標題: Reliability-Driven Power/Ground Routing for Analog ICs
作者: Lin, Jing-Wei
Ho, Tsung-Yi
Jiang, Iris Hui-Ru
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: Algorithms;Design;Performance;Analog;electromigration;IR-drop;power/ground network;routing;Steiner tree
公開日期: 1-一月-2012
摘要: Electromigration and voltage drop (IR-drop) are two major reliability issues in modern IC design. Electromigration gradually creates permanently open or short circuits due to excessive current densities; IR-drop causes insufficient power supply, thus degrading performance or even inducing functional errors because of nonzero wire resistance. Both types of failure can be triggered by insufficient wire widths. Although expanding the wire width alleviates electromigration and IR-drop, unlimited expansion not only increases the routing cost, but may also be infeasible due to the limited routing resource. In addition, electromigration and IR-drop manifest mainly in the power/ground (P/G) network. Therefore, taking wire widths into consideration is desirable to prevent electromigration and IR-drop at P/G routing. Unlike mature digital IC designs, P/G routing in analog ICs has not yet been well studied. In a conventional design, analog designers manually route P/G networks by implementing greedy strategies. However, the growing scale of analog ICs renders manual routing inefficient, and the greedy strategies may be ineffective when electromigration and IR-drop are considered. This study distances itself from conventional manual design and proposes an automatic analog P/G router that considers electromigration and IR-drops. First, employing transportation formulation, this article constructs an electromigration-aware rectilinear Steiner tree with the minimum routing cost. Second, without changing the solution quality, wires are bundled to release routing space for enhancing routability and relaxing congestion. A wire width extension method is subsequently adopted to reduce wire resistance for IR-drop safety. Compared with high-tech designs, the proposed approach achieves equally optimal solutions for electromigration avoidance, with superior efficiencies. Furthermore, via industrial design, experimental results also show the effectiveness and efficiency of the proposed algorithm for electromigration prevention and IR-drop reduction.
URI: http://dx.doi.org/10.1145/2071356.2071362
http://hdl.handle.net/11536/15692
ISSN: 1084-4309
DOI: 10.1145/2071356.2071362
期刊: ACM TRANSACTIONS ON DESIGN AUTOMATION OF ELECTRONIC SYSTEMS
Volume: 17
Issue: 1
結束頁: 
顯示於類別:期刊論文


文件中的檔案:

  1. 000300301800006.pdf