加速SPICE进行三维电磁分析

互连结构的电磁分析越来越受到人们的重视.针对三维互连,A.E.Ruehli提出了部分元等效电路法.但该法生成的等效电路具有紧耦合性,用SPICE进行分析时稀疏矩阵技术已失去原先的优越性.本文采用广义残量法作为大型紧耦合线性方程组的求解工具以取代SPICE中的LU分解法,并辅以初值预估.实际计算表明,本文的方法提高了运算速度.广义残量法也可用于矩量法的方程求解中.     

Device-physics-based analytical model for SET pulse in sub-100 nm bulk CMOS Process

Through revising the process of charge collection for reversed drain-bulk junction,a bias-dependent SPICE model is proposed which includes the bipolar amplification effect that cannot be ignored in PMOS.The model can capture the plateau effect,and produce current and voltage pulse shapes and widths that are consistent with TCAD simulation.Considering the case of connecting load,it is still valid.For combination and sequential logic circuits,the SET pulsewidths and LET upset threshold from SPICE model are consistent with TCAD simulations.     

Research on technology of desktop virtualization based on SPICE protocol and its improvement solutions

Increasingly mature cloud computing technology promotes virtual desktop technology, which can solve many problems existing in traditional computing models. However, virtual desktop solutions introduce the thorny problem of how to deliver a real desktop experience to users, as if they are using it locally, especially when playing video. The SPICE （simple protocol for independent computing environments） virtual desktop solution provides several image compression algorithms to address this problem with the purpose of making virtual desktops as real as possible. Although different compression algorithms can contribute their own abilities to different images to a large extent, switching between them is a big problem that consumes a large amount of resources to detect the different type of image and also causes jitter of the virtual desktop. This paper proposes a new solution, called SPICEx, using the JPEG2000 compression algorithm with dynamic compression ratios to solve the problem and finally validates that the performance is better than that of SPICE. With better quality of user experience and also reducing bandwidth consumption, SPICEx solution is meaningful in virtual desktop fields and can be widely used.     

布尔过程论的实验研究

布尔过程论是1994年提出的一种高速电路设计与测试分析理论,是布尔代数在时域中的扩充,适用于IC定时研究与分析。但布尔过程论的实践可行性受到一些国际同行的质疑,该文的工作旨在解释布尔过程论的物理意义以及构成布尔过程论的实际基础。文中采用SPICE软件模拟电路中的电压波形,对一些电路例子进行模拟,发现模拟结果与用布尔过程得出的结果是一致的,这就以实验验证了布尔过程论。同时,又通过实验得到了布尔过程论中提出的一些参数的数值。     

一种快速三角形电源地平面谐振腔模型

针对等腰直角三角形平面模型效率低和精度差的问题,在双频点近似算法的基础上,提出了一种快速的Spice兼容等腰直角三角形平面谐振腔模型.与电感近似的等腰直角三角形平面模型相比,提出的模型使用最少的谐振腔基本模式与单节的高阶修正电路,不仅提高了等腰直角三角形电源地平面的仿真效率,而且改善了模型精度.仿真结果表明,电感近似模型在分类关键因子为2时,最大误差约为10%;提出的模型在分类关键因子为1.3时,最大误差约为1%,其仿真时间仅为电感近似模型的26%,验证了该模型在提高等腰直角三角形电源地平面的仿真效率和改善模型精度上的有效性.     

如何实现MATLAB与SPICE仿真分析之间的转换

结合SPICE与MATLAB仿真软件各自的特点,对它们之间的转换进行研究。通过采用接口软件进行动态连接或嵌入,实现了SPICE与MATLAB之间的转换。较好地解决了在复杂系统仿真分析中,发挥这两种仿真软件的各自优点的问题,从而使系统仿真更具有实用性。     

用于CMOS设计的一种专用基准电压电路

提出一种用于CMOS设计的专用基准电压电路，通过SPICE模拟、电路分析和应用，证明电路设计正确、可行。最后，给出了应用实例。     

Performance analysis of a k‐nearest neighbor searching technique

Abstract

A transfer admittance is treated as a two‐terminal network driven by cascaded dependent sources. By complex‐curve fitting, each of the four admittances of a conventional two‐port model can be approximated over a wideband with a rational function of frequency. A SPICE2‐acceptable R‐L‐C two‐port model can then be derived by applying continued fractions to the rational functions. Examples are included to demonstrate the applications of this method.     

1.25 G光纤收发器SFP设计与仿真

对千兆SFP光纤收发器中控制电路参数设计及利用Cadence软件进行仿真展开了一定的探讨,提出千兆SFP光纤收发器中控制电路设计方案,分析了光发射模块和接收模块的性能,主要研究了在Cadence互连设计软件平台中,利用高速电路设计和信号完整性的理论,采用仿真分析的方法,对千兆SFP光收发模块进行板级分析设计,并对接收部分MAX3748芯片的SPICE模型的I/O口、MAX3744与MAX3748接口、SFP光收发模块布线进行了仿真分析,从而使电路性能达到最优化.     

基于三层模型的多量子阱激光器调制特性的SPICE模拟

从三层速率方程推导出多量子阱激光器的等效电路模型 ,并用数量而不是密度来描述载流子及光子行为 ,避开了传统方法中处处都要涉及到的体积参量 ,解释了传统的二层模型所不能解释的多量子阱 (MQW )激光器中多量子阱内载流子不均匀分布问题 ,用SPICE进行了调制特性的模拟及讨论。激光器件的模拟以层次性的方式实现 ,对使用EDA工具进行集成光学器件和系统仿真进行了探索。