Collaborative Research: Algorithms for Simulation and Design of Analog VLSI Lattices

无线通信、便携式计算和手持电子等领域的新技术增加了对高频信号处理的需求。设计能够满足这一需求的硅集成电路的部分挑战是克服现代晶体管在效率和频率带宽方面的限制。这里建议使用由电感和电容组成的二维网络来克服这些限制。这些高速、高效的网络的截止频率高于硅基晶体管。此外，这样的网络可以被整合到可以低成本制造的标准硅芯片中。这项拟议的研究有可能给高频模拟信号处理带来革命性的变化，导致芯片的运行速度比目前的芯片快1000倍。这种网络有大量可能的设计，但只有一小部分可能性已经被探索。这项拟议的研究旨在开发算法，为二维电感-电容网络的模拟和设计提供极大的帮助。模拟一个大型网络涉及到一个大型耦合方程组的求解，通过数学分析可以大大简化这一系统。有人建议利用这种简化来开发用于网络模拟的快速、可扩展的算法和代码。这将使工程师能够快速了解改变典型大规模电感-电容网络中数千个参数中的一个或多个参数的效果，并提出使用优化方法来自动设计满足指定输入输出关系的网格。优化工作将使用提出者先前的结果作为基础，例如，包括开发在模拟域中计算傅里叶变换的二维网络。这种物理激励的想法将与现代并行数值计算工具相结合，如PetSC(可移植可扩展科学计算工具包)和TAO(高级优化工具包)。这将产生快速、准确的工具，使工程师能够快速优化网格的设计，以达到所需的性能规范。在实施拟议研究中获得的专业知识将使研究人员能够培训学生和研究人员解决现代计算科学和工程中的问题。这项拟议的研究鼓励科学家、工程师、应用数学家和计算机科学家之间的多学科互动，从计算工具的开发人员到用户。

New technologies in areas such as wireless communication, portable computing, and handheld electronics have increased the demand for signal processing at high frequencies. Part of the challenge in designing silicon integrated circuits that can meet this demand is to overcome limitations in the efficiency and frequency bandwidth of modern transistors. Here it is proposed to use two-dimensional networks of inductors and capacitors to overcome these limitations. These high-speed, high-efficiency networks have a cut-off frequency that is higher than that for silicon-based transistors. Moreover, such networks can be incorporated into standard silicon chips that can be fabricated at low cost. The proposed research has the potential to revolutionize high-frequency analog signal processing, leading to chips that operate up to 1000 times faster than current ones.There are a large number of possible designs for such networks, and only a small number of these possibilities have already been explored. The proposed research seeks to develop algorithms that greatly assist in the simulation and design of two-dimensional inductor-capacitor networks. Simulating a large network involves the solution of a large, coupled system of equations that can be simplified greatly through mathematical analysis. It is proposed to use this simplification to develop fast, scalable algorithms and codes for network simulation. This would enable engineers to quickly learn the effect of changing one or more of the thousands of parameters in a typical large-scale inductor-capacitor network.It is also proposed to use optimization methods to automatically design lattices that achieve prescribed input-output relationships. The optimization work will use as a foundation the prior results of the proposers, including, for example, the development of a two-dimensional network that computes Fourier transforms in the analog domain. Such physically motivated ideas will be coupled with modern tools of parallel numerical computing such as PetSC (the Portable Extensible Toolkit for Scientific Computation) and TAO (the Toolkit for Advanced Optimization). This will result in fast, accurate tools that enable engineers to rapidly optimize the design of a lattice to achieve desired performance specifications.The expertise gained in carrying out the proposed research will enable the investigators to train students and researchers to solve problems in modern computational science and engineering. The proposed research encourages multidisciplinary interaction between scientists, engineers, applied mathematicians, and computer scientists spanning the spectrum from developers to users of computational tools.