SAGERoute: Synergistic Analog Routing Considering Geometric and Electrical Constraints with Manual Design Compatibility

Abstract

Routing is critical to the post-layout performance of analog circuits. As modern analog layouts need to consider both geometric constraints (e.g., design rules and low bending constraints) and electrical constraints (e.g., electromigration (EM), IR drop, symmetry, etc.), it becomes increasingly challenging to investigate the complicated design space. Most previous work has focused only on geometric constraints or basic electrical constraints, lacking holistic and systematic investigation. Such an approach is far from typical manual design practice and can not guarantee post-layout performance on real-world designs. In this work, we propose SAGERoute, a synergistic routing framework taking both geometric and electrical constraints into consideration. Through Steiner tree based wire sizing and guided detailed routing, the framework can generate high-quality routing solutions efficiently under versatile constraints on real-world analog designs.