Patent ID: 7392490

Claim:
A method, implemented by a computer device, of modeling capacitance for a subject structure comprising a pair of long conductors surrounded by a dielectric material and supported by a substrate, wherein the capacitance of the conductors is a function of current frequency, the method comprising: receiving, at said computer device, parameters characterizing said surrounding dielectric material of said subject structure as a first dielectric with a first permittivity (ε 1 ) and the substrate as a second dielectric with a second permittivity (ε 2 ); providing, at said computer device, a known capacitance (C 2 ) value of a basis structure characterized as having a surrounding dielectric material of same first permittivity (ε 1 ) and a substrate of a second permittivity (ε 2 ) different than said second permittivity of said subject structure and having a same cross-sectional geometry of said subject structure; modeling, at said computer device, the capacitance (C 1 ) of said subject structure for values of the first and second permittivity (ε 1 , ε 2 ) based on known capacitance (C 2 ) computed for said basis structure with the same first permittivity (ε 1 ) and a different second permittivity (ε 2 ), and using said modeled capacitance (C 1 ) for design of an integrated circuit having said subject structure.