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Proceedings IEEE 2000 First International Symposium on Quality Electronic Design (Cat. No. PR00525)最新文献

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Design for variability in DSM technologies [deep submicron technologies] DSM技术的可变性设计[深亚微米技术]
S. Nassif
Process-induced parameter variations cause performance fluctuations and are an important consideration in the design of high performance digital ICs. Until recently, it was sufficient to model die-to-die shifts in device (active) and wire (passive) parameters, leading to a natural worst-case design methodology. In the deep-submicron era, however, within-die variations in these same device and wire parameters become just as important. In fact, current integrated circuits are large enough that variations within the die are as large as variations from die-to-die. Furthermore, while die-to-die shifts are substantially independent of the design, within-die variations are profoundly influenced by the detailed physical implementation of the IC. This changes the fundamental view of process variability from something that is imposed on the design by the fabrication process to something that is co-generated between the design and the process. This paper starts by examining the sources and historical trends in device and wire variability, distinguishing between inter-die and intra-die variations, and proposes techniques for design for variability (DOV) in the presence of both types of variations.
工艺引起的参数变化引起性能波动,是高性能数字集成电路设计中的一个重要考虑因素。直到最近,对器件(有源)和导线(无源)参数的模到模位移进行建模就足够了,这导致了自然的最坏情况设计方法。然而,在深亚微米时代,这些相同器件和导线参数的模内变化变得同样重要。事实上,目前的集成电路已经足够大,以致于芯片内部的变化与芯片之间的变化一样大。此外,虽然模具到模具的变化基本上独立于设计,但模具内部的变化却受到IC详细物理实现的深刻影响。这将工艺可变性的基本观点从制造过程强加给设计的东西转变为设计和工艺之间共同产生的东西。本文首先检查了器件和线材可变性的来源和历史趋势,区分了模具间和模具内的变化,并提出了在存在两种类型变化的情况下设计可变性(DOV)的技术。
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引用次数: 46
Transistor modeling for the VDSM era VDSM时代的晶体管建模
M. Shur, T. Fjeldly, T. Ytterdal
We review field effect transistor modeling with emphasis on device parameter extraction for testing. We consider the physics-based universal charge control model, which allows us to describe the subthreshold, the weak inversion, and the strong inversion regimes in MOSFETs using a relatively small set of parameters, most of which are related to the device structure or fabrication process. This small parameter set makes the task of parameter extraction easier. The model accounts for velocity saturation, finite output conductance in saturation, drain induced barrier lowering, kink effect, floating body effect, and subthreshold leakage. The model has been applied to MOSFETs, SOI transistors, GaAs MESFETs, GaAs based HEMTs, amorphous, polysilicon and organic TFTs, AlGaN/GaN HEMTs, and to new emerging heterodimensional transistors. For compound semiconductor devices, additional effects, such as frequency dispersion and temperature dependence of model parameters, and gate leakage current, including hot-carrier leakage, have been accounted for.
我们回顾了场效应晶体管的建模,重点是用于测试的器件参数提取。我们考虑了基于物理的通用电荷控制模型,该模型允许我们使用相对较小的参数集来描述mosfet中的亚阈值,弱反转和强反转机制,其中大部分参数与器件结构或制造工艺有关。这个小的参数集使得参数提取的任务更加容易。该模型考虑了速度饱和、饱和时有限输出电导、漏阻降低、扭结效应、浮体效应和阈下泄漏。该模型已应用于mosfet, SOI晶体管,GaAs mesfet, GaAs基hemt,非晶,多晶硅和有机tft, AlGaN/GaN hemt以及新兴的异质尺寸晶体管。对于化合物半导体器件,额外的影响,如模型参数的频率色散和温度依赖性,以及栅极泄漏电流,包括热载流子泄漏,已经被考虑在内。
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引用次数: 6
An analytical model for delay and crosstalk estimation with application to decoupling 延迟和串扰估计的解析模型及其解耦应用
M. Becer, I. Hajj
The impact of interconnect coupling, in the form of delay and crosstalk, in deep submicron integrated circuit design is increasing. In many cases, especially in routing, the coupling capacitance, C/sub c/, between adjacent lines is decoupled and replaced by 2C/sub c/ connected to ground for fast worst-case delay estimation. This is based on the assumption that worst-case delay occurs when two adjacent lines switch simultaneously in opposite directions so that the voltage change across the coupling capacitance is twice that when only one line is switching. Similarly, when two adjacent lines switch simultaneously in the same direction, the coupling capacitance is put to zero based on the fact that the voltage difference across it is zero. However, we show that by replacing the coupling capacitance C/sub c/ with a grounded capacitance of 2C/sub c/ (or by zero) when signals switch simultaneously in opposite (or same) directions may overestimate or even underestimate the actual delay. The variable strengths of the drivers driving the coupled lines bring in an additional level of complexity to the delay estimation when coupling exists. In this paper, we derive a simple analytical model that takes the effect of different driver strengths into account, to accurately estimate the delay and crosstalk of two coupled interconnect lines switching simultaneously. This approach also gives the exact values of the multiplicants that C/sub c/ should be multiplied with, if the lines are to be decoupled, for both worst-case and best-case delay computation; that is when the signals switch in opposite direction and when they switch in the same direction.
