Patent ID: 8595663

Claim:
A modeling method comprising: accessing, by a computer from a memory, a design for a circuit, said circuit comprising: a diffusion region; a contact bar electrically connected to and traversing said diffusion region; and an additional interconnect structure electrically connected to said contact bar; and developing, by said computer, a total resistance expression associated with said contact bar, said developing of said total resistance expression comprising: demarcating sections of said contact bar based on a location of said additional interconnect structure on said contact bar and relative to said diffusion region; for each of said sections, establishing section-specific current density boundary conditions, developing section-specific sheet current density expressions that satisfy both said section-specific current density boundary conditions and a stable current flow continuity equation, and developing a section-specific resistance expression using said section-specific sheet current density expressions; and developing said total resistance expression for said contact bar by summing all section-specific resistance expressions of all of said sections.