Performance-driven Routing Methodology with Incremental Placement Refinement for Analog Layout Design

Hao Yu Chi, Han Chung Chang, Chih Hsin Yang, Chien Nan Liu, Jing Yang Jou

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Analog layout is often considered as a difficult task because many layout-dependent effects will impact final circuit performance. In the literature, many automation techniques have been proposed for analog placement and routing respectively. However, very few works are able to consider the two steps simultaneously to obtain the best performance and cost after layout. Most of the routing-aware placement techniques optimize the layout results based on an assumed routing result, which may be quite different to the final layout. In this work, we proposed an automatic two-step layout methodology for analog circuits to alleviate the performance loss during layout process. Instead of using a rough routing prediction during placement stage, a crossing-aware global routing technique is first performed to provide an accurate routing resource estimation of the given compact placement. Then, the improved CDL-based layout migration technique is adopted to do a fast adjustment on the placement and routing to reduce the difference between estimation and final layout while keeping the optimality of the given placement. As shown in the experimental results, the proposed methodology is able to improve the accuracy of routing resource estimation thus improving the final layout quality and circuit performance.

Original languageEnglish
Title of host publicationProceedings of the 2021 Design, Automation and Test in Europe, DATE 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1218-1223
Number of pages6
ISBN (Electronic)9783981926354
DOIs
StatePublished - 1 Feb 2021
Event2021 Design, Automation and Test in Europe Conference and Exhibition, DATE 2021 - Virtual, Online
Duration: 1 Feb 20215 Feb 2021

Publication series

NameProceedings -Design, Automation and Test in Europe, DATE
Volume2021-February
ISSN (Print)1530-1591

Conference

Conference2021 Design, Automation and Test in Europe Conference and Exhibition, DATE 2021
CityVirtual, Online
Period1/02/215/02/21

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