在深亚微米集成电路设计中,互连耦合以延迟和串扰的形式产生的影响越来越大。在许多情况下,特别是在布线中,相邻线路之间的耦合电容C/sub C/被解耦并由连接到地的2C/sub C/取代,以便快速估计最坏情况下的延迟。这是基于这样的假设:当两条相邻的线路同时在相反的方向上切换时,最坏情况下的延迟会发生,从而使耦合电容上的电压变化是只有一条线路切换时的两倍。类似地,当两条相邻的线在同一方向上同时切换时,基于其上的电压差为零,耦合电容为零。然而,我们表明,当信号同时在相反(或相同)方向切换时,通过将耦合电容C/sub C/替换为2C/sub C/接地电容(或零),可能会高估甚至低估实际延迟。当存在耦合时,驱动耦合线的驱动器的可变强度给延迟估计带来了额外的复杂性。在本文中,我们推导了一个简单的分析模型,考虑了不同驱动强度的影响,以准确估计两个耦合互连线同时切换时的延迟和串扰。这种方法还给出了C/sub C/应该乘以的乘法的确切值,如果要解耦,对于最坏情况和最佳情况的延迟计算;这是指信号在相反方向和相同方向上的转换。
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引用次数: 31
Three dimensional analysis of thermal degradation effects in FDSOI MOSFETs FDSOI mosfet热降解效应的三维分析
Kwan-Do Kim, Young-Kwan Park, Jun-Ha Lee, J. Kong, Hee-Sung Kang, Young-Wug Kim, Seok-Jin Kim
Fully Depleted Silicon-on-Insulator (SOI) devices have led to better electrical characteristics (e.g., reduced junction depth, increased channel mobility, suppressed short channel effect, excellent latchup immunity, and improved subthreshold characteristics) than bulk CMOS devices. However, the presence of a thin top silicon layer and a buried SiO/sub 2/ layer causes self-heating due to the low thermal conductivity of the buried oxide. The electrical characteristics of FDSOI devices strongly depend on the path of heat dissipation. In this paper, we present a new three dimensional (3D) analysis technique for the self-heating effect of the finger-type and bar-type transistors. The 3D analysis results show that the drain current of the finger-type transistor is 14.7% smaller than that of the bar-type transistor due to the 3D self-heating effect. We have learned that the rate of current degradation increases significantly when the width of a transistor is smaller than a critical value in a finger-type layout. The current degradation for the 3D structures of the finger-type and bar-type transistors is investigated and the design issues are also discussed.
完全耗尽绝缘体上硅(SOI)器件比体CMOS器件具有更好的电特性(例如,减少结深度,增加通道迁移率,抑制短通道效应,出色的闭锁抗扰度和改进的亚阈值特性)。然而,由于埋置氧化物的低导热性,薄的顶部硅层和埋置SiO/ sub2 /层的存在导致自热。FDSOI器件的电特性很大程度上取决于散热路径。本文提出了一种新的手指型和条形晶体管自热效应的三维分析方法。三维分析结果表明,由于三维自热效应,指型晶体管的漏极电流比棒型晶体管的漏极电流小14.7%。我们已经了解到,当晶体管的宽度小于指型布局中的临界值时,电流退化的速度会显著增加。研究了指形和条形晶体管三维结构的退化问题,并对其设计问题进行了讨论。
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引用次数: 1
Correct-by-design CAD enhancement for EMI and signal integrity 设计正确的CAD增强EMI和信号完整性
E. McShane, K. Shenai
The monolithic integration of mixed-signal and RF microelectronics is straining the capabilities of present CAD roots for predictive analysis. In particular, the effects of di/dt, crosstalk, high-frequency impedance matching, and substrate noise pose challenges to reliable circuit operation. This is especially true as supply rail voltages continue to shrink below 2.5 V. Although PCB CAD tools have successfully addressed these issues, similar. tools have yet to penetrate the VLSIC/RFIC market due to the even greater signal frequencies and far greater network density. We describe an ongoing research effort to introduce models of these effects into a commercial CAD tool. The goal is to develop a correct-by-design CAD system in which constraints on signal crosstalk and EMI are considered along with signal delay and power restrictions in performing automated floor-planning and routing. To permit top-down synthesis of reliable systems, we are also expanding the HDL coding of digital systems to include two additional parameters: EMI victim status and EMl point-source contributions.
