Localized relaxation theory of circuits and its applications in electro-thermal analyses

Localized relaxation theory of circuits and its applications in electro-thermal analyses
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电路局域弛豫理论及其在电热分析中的应用

DOI:
10.1007/s11432-011-4479-1
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发表时间:
2012-01
期刊:
Science China Information Sciences
影响因子:
--
通讯作者:
Tan, Sheldon X-D
Tan, Sheldon X-D
中科院分区:
其他
文献类型:
--
作者:
Luo ZuYing;Zhao GuoXing;Gordon, Joseph A.;Tan, Sheldon X-D

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在设计复杂程度不断提高的高性能集成电路设计中,对集成电路参数进行有效的分析是一项非常重要的设计内容。因此,电热(ET)分析包括电源/地(P/G)分析和热分析是当今IC研究的热点。由于ET分析方程具有稀疏、正定和严格对角占优的系数矩阵,我们证明了ET分析具有局部性优势。基于这一优点,正式提出了局部松弛方法,它与在相同截断误差限制的约束下进行的全局松弛方法具有相同的精度。基于局部松弛理论,提出了一种高效实用的局部逐次超松弛算法(LSOR2),并将其应用于解决以下三个ET分析问题。(1)P/G网络中过IR-Drop节点的单节点统计电压分析;(2)3D热分析中热点的单节点统计温度分析;(3)P/G网络的快速单开路缺陷分析。大量的实验数据表明,与全局逐次超松弛(SOR)算法相比,LSOR2在相同精度的情况下可以提高1-2个数量级的计算速度。
In the high-performance IC design with increasing design complexity, it is a very important design content to efficiently analyze IC parameters. Thus, the electro-thermal (ET) analyses including power/ground (P/G) analysis and thermal analysis are hot topics in today’s IC research. Since ET analysis equation has a sparse, positive definite and strictly diagonally dominant coefficient-matrix, we prove that the ET analysis has the advantage of locality. Owing to this advantage, localized relaxation method is formally proposed, which has the same accuracy as the global relaxation done with the constraint of the same truncation error limitation. Based on the localized relaxation theory, an efficient and practical localized successive over-relaxation algorithm (LSOR2) is introduced and applied to solve the following three ET analysis problems. (1) Single-node statistical voltage analysis for over-IR-drop nodes in P/G networks; (2) single-node statistical temperature analysis for hot spots in 3D thermal analysis; (3) fast single open-defect analysis for P/G networks. A large amount of experimental data demonstrates that compared with the global successive over-relaxation (SOR) algorithm, LSOR2 can speed up 1–2 orders of magnitudes with the same accuracy in ET analyses.
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