Patent US 9,129,079

Any primitive cells or blocks can be represented physically by a Barycenter compact model, and any black box model can also be physically represented by a Barycenter compact model physically. A hierarchical boundary condition between blocks is formulated by the Barycenter model or Barycenter compact model. Hierarchical boundary condition problems between blocks can be limited within two levels only if using the Barycenter model or Barycenter compact model.