At sub-5nm process nodes, interconnect performance has overtaken gate delay as the main constraint on power, performance, and area. Vias are a particular weak point: their resistance rises sharply as dimensions shrink, worsening electromigration and IR drop. Manual insertion of redundant vias, once a common mitigation, is no longer practical given the density and complexity of advanced layouts.
Traditional place-and-route tools offer only basic via redundancy. They rely on simplified design rules, lack full signoff awareness, and often skip congested regions where reinforcement is most needed. When router-based enhancements trigger signoff violations, teams face late engineering change orders that can delay projects by weeks.
The article describes a shift-left methodology that brings signoff-quality analysis into the implementation phase. An automated enhancement platform scans the layout for valid redundant-via locations, respecting multi-patterning and voltage-aware rules, then inserts vias on selected power or signal nets. It is also designed to be short-resilient, handling imperfect layout data without crashing or producing illegal changes. The result is a more robust interconnect with lower resistance and improved electromigration margins, achieved without disrupting the overall design flow.