to be a feasible method of assembling tiny chips in a cost-effective manner. In order to successfully implement the fluidic self-assembly process, it is important to quantify the magnitudes of the restoring capillary force and torque between the chip and the binding site and to determine the fluid dynamic forces acting on the chip as fluid flows over the chip. This paper presents results of numerical simulations of these restoring capillary forces and torques, and discusses the effect of various parameters on them, such as lubricant volume, component orientation and contact angle. The results show that the restoring forces in both lift and shift directions decrease significantly with the volume of lubricant. Analysis of the sensitivity of the restoring torque to the contact angle between the lubricant and the self-assembled monolayer (SAM) in water is also carried out. It is observed that, at smaller contact angles, the maximum torque is insensitive to the contact angle between 0 to 40deg. It thus suggests that a lubricant with a contact angle less than 40 degrees can be used without loss of effectiveness. The equilibrium of the chip under the action of flow-induced and capillary forces has also been analysed
流体自组装工艺最近被证明是一种具有成本效益的组装微型芯片的可行方法。为了成功地实现流体自组装过程,重要的是量化芯片与结合位点之间的恢复毛细力和扭矩的大小,并确定流体流过芯片时作用在芯片上的流体动力学力。本文给出了这些恢复毛细力和扭矩的数值模拟结果,并讨论了润滑剂体积、部件取向和接触角等参数对它们的影响。结果表明,随着润滑油体积的增加,升力和位移方向的恢复力都显著减小。分析了恢复力矩对润滑油与水中自组装单层膜(SAM)接触角的敏感性。观察到,在较小的接触角下,最大转矩对0 ~ 40°的接触角不敏感。因此,可以使用接触角小于40度的润滑剂而不会失去效果。分析了流诱导力和毛细力作用下的切屑平衡
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引用次数: 2
Numerical Examination and Experimental Verification of Thermal Performance of Board-level QFP with Unattached Drop-in Heat Spreader 板级无附着式散热器QFP热性能的数值研究与实验验证
Pub Date : 2006-04-24 DOI: 10.1109/ESIME.2006.1643950
Y. Lai, T. Wang, Chang-Chi Lee, Hsuan-Yu Chen
In this paper, we evaluate the board-level thermal performance of QFP with an unattached drop-in heat spreader numerically and experimentally. The die is given a power dissipation and induced thermomechanical deformations and the gap distribution on the unattached interface are calculated through the three-dimensional thermal-mechanical coupling analysis incorporated with the contact methodology. The measured junction to ambient thermal resistance is used to validate the numerical results, which involve different interfacial thermal transfer conditions
本文用数值方法和实验方法对带无附着式散热片的QFP板级热性能进行了评价。通过结合接触法的三维热-力耦合分析,计算了模具的功耗和热变形,并计算了非附着界面上的间隙分布。在不同的界面传热条件下,利用实测结对环境热阻的影响对数值结果进行了验证
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引用次数: 1
Modeling and Simulation of Ferrite and Varistor EMI Suppressors 铁氧体和压敏电阻电磁干扰抑制器的建模与仿真
Pub Date : 2006-04-24 DOI: 10.1109/ESIME.2006.1644035
M. Damnjanović, G. Stojanović, L. Zivanov
In this paper, modeling and simulation of electrical characteristics of EMI suppressors will be presented. Ferrite and varistor EMI suppressors consist of conductive layers embedded in ferrite or varistor monolithic structure, which make them very suitable for elimination of conducted EMI. In this paper software tool for calculation of electrical characteristics of ferrite and varistor EMI suppressor is given. A scalable analytical model of different EMI suppressor structures suitable for design and circuit simulations is presented. By using our algorithm, we are able to predict correctly all variations of electrical characteristics introduced by varying geometry parameters of EMI suppressor. These integrated passive devices were tested in the frequency range 1MHz-3GHz using an Agilent 4287A RF LCR meter. The measurements confirm the validity of the analytical model
