Patent ID: 8732648

Claim:
One or more computer-readable storage media storing computer-executable instructions which when executed by a computer cause the computer to perform a method, the method comprising: receiving semiconductor chip design information, the semiconductor chip design information comprising substrate profile information for a substrate over or under which a circuit design is to be implemented; generating a representation of electrical effects of the substrate at an operating frequency of interest, the representation representing the electrical effects of the substrate as a combined effect of a linear combination of exponentials, wherein the representation is computed by the equation: g N ⁡ ( λ ) ≈ ∑ k = 1 K ⁢ β k ⁢ ⅇ - α k ⁡ ( λ γ 1 ) where α k and β k are real numbers; and storing the representation of the electrical effects of the substrate.