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2018 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD)最新文献

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Compact Modelling of Single Event Transient in Bulk MOSFET for SPICE: Application to Elementary Circuit 用于SPICE的块体MOSFET单事件瞬态的紧凑建模:在初级电路中的应用
N. Rostand, S. Martinie, J. Lacord, O. Rozeau, O. Billoint, J. Barbe, T. Poiroux, G. Hubert
Single Event Transients (SET) are important issues concerning reliability of CMOS circuits. They lead to occurrence of soft errors in integrated circuits, such as Single Event Upset (SEU) which consists in unexpected bit state switch in SRAM cells [1], [2]. We can find models which describe SET in literature [1], [5] but they are not compact (i e. physical model implemented in Verilog-A). In previous work [6], we proposed a theoretical SET model but the implementation in Verilog-A was still challenging. Here, we describe the implementation in Verilog-A of this model and use it through standard SPICE simulations to study the effect of SET on SRAM cell and shift register.
单事件瞬变(SET)是影响CMOS电路可靠性的重要问题。它们会导致集成电路中出现软错误,例如SRAM单元中意外的位状态切换(Single Event Upset, SEU)[1],[2]。我们可以在文献[1],[5]中找到描述SET的模型,但它们并不紧凑(即在Verilog-A中实现的物理模型)。在之前的工作[6]中,我们提出了一个理论SET模型,但在Verilog-A中实现仍然具有挑战性。在这里,我们描述了该模型在Verilog-A中的实现,并通过标准SPICE模拟来研究SET对SRAM单元和移位寄存器的影响。
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引用次数: 4
Methodology to Generate Approximate Circuits to Reduce Process Induced Degradation in CNFET Based Circuits 在CNFET电路中产生近似电路以减少过程诱导退化的方法
K. Sheikh, Lan Wei
A systematic methodology is presented to generate approximate circuits with fewer nodes and shorter paths to reduce process induced degradation due to imperfect process in emerging technologies such as CNFET. In a 16-bit CNFET adder example, at PCNTopen =5%, two resulted approximate adders achieve 80.5% and 90.2% circuit-level pass rate with a penalty of 3.3% and 24.0% in relative logic error, respectively, in comparison with 12.5% pass rate for the precision counterpart. The study paves the path to practically utilize such technology for error-resilient applications.
在CNFET等新兴技术中,提出了一种系统的方法来生成具有较少节点和较短路径的近似电路,以减少由于过程不完善而引起的过程退化。在一个16位CNFET加法器的例子中,当PCNTopen =5%时,两个近似加法器分别达到80.5%和90.2%的电路级通过率,相对逻辑误差分别为3.3%和24.0%,而精密加法器的通过率为12.5%。该研究为实际利用这种技术进行容错应用铺平了道路。
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引用次数: 0
Negative-Capacitance FinFETs: Numerical Simulation, Compact Modeling and Circuit Evaluation 负电容finfet:数值模拟,紧凑建模和电路评估
J. Duarte, Y.-K. Lin, Y. Liao, A. Sachid, M. Kao, H. Agarwal, P. Kushwaha, K. Chatterjee, D. Kwon, H.-L. Chang, S. Salahuddin, C. Hu
A complete simulation framework is presented for Negative Capacitance FinFETs including Numerical Simulation, Compact Modeling, and Circuit Evaluation. A 2D Numerical Simulation for FinFETs coupled with the Landau’s Ferroelectric Model captures device characteristics. A new version of the distributed Negative-Capacitance FinFET Compact Model is also presented in this work, where influence of short-channel effects in Ferroelectric voltage amplification are newly incorporated. Finally, a detailed analysis, from an energy perspective, is presented for the gate voltage amplification of Negative Capacitance FinFETs in ring-oscillator circuits.
提出了一个完整的负电容finfet仿真框架,包括数值仿真、紧凑建模和电路评估。结合朗道铁电模型的finfet二维数值模拟捕获了器件特性。本文还提出了一个新版本的分布式负电容FinFET紧凑模型,其中新纳入了铁电电压放大中的短通道效应的影响。最后,从能量的角度详细分析了环振电路中负电容finfet的栅极电压放大。
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引用次数: 9
Investigation of adsorbed small-molecule on boron nitride nanotube (BNNT) based on first-principles calculations 基于第一性原理计算的氮化硼纳米管吸附小分子研究
Nianduan Lu, Wei Wei, X. Chuai, Yuhan Mei, Ling Li, Ming Liu
Based on the first-principles calculations, we have investigated the structure and electronic property of adsorbed small-molecules on boron nitride nanotubes (BNNTs). It is found thatthe sites of LUMO and HOMO would be changed after BNNTs absorbed the different small moleculesThe energy gap of BNNTs decreases with increasing the distance between small molecule and BNNTThe adsorption effect of BNNT will be optimal as the distance between the small molecule and BNNT is from 1 to 1.5 Å. The potential application of BNNT as highly sensitive gas sensor for N-based small molecules has also been discussed.