混合信号和射频微电子的单片集成使当前CAD根的预测分析能力变得紧张。特别是,di/dt、串扰、高频阻抗匹配和衬底噪声的影响对可靠的电路工作提出了挑战。当供电轨电压继续缩小到2.5 V以下时尤其如此。虽然PCB CAD工具已经成功地解决了这些问题,但类似的。由于更高的信号频率和更大的网络密度,工具尚未渗透到VLSIC/RFIC市场。我们描述了一项正在进行的研究工作,将这些影响的模型引入商业CAD工具。目标是开发一种设计正确的CAD系统,该系统在执行自动地板规划和布线时考虑了信号串扰和EMI的限制以及信号延迟和功率限制。为了允许自上而下的可靠系统合成,我们还扩展了数字系统的HDL编码,以包括两个额外的参数:电磁干扰受害者状态和电磁干扰点源贡献。
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引用次数: 0
On testability of multiple precharged domino logic 多预付费多米诺逻辑的可测试性
T. Haniotakis, Y. Tsiatouhas, D. Nikolos, C. Efstathiou
Domino circuits are increasingly popular because they offer a significant performance boost over static ones. An inherent problem with domino CMOS gates is that under specific input conditions the charge redistribution between parasitic capacitances at internal nodes of the circuit can destroy the noise margin and cause glitches at the output of a domino gate. Among the dominant solutions proposed, in the open literature, to overcome this problem is the technique of internal nodes multiple precharging. However the added precharge transistors are not testable for stuck-open and stuck-on faults. Undetectable stuck-open faults on these transistors cause reduction of the noise margins of the gate. Then the operation of the circuit in the field is sensitive to environmental factors, such as noise. In this paper we propose a new internal nodes multiple precharging scheme that leads to testable designs for stuck-open and stuck-on faults.
Domino电路越来越受欢迎,因为它们比静态电路提供了显著的性能提升。多米诺骨牌CMOS门的一个固有问题是,在特定的输入条件下,电路内部节点的寄生电容之间的电荷再分配会破坏噪声裕度并导致多米诺骨牌门输出的小故障。在公开文献中提出的主要解决方案中,克服这一问题的是内部节点多次预充技术。然而,所增加的预充晶体管不能对卡开和卡上故障进行测试。这些晶体管上无法检测到的卡开故障导致栅极的噪声边界降低。那么电路在现场的运行对环境因素很敏感,比如噪声。本文提出了一种新的内部节点多重预充方案,从而实现了卡开和卡上故障的可测试设计。
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引用次数: 1
Tool interoperability is key to improved design quality 工具互操作性是提高设计质量的关键
R. Goldman, K. Bartleson
Deep submicron processes are driving silicon complexity, time-to-market windows continue to shrink and experienced design engineers are at a premium. The system-on-a-chip era is approaching and pushing technology at every turn. As a result, companies are looking for ways to get the most out of their design resources. High quality design systems, developed from powerful EDA tools and interface software, ensure more efficient use of resources and ultimately, high quality designs. Unfortunately, many engineers are spending time wrestling new tools into their design systems instead of designing or verifying their designs. The need for EDA tool interoperability has never been greater. Fortunately, some progressive EDA companies are spearheading efforts to improve tool interoperability. This paper will explore the benefits of tool interoperability and define several ways that it can be achieved.
