Analog Placement Based on Symmetry-Island Formulation

Abstract

Abstract-To reduce the effect of parasitic mismatches and circuit sensitivity to thermal gradients or process variations for analog circuits, some pairs of modules need to be placed symmetrically with respect to a common axis, and the symmetric modules are preferred to be placed at closest proximity for better electrical properties. Most previous works handle the problem with symmetry constraints by imposing symmetric-feasible conditions in floorplan representations and using cost functions to minimize the distance between symmetric modules. Such approaches are inefficient due to the large search space and cannot guarantee the closest proximity of symmetry modules. In this paper, we present the first linear-time-packing algorithm for the placement with symmetry constraints using the topological floorplan representations. We first introduce the concept of a symmetry island which is formed by modules of the same symmetry group in a single connected placement. Based on this concept and the B * -tree representation, we propose automatically symmetric-feasible (ASF) B * -trees to directly model the placement of a symmetry island. We then present hierarchical B * -trees (HB * -trees) which can simultaneously optimize the placement with both symmetry islands and nonsymmetric modules. Unlike the previous works, our approach can place the symmetry modules in a symmetry group in close proximity and significantly reduce the search space based on the symmetry-island formulation. In particular, the packing time for an ASF-B * -tree or an HB * -tree is the same as that for a plain B * -tree (only linear) and much faster than previous works. Experimental results show that our approach achieves the best-published quality and runtime efficiency for analog placement.

Today’s computing challenges: opportunities for computer hardware design

“…However, in fact, it is hard to say we can do it for the layout design in the near future because there are only a few ways to do it right, however there are billions of ways to do it wrong. That means, to make the automation tool work correctly, a designer should constrain the tools very precisely (Habal & Graeb, 2011;Lin, Chang & Lin, 2009), so they spend most of the design time constraining the tools, which is not very efficient (Chang et al, 2018). That is the main reason why the engineers in this field rarely use such automation tools.…”