Analog placement with current flow and symmetry constraints using PCP-SP

Abhishek Patyal, Po Cheng Pan, K. A. Asha, Hung-Ming Chen, Hao Yu Chi, Chien-Nan Liu

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

10 Scopus citations


Modern analog placement techniques require consideration of current path and symmetry constraints. The symmetry pairs can be efficiently packed using the symmetry island configurations, but not all these configurations result in minimum gate interconnection, which can impact the overall circuit routing and performance. This paper proposes the first work that reformulates this problem considering all of them together in the form of Parallel Current Path (PCP) constraints. Then a placement algorithm satisfying these constraints is formulated to reduce a vast search space via efficient sequence pair manipulation. Experimental results show that this formulation and algorithm can satisfy all the constraints in a more tightly packed configuration, resulting in lesser routing length, reduced parasitics and thus better post-layout performance.

Original languageEnglish
Title of host publicationProceedings of the 55th Annual Design Automation Conference, DAC 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781450357005
StatePublished - 24 Jun 2018
Event55th Annual Design Automation Conference, DAC 2018 - San Francisco, United States
Duration: 24 Jun 201829 Jun 2018

Publication series

NameProceedings - Design Automation Conference
VolumePart F137710
ISSN (Print)0738-100X


Conference55th Annual Design Automation Conference, DAC 2018
Country/TerritoryUnited States
CitySan Francisco


  • Analog Layout Synthesis
  • PCP Constraints
  • Sequence Pair


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