本文将对电磁干扰抑制器的电气特性进行建模和仿真。铁氧体和压敏电阻电磁干扰抑制器由嵌入在铁氧体或压敏电阻单片结构中的导电层组成,这使得它们非常适合消除传导电磁干扰。本文给出了计算铁氧体和压敏电阻电磁干扰抑制器电学特性的软件工具。提出了适用于设计和电路仿真的不同电磁干扰抑制结构的可扩展分析模型。利用该算法,我们能够准确预测由电磁干扰抑制器几何参数变化引起的所有电特性变化。这些集成的无源器件使用安捷伦4287A射频LCR表在1MHz-3GHz频率范围内进行了测试。测量结果证实了分析模型的有效性
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引用次数: 0
Comparison Between Simulated and Experimental Thermal Resistances of Power Devices Using an Specific Test Chip 基于特定测试芯片的功率器件模拟与实验热阻比较
Pub Date : 2006-04-24 DOI: 10.1109/ESIME.2006.1644034
X. Jordà, M. Vellvehí, F. Madrid, J. Gálvez, P. Godignon, J. Millán
Thermal simulation is nowadays the basic thermal management design tool to predict temperature distributions and power fluxes of complex assemblies. Nevertheless, the simulation results can be inaccurate due to the uncertainty of the values of the parameters involved in the modelisation, as it is the case of the dielectric layer of the IMS substrates. We propose a methodology for the in-situ measurement of the thermal conductivity of this dielectric layer. Two typical power assembly structures based on two types of substrates and a thermal assessment chip, have been simulated and their thermal resistance deduced. The corresponding experimental results have validated the simulations and, consequently, the thermal conductivity extraction method proposed
热模拟是目前预测复杂组件温度分布和功率通量的基本热管理设计工具。然而,由于建模中涉及的参数值的不确定性,模拟结果可能是不准确的,因为它是IMS基板的介电层的情况。我们提出了一种原位测量该介电层导热系数的方法。对基于两种衬底和热评估芯片的两种典型电源组件结构进行了仿真,并推导了其热阻。相应的实验结果验证了模拟结果,从而验证了所提出的热导率提取方法
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引用次数: 5
Fatigue and Thermal Fatigue Damage Analysis of Thin Metal Films 金属薄膜的疲劳和热疲劳损伤分析
Pub Date : 2006-04-24 DOI: 10.1109/ESIME.2006.1644037
Guangping Zhang, C. Volkert, R. Schwaiger, R. Mönig, Oliver Kraft
In this paper, we summarize several testing methods that are currently available for the characterization of fatigue properties of thin metal films. Using these testing methods, a number of experimental investigations of the fatigue and thermal fatigue of metal films with thicknesses ranging from micrometers to sub-micrometers are described. Extensive experimental observations as well as theoretical analyses reveal that the damage behavior, i.e. typical fatigue extrusions and cracking, are quite different from that of bulk materials, and are controlled by the length scales of the materials. Due to the high surface to volume ratio of thin films interface-induced and diffusion-related damage are prevalent in these small length scale materials. As a result, interfaces pose a serious threat to the reliability of thin films
本文综述了目前用于表征金属薄膜疲劳性能的几种测试方法。使用这些测试方法,描述了厚度从微米到亚微米的金属薄膜的疲劳和热疲劳的一些实验研究。大量的实验观察和理论分析表明,典型的疲劳挤压和裂纹损伤行为与块体材料的损伤行为有很大的不同,并且受材料长度尺度的控制。由于薄膜的高表面体积比,界面损伤和扩散损伤在这些小尺寸材料中普遍存在。因此,界面对薄膜的可靠性构成了严重的威胁
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引用次数: 71
Analytical and Numerical Analysis of Drop Impact Behavior for a Portable Electronic Device 便携式电子设备跌落冲击特性的解析与数值分析
Pub Date : 2006-04-24 DOI: 10.1109/ESIME.2006.1644050
Jiang Zhou, K. Sharan, S. Lahoti
