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    • 81. 发明申请
    • Simulating the Transmission and Simultaneous Switching Output Noise of Signals in a Computer System
    • 模拟计算机系统中信号的传输和同时切换输出噪声
    • US20120016650A1
    • 2012-01-19
    • US12838120
    • 2010-07-16
    • Timothy M. Hollis
    • Timothy M. Hollis
    • G06F17/50
    • G06F17/5009G06F17/5036G06F2217/10G06F2217/82
    • Methods implementable in a computer system for simulating the transmission of signals across a plurality of data channels (bus) are disclosed. The disclosed techniques simulate the effects of Intersymbol Interference (ISI), cross talk, and Simultaneous Switching Output (SSO) noise by generating Probability Distribution Functions (PDFs) for each. The resulting PDFs are convolved to arrive at a total PDF indicative of the reception of data subject to each of these non-idealities. The total PDF, and its underlying terms, can be indexed to particular channels of the bus as well as to particular logic states. Use of the disclosed technique allows bit error rates and sensing margins to be determined with minimal computation and simulation.
    • 公开了在用于模拟跨多个数据信道(总线)上的信号传输的计算机系统中可实现的方法。 所公开的技术通过产生每个的概率分布函数(PDF)来模拟符号间干扰(ISI),串扰和同时切换输出(SSO)噪声的影响。 所得到的PDF被卷积以得到指示接收每个这些非理想性的数据的总的PDF。 总的PDF及其基本术语可以索引到总线的特定通道以及特定的逻辑状态。 使用所公开的技术允许通过最少的计算和模拟来确定误码率和感测裕度。
    • 85. 发明授权
    • Simultaneous optimization of analog design parameters using a cost function of responses
    • 使用响应的成本函数同时优化模拟设计参数
    • US08001515B2
    • 2011-08-16
    • US12004862
    • 2007-12-21
    • Jang Dae Kim
    • Jang Dae Kim
    • G06F17/50
    • G06F17/5009G06F2217/08G06F2217/10G06F2217/16
    • An analog system consists of a multitude of interconnected components. Design of such a system involves optimization of the component parameters to achieve a target behavior, collectively called specification. The present invention provides a generic cost function for analog design optimization. It also provides cost surface modeling to speed up the optimization. The cost function compares the behavior of a design to a quantitative specification, which can be a ‘golden’ reference behavior (specification), and measures the error cost, an index of the behavioral discrepancy. That is, the target behavior is explicitly embedded in the cost function. By using the cost function, one can readily qualify a design and thereby identify good/optimum designs. The cost surface modeling with a Latin Hypercube Sampling design-of-experiment provides a statistical mathematical approximation of the actual design's error cost surface, speeding up the optimization by replacing the costly simulation of the actual design with mere evaluation of the mathematical cost surface model expression.
    • 模拟系统由多个互连组件组成。 这种系统的设计涉及组件参数的优化以实现目标行为,统称为规范。 本发明提供了用于模拟设计优化的通用成本函数。 它还提供成本表面建模以加快优化。 成本函数将设计的行为与定量规范进行比较,这可以是“黄金”参考行为(规范),并测量错误成本,这是行为差异的指标。 也就是说,目标行为被明确地嵌入到成本函数中。 通过使用成本函数,可以很容易地对设计进行限定,从而确定良好/最佳设计。 拉丁超立方体采样设计实验的成本表面建模提供了实际设计的误差成本面的统计学数学近似,通过仅仅评估数学成本表面模型表达式代替实际设计的昂贵模拟来加快优化速度 。