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Symmetry-aware TCG-based placement design under complex multi-group constraints for analog circuit layouts

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2 Author(s)
Rui He ; Fac. of Eng. & Appl. Sci., Memorial Univ. of Newfoundland, St. John''s, NL, Canada ; Lihong Zhang

This paper presents a solution to handling complex multi-group symmetry constraints in the placement design using transitive closure graph (TCG) representation for analog layouts. We propose a set of symmetric-feasible conditions, which can automatically satisfy symmetry requirements. We also develop a new contour-based packing scheme with time complexity of O(g·n·lgn), where g is the number of symmetry groups and n is the number of the placed cells. Furthermore, we devise a set of perturbation operations with time complexity of O(n). Our experimental results show the effectiveness and superiority of this proposed scheme compared to the other state-of-the-art placement algorithms for analog layout design.

Published in:

Design Automation Conference (ASP-DAC), 2010 15th Asia and South Pacific

Date of Conference:

18-21 Jan. 2010