Analog/Mixed-Signal Layout Optimization using Optimal Well Taps

S. Ramprasath, Meghna Madhusudan, Arvind K. Sharma, Jitesh Poojary, Soner Yaldiz, Ramesh Harjani, Steven M. Burns, Sachin S. Sapatnekar

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Well island generation and well tap placement pose an important challenge in automated analog/mixed-signal (AMS) layout. Well taps prevent latchup within a radius of influence in a well island, and must cover all devices. Automated AMS layout flows typically perform well island generation and tap insertion as a postprocessing step after placement. However, this step is intrusive and potentially alters the placement, resulting in increased area, wire length, and performance degradation. This work develops a graph-based optimization that integrates well island generation, well tap insertion, and placement. Its efficacy is demonstrated within a stochastic placement engine. Experimental results show that this approach generates better area, wire length and performance metrics than traditional methods, at the cost of a marginal runtime degradation.

Original languageEnglish (US)
Title of host publicationISPD 2022 - Proceedings of the 2022 International Symposium on Physical Design
PublisherAssociation for Computing Machinery
Pages159-166
Number of pages8
ISBN (Electronic)9781450392105
DOIs
StatePublished - Apr 13 2022
Event31st ACM International Symposium on Physical Design, ISPD 2022 - Virtual, Online, Canada
Duration: Mar 27 2022Mar 30 2022

Publication series

NameProceedings of the 2022 International Symposium on Physical Design

Conference

Conference31st ACM International Symposium on Physical Design, ISPD 2022
Country/TerritoryCanada
CityVirtual, Online
Period3/27/223/30/22

Bibliographical note

Publisher Copyright:
© 2022 ACM.

Keywords

  • ams layout automation
  • analog circuits
  • circle graph
  • jordan curve
  • mixed-signal circuits
  • well island generation
  • well tap sharing

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