Dynamic performance during drop impact is a great concern to semiconductor and electronic product manufacturers, especially for portable devices such as mobile phones. In this paper, the drop impact response of a mobile phone is investigated by an analytical dynamics model. In order to capture some most important affected factors, we decouple this problem to be a two-step analysis. First, finite element analysis is used to determine the effective stiffness for housing and PCB board, respectively. Second, a two-degree-of-freedom analytical dynamic model is developed to investigate the drop impact response. Such an approach allows parametric analysis to determine the important design parameters, which are important to the preliminary selection of geometries and materials of PCB boards and stiffness of housings so that the dynamic stability is maintained. Board level finite element analysis is also performed using input-acceleration model. The results are in good agreement with the analytical model results developed above. Finally, both methods are applied to evaluate the dynamic response of a commercially used cellular phone
跌落冲击时的动态性能是半导体和电子产品制造商非常关注的问题,特别是对于移动电话等便携式设备。本文采用分析动力学模型研究了手机的跌落冲击响应。为了捕获一些最重要的影响因素,我们将这个问题解耦为两步分析。首先,采用有限元分析方法分别确定了壳体和PCB板的有效刚度。其次,建立了一个两自由度的分析动力学模型来研究跌落冲击响应。这种方法可以通过参数分析来确定重要的设计参数,这些参数对于PCB板的几何形状和材料的初步选择以及外壳的刚度,从而保持动态稳定性都是很重要的。板级有限元分析也使用输入加速模型进行。结果与上述分析模型的结果吻合较好。最后,将这两种方法应用于商用手机的动态响应评价
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引用次数: 9
Thermo-Mechanical Modeling of Plastic-Core Solder Balls in LTCC/BGA Assemblies LTCC/BGA组件中塑料芯焊料球的热力学建模
Pub Date : 2006-04-24 DOI: 10.1109/ESIME.2006.1644003
J. Anttonen, T. Kangasvieri, O. Nousiainen, J. Putaala, J. Vahakangas
In this paper, a reliability modeling methodology for BGA solder joints with plastic-core solder balls (PCSBs) has been presented. The methodology is applied to predict the board-level reliability of LTCC/BGA modules under accelerated thermal cycling conditions. The model takes into account both time- and temperature-dependent as well as time-independent plasticity and provides a detailed number of cycles needed to crack initiation, propagation and eventual solder joint failure. To assess the feasibility of the presented modeling procedure, the model is validated against experimental temperature cycling data obtained from LTCC/BGA module assemblies on a printed wiring board. The results demonstrate that this procedure can be used for life-time prediction of BGA solder joints with PCSBs
本文提出了一种塑料芯焊料球BGA焊点的可靠性建模方法。将该方法应用于LTCC/BGA模块在加速热循环条件下的板级可靠性预测。该模型考虑了与时间和温度相关以及与时间无关的塑性,并提供了裂纹萌生、扩展和最终焊点失效所需的详细循环次数。为了评估所提出的建模过程的可行性,根据从印刷电路板上的LTCC/BGA模块组件获得的实验温度循环数据验证了该模型。结果表明,该方法可用于PCSBs BGA焊点的寿命预测
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引用次数: 1
Electromechanical Model of a Multi-Layer Piezoelectric Cantilever 多层压电悬臂梁的机电模型
Pub Date : 2006-04-24 DOI: 10.1109/ESIME.2006.1644024
J. Brufau-Penella, M. Puig-Vidal
In this paper the constituent equations that describe the behavior of a multi-layer piezoelectric cantilever on the coupled electronic and mechanical domain are presented. The study is based on the modal analysis of the partial differential equations governing the motion of an Euler-Bernoulli cantilever beam and on a pair of linearly coupled piezoelectric equations. An important element in the modelization of such materials is the energy loss term; in this paper a viscous damping contribution is considered which allows us to extract more realistic constituent equations for the material to work as sensor and actuator. The development of this equation as an infinite linear combination of each mode allows us to extract a compact lumped equivalent electrical circuit to work at any frequency region as sensor or actuator instead of the classical reduced models. Theory is reduced to study the dynamics of a triple-layer commercial cantilever and then is compared with experimental results