基于第一性原理计算,我们研究了氮化硼纳米管(BNNTs)上吸附小分子的结构和电子性质。研究发现,BNNT吸附不同小分子后,LUMO和HOMO的位置会发生变化,BNNT的能隙随着小分子与BNNT之间距离的增加而减小,当BNNT与小分子之间距离为1 ~ 1.5 Å时,BNNT的吸附效果最佳。本文还讨论了BNNT作为n基小分子高灵敏度气体传感器的潜在应用。
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引用次数: 3
Multiscale Modeling of Ferroelectric Memories: Insights into Performances and Reliability 铁电存储器的多尺度建模:对性能和可靠性的见解
Milan Pešiü, V. D. Lecce, D. Pramanik, L. Larcher
Despite large efforts in research of HfO2-based ferroelectric (FE) random access memories (FRAM), mechanisms underlying the device behavior of and its reliability (premature degradation) are poorly understood. To tackle this issue, we used a multiscale modeling framework that allows investigating the interplay between the FE switching, defects and polycrystalline nature of the HfO2 material. This multiscale model allows connecting the electrical performances of FE devices (e.g. switching) to the atomic material properties, including defects and morphology (e.g. material phase). We used this simulation platform to both study wake-up process and the device-to-device variability in different memory architectures, i.e. capacitor-based FRAM and ferroelectric tunnel junction (FTJ) and the ferroelectric FET (FeFET) subjected to high field program/erase stress.
尽管人们对基于hfo2的铁电随机存取存储器(FRAM)进行了大量的研究,但人们对其器件行为及其可靠性(过早退化)的机制知之甚少。为了解决这个问题,我们使用了一个多尺度建模框架,该框架允许研究FE开关,缺陷和HfO2材料的多晶性质之间的相互作用。这种多尺度模型允许将FE器件的电气性能(例如开关)连接到原子材料特性,包括缺陷和形态(例如材料相)。我们利用该仿真平台研究了不同存储器结构(即基于电容的FRAM和铁电隧道结(FTJ)以及高场编程/擦除应力下的铁电场效应晶体管(FeFET))的唤醒过程和器件间的可变性。
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引用次数: 4
New physical insight for analog application in PSP bulk compact model 新的物理见解模拟应用在PSP散装紧凑模型
S. Martinie, O. Rozeau, T. Poiroux, J. Barbe, F. Gilibert, X. Montagner, Salim El Ghouli, A. Juge, D. J. Geert Smit, A. Scholten
With the maturity of CMOS technologies and their use for low voltage analog applications, some additional parasitic effects must be modeled to improve again the accuracy of SPICE models. Indeed, with the decrease of supply voltage, devices operate close to the weak inversion, where some effects such as parasitic sidewall transistor, also called hump effect [1], and the interface states effect [2], can have a significant impact on the model accuracy. This paper describes the latest significant improvements of PSP model related to version 103.6 including new compact models of parasitic MOSFET and interface states. The major challenge is to provide accurate solutions with a low impact on CPU times for large analog circuit designs. The model extensions are validated against Silicon experiments from devices with channel length down to 40nm, and including low voltage and body bias operation.
随着CMOS技术的成熟及其在低压模拟应用中的应用,必须对一些额外的寄生效应进行建模,以再次提高SPICE模型的准确性。事实上,随着电源电压的降低,器件工作在弱反转附近,其中一些效应,如寄生侧壁晶体管,也称为驼峰效应[1],以及界面状态效应[2],会对模型精度产生重大影响。本文描述了与103.6版本相关的PSP模型的最新重大改进,包括寄生MOSFET和界面状态的新紧凑模型。主要的挑战是为大型模拟电路设计提供精确的解决方案,同时降低对CPU时间的影响。模型扩展在硅实验中得到验证,硅实验的通道长度低至40nm,包括低电压和体偏置操作。
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引用次数: 2
Impact of Strain on S/D tunneling in FinFETs: a MS-EMC study 应变对FinFETs /D隧穿的影响:MS-EMC研究
C. Medina-Bailón, C. Sampedro, J. Padilla, A. Godoy, L. Donetti, V. Georgiev, F. Gámiz, A. Asenov
As device dimensions are scaled down, the use of strained channels as performance booster becomes of special relevance. Moreover, the inclusion of quantum effects in the transport direction is imperative to predict the performance of future transistors. In particular, Source-to-Drain tunneling (S/D tunneling) is presented as a scaling limit in sub-10nm nodes. In this work, a Multi-Subband Ensemble Monte Carlo (MS-EMC) study of the impact of S/D tunneling in relaxed and biaxially strained channel FinFETs is presented.
