Analog placement with symmetry and other placement constraints

In order to handle device matching in analog circuits, some pairs of modules are required to be placed symmetrically. This paper addresses this device-level placement problem for analog circuits and our approach can handle symmetry constraint and other placement constraints simultaneously. The problem of placing devices with symmetry constraint has been extensively studied but none of the previous works has considered symmetry constraint with other placement constraints simultaneously. Instead of handling the constraints by having a penalty term in the cost function to penalize violations, a unified method is proposed that, by adjusting the edge weights in a pair of constraint graphs, can try to satisfy all the placement and symmetry constraints simultaneously in a candidate floorplan solution. The maximum distance of the modules in a symmetry group from the corresponding symmetry axis will be minimized in this weight adjusting step, in order to minimize the total packing area. We h...

• Type: Conference
• Year: 2006
• Where: ICCAD
• Authors: Yiu-Cheong Tam, Evangeline F. Y. Young, Chris C. N. Chu
• Keywords: Corresponding Symmetry Axis, Hardware, ICCAD 2006, Placement Constraints, Symmetry Constraints