本文给出了描述多层压电悬臂梁在电子和力学耦合域上行为的组成方程。该研究是基于控制欧拉-伯努利悬臂梁运动的偏微分方程和一对线性耦合压电方程的模态分析。这类材料模型化的一个重要因素是能量损失项;本文考虑了粘性阻尼的贡献,使我们能够提取更真实的成分方程,使材料作为传感器和作动器。将该方程发展为每个模态的无限线性组合,使我们能够提取一个紧凑的集总等效电路,作为传感器或执行器在任何频率区域工作,而不是经典的简化模型。将理论简化为三层商业悬臂梁的动力学研究,并与实验结果进行了比较
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引用次数: 3
Finite Element Modeling of Electrostatic MEMS Including the Impact of Fringing Field Effects on Forces 包含边缘场效应对力影响的静电MEMS有限元建模
Pub Date : 2006-04-24 DOI: 10.1109/ESIME.2006.1643959
M. Boutaayamou, K. H. Nair, R. Sabariego, P. Dular
The numerical models describing the behaviour of electrostatically actuated microsystems often disregard fringing fields. However, taking the fringing fields into account is crucial for an accurate computation of the electrostatic forces. In this work, the finite element method is applied for modeling electrostatic actuators. The electrostatic force distribution is obtained by locally applying the virtual work method. A micro-beam and a comb drive are considered as test cases. The impact of the fringing field effects on the accuracy of electrostatic forces is shown through 2D and 3D parametric studies
描述静电驱动微系统行为的数值模型经常忽略边缘场。然而,考虑边缘场是精确计算静电力的关键。本文采用有限元方法对静电致动器进行建模。局部应用虚功法得到静电力分布。以微梁和梳状传动为试验用例。通过二维和三维参数研究,揭示了边缘场效应对静电力计算精度的影响
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引用次数: 8
Virtual Design and Qualification of IC Backend Structures 集成电路后端结构的虚拟设计与鉴定
Pub Date : 2006-04-24 DOI: 10.1109/ESIME.2006.1643962
R. van Silfhout, O. van der Sluis, W. V. van Driel, J. Janssen, G.Q. Zhang
For Integrated Circuit (IC) wafer backend development, process developers have to design robust backend structures that guarantee both functionality and reliability during waferfab processes, packaging, qualification tests and lifetime. Figure 1 shows a simplified diagram for the design (and redesign) cycle forevelopment. Subsequently, package development IC development. Subsequently, package develop t . inherited runs a similar cycle. By using reliability modell relate it to the interaction of IC and package assembly, such as IC/compound delamination, we aim at integrating IC and packge prototyping in order to develop reliable IC packages faster. This paper presents parts of our research to approach thermo-mechanical IC reliability by virtually designing and quaifying IC backend structures in both IC processing, packaging and testing processes. By combining experimental and numerical results, targeted failure modes and mechanisms as well as their interactions are understood. It is found that delamination is the key trigger for passivation cracking and metal shift. Even more, the layout of interconnect metals in the backend of ICs has a major effect on under bond-pad wir delamination observed after wafer probing an wire ing. Reliable predictive modelling approaches enable IC package development towards a first-time-right practice.
对于集成电路(IC)晶圆后端开发,工艺开发人员必须设计健壮的后端结构,以保证在晶圆工艺、封装、资格测试和使用寿命期间的功能和可靠性。图1显示了开发的设计(和重新设计)周期的简化图。随后,封装开发集成电路开发。随后,包开发完成。继承也有类似的循环。通过将可靠性模型与集成电路和封装组装的相互作用联系起来,例如集成电路/化合物分层,我们旨在将集成电路和封装原型集成起来,从而更快地开发可靠的集成电路封装。本文介绍了我们通过在集成电路加工、封装和测试过程中虚拟设计和鉴定集成电路后端结构来接近热机械集成电路可靠性的部分研究。通过结合实验和数值结果,了解了目标失效模式和机制以及它们之间的相互作用。发现分层是钝化开裂和金属移位的关键触发因素。更重要的是,集成电路后端互连金属的布局对晶圆探测和布线后观察到的键合垫下导线分层有重要影响。可靠的预测建模方法使IC封装开发朝着第一次正确的方向发展。
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引用次数: 1
期刊
微纳电子与智能制造
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