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This paper presents a solution to handling the symmetry and substrate-sharing constraints in the placement design using transitive closure graph (TCG) representation for analog layouts. We propose a new contour-based packing scheme to implement substrate-sharing constraints with the time complexity of O(p· n·lgn), where p is the number of symmetry groups and n is the number of the placed cells. Furthermore,...
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...
This paper presents a solution to handling multiple 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 guarantee symmetric placement of sensitive cells with respect to multiple symmetry axes for reduction of parasitic mismatch and thermal gradients. We also develop a new contour-based...
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