随着设备尺寸的缩小,使用应变通道作为性能增强器变得特别重要。此外,在输运方向上包含量子效应对于预测未来晶体管的性能是必要的。特别地,源-漏隧道(S/D隧道)在10nm以下的节点中作为缩放限制被提出。在这项工作中,多子带集成蒙特卡罗(MS-EMC)研究了松弛和双轴应变通道finfet中S/D隧穿的影响。
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引用次数: 1
Evidence of fast and low-voltage A2RAM ‘1’ state programming 快速和低电压A2RAM ' 1 '状态编程的证据
F. T. Wakam, J. Lacord, M. Bawedin, S. Martinie, S. Cristoloveanu, J. Barbe
For the first time, we demonstrate a new concept for programming the ‘1’ state in A2RAM based on the impact ionization in the bridge, which can be assisted by the band-to-band tunneling effect in the top part of the silicon film. This new programming method reduces the programming voltage and writing time, making the A2RAM suitable as 1T-DRAM. Evidenced through TCAD simulation, the feasibility in matrix environment is also demonstrated.
我们首次展示了一种基于电桥中的冲击电离在A2RAM中编程“1”态的新概念,这可以通过硅膜顶部的带对带隧道效应来辅助。这种新的编程方法降低了编程电压和写入时间,使A2RAM适用于1T-DRAM。通过TCAD仿真验证了该方法在矩阵环境下的可行性。
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引用次数: 2
Intelligent DTCO (iDTCO) for next generation logic path-finding 下一代逻辑寻径的智能DTCO (iDTCO)
U. Kwon, T. Okagaki, Young-seok Song, Sungyeol Kim, Yohan Kim, Minkyoung Kim, A. Kim, Saetbyeol Ahn, Jihye Shin, Yonghee Park, Jongchol Kim, D. Kim, Weiyi Qi, Yang Lu, Nuo Xu, Hong-hyun Park, J. Wang, W. Choi
Intelligent design technology co-optimization (iDTCO) methodology for next generation logic architecture pathfinding and its application results are presented in this paper. There are 2 major steps in our iDTCO framework; standard cell (STC)-level iDTCO and block-level iDTCO. STC-level iDTCO, the main focus of this paper, consists of 4 major components; (1) full 3D process emulation with litho contour of standard cell (STC) layout, (2) auto-extraction of transistor compact model & parasitic RC extraction (PEX) in 3D, (3) performance-power-yield (PPY) analyzer, (4) multi-objective optimization of layout & process assumption (PA) to get best PPY. Applying our STC-level iDTCO flow to logic arch pathfinding, we could speed up our PPY analysis TAT by 5$sim$10 times with good accuracy of >95%.
介绍了下一代逻辑体系结构寻路的智能设计技术协同优化方法及其应用效果。我们的iDTCO框架有两个主要步骤;标准单元(STC)级iDTCO和块级iDTCO。本文主要研究的stc级iDTCO由4个主要组成部分组成;(1)采用标准电池(STC)布局的光刻轮廓进行全三维工艺仿真;(2)晶体管紧凑模型的自动提取与三维寄生RC提取(PEX);(3)性能功率产率(PPY)分析仪;(4)布局与工艺假设(PA)的多目标优化以获得最佳PPY。将我们的stc级iDTCO流应用于逻辑arch寻径,我们可以将我们的PPY分析TAT速度提高5$sim$10倍,准确率>95%。
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引用次数: 0
DTCO and TCAD for a 12 Layer-EUV Ultra-Scaled Surrounding Gate Transistor 6T-SRAM 12层euv超尺度环绕栅晶体管6T-SRAM的DTCO和TCAD
P. Matagne, H. Nakamura, M. Kim, Y. Kikuchi, T. Huynh-Bao, Z. Tao, W. Li, K. Devriendt, L. Ragnarsson, J. Boemmels, A. Mallik, E. Altamirano-Sachez, F. Sebaai, C. Lorant, N. Jourdan, C. Porret, D. Mocuta, N. Harada, F. Masuoka
A flow, module steps and key structural elements enabling a surrounding gate transistor (SGT) based 6T-SRAM with 50nm pillar pitch and 0.0205 um2 are presented, with emphasis on process challenges and innovations. A new DTCO/TCAD methodology is used to explore the design space, demonstrate the bit cell functionality and optimize the process. In particular, it is shown that vertical SGT are extremely sensitive to gate misalignment and that buried bottom contact makes the process immune to doping variations and misalignments.
介绍了基于50nm柱距和0.0205 um2的6T-SRAM的流程,模块步骤和关键结构元件,重点介绍了工艺挑战和创新。一种新的DTCO/TCAD方法用于探索设计空间,展示位元功能并优化工艺。特别是,垂直SGT对栅极错位非常敏感,而埋在底部的接触使得该过程不受掺杂变化和错位的影响。
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引用次数: 1
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2018 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD)
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