深亚微米工艺正在推动硅的复杂性,上市时间窗口继续缩小,经验丰富的设计工程师非常宝贵。片上系统时代正在来临,并不断推动着技术的发展。因此,公司正在寻找从设计资源中获得最大收益的方法。高质量的设计系统,由强大的EDA工具和接口软件开发,确保更有效地利用资源,最终,高质量的设计。不幸的是,许多工程师花时间将新工具引入他们的设计系统,而不是设计或验证他们的设计。对EDA工具互操作性的需求从未如此强烈。幸运的是,一些进步的EDA公司正在努力改进工具的互操作性。本文将探讨工具互操作性的好处,并定义实现它的几种方法。
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引用次数: 2
Quality of EDA CAD tools: definitions, metrics and directions EDA CAD工具的质量:定义、度量和方向
A. Farrahi, D. J. Hathaway, Maogang Wang, M. Sarrafzadeh
In this paper we survey major problems faced by EDA tools in tackling deep submicron (DSM) design challenges like: crosstalk, reliability, power and interconnect dominated delay. We discuss the need for rethinking quality models used in EDA tools to allow early and reliable planning, estimation, analysis, and optimization. Key design quality metrics from a CAD tool perspective are surveyed, and methodologies and directions are proposed for the next generation design automation tools, intended to meet the challenges ahead. Ideas such as forward synthesis, incremental synthesis, system-level interconnect prediction and planning, and their implications on design quality design tool architecture, and design methodology are explored.
在本文中,我们调查了EDA工具在解决深亚微米(DSM)设计挑战时面临的主要问题,如串扰、可靠性、功率和互连主导延迟。我们讨论了重新考虑EDA工具中使用的质量模型的必要性,以允许早期和可靠的计划、评估、分析和优化。从CAD工具的角度调查了关键的设计质量指标,并为下一代设计自动化工具提出了方法和方向,旨在迎接未来的挑战。探讨了前向综合、增量综合、系统级互连预测和规划等思想,以及它们对设计质量、设计工具架构和设计方法的影响。
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引用次数: 16
A layout approach for electrical and physical design integration of high-performance analog circuits 一种高性能模拟电路的电气和物理设计集成的布局方法
M. Dessouky, M. Louërat
This paper presents a layout generation tool that aims to reduce the gap between electrical sizing and physical realization of high performance analog circuits. The procedural layout approach is shown to be best suited for this kind of methodology. Once captured, the procedural description can be used several times to calculate both rapidly and accurately all parasitics that appear during physical realizations without layout generation. Efficient algorithms are developed to take into account analog layout constraints such as matching, parasitic control, shape and reliability considerations. This allows one to account for these effects early in the design which guarantees the fulfilment of the required performance specifications, permits one to optimize various design aspects in the presence of parasitics and shortens the overall design time by avoiding laborious sizing-layout iterations. An example of a high performance OTA is presented at the end to illustrate the effectiveness of the approach.
本文提出了一种版图生成工具,旨在减少高性能模拟电路的电气尺寸与物理实现之间的差距。程序布局方法被证明是最适合这种方法的。一旦捕获,程序描述可以多次用于快速准确地计算物理实现过程中出现的所有寄生,而无需生成布局。有效的算法开发考虑模拟布局约束,如匹配,寄生控制,形状和可靠性的考虑。这允许人们在设计的早期考虑这些影响,保证满足所需的性能规范,允许人们在存在寄生的情况下优化各个设计方面,并通过避免费力的尺寸布局迭代缩短总体设计时间。最后给出了一个高性能OTA的例子来说明该方法的有效性。
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引用次数: 29
Low power testing of VLSI circuits: problems and solutions VLSI电路的低功耗测试:问题与解决方案
P. Girard
Power and energy consumption of digital systems may increase significantly during testing. This extra power consumption due to test application may give rise to severe hazards to the circuit reliability. Moreover, it may be responsible for cost, performance verification as well as technology related problems and can dramatically shorten the battery life when on-line testing is considered. In this paper, we present a survey of the low power testing techniques that can be used to test VLSI systems. In the first part, the paper explains the problems induced by the increased power consumed during functional testing of a circuit, in either external testing or built-in self-test (BIST). Next, we survey state-of-the-art techniques that exist to reduce this power/energy consumption during test mode and allow non-destructive testing of the device under test.
在测试过程中,数字系统的功耗和能耗可能会显著增加。由于测试应用而产生的额外功耗可能会对电路的可靠性造成严重危害。此外,它可能会造成成本,性能验证以及技术相关问题,并且在考虑在线测试时可能会大大缩短电池寿命。在本文中,我们提出了低功耗测试技术,可用于测试超大规模集成电路系统的调查。在第一部分中,本文解释了在电路的功能测试中,无论是外部测试还是内置自检(BIST),由于功耗增加而引起的问题。接下来,我们调查了现有的最先进的技术,以减少测试模式期间的功率/能量消耗,并允许对被测设备进行无损检测。
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引用次数: 92
期刊
Proceedings IEEE 2000 First International Symposium on Quality Electronic Design (Cat. No. PR00525)
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