Patent ID: 7276399

Claim:
A method for designing a plurality of electrical paths in a substrate used for coupling to a die, the substrate having a plurality of layers, the method comprising: receiving a report identifying end connection points for the plurality of electrical paths; dividing the plurality of electrical paths into sections including a first end section, an intermediate section, and a second end section; selecting modular cells for the first end section and the second end section, the modular cells being a first end modular cell having a plurality of first end electrical paths defined by a first common constraint and a second end modular cell having a plurality of second end electrical paths defined by a second common constraint; selecting the first common constraint based on one of the plurality of first end electrical paths having the greatest limitation on the first common constraint; and connecting the first end modular cell to the second end modular cell with transmission lines to form the plurality of electrical paths, the transmission lines corresponding to the intermediate section.