luke/magic - magic - Gitea: Git with a cup of tea

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Added an important new method: If the keyword "fringeshieldhalo" is specified in the extraction section of the techfile, then magic will compute the effect of a nearby shape partially shielding the sidewall overlap capacitance, which approaches 100% shielding as the shapes converge to zero separation. This method prevents magic from vastly overestimating the fringe capacitance of closely spaced wires, which was magic's worst problem with parasitic accuracy. The "fringeshieldhalo" value is the distance at which the fringe shielding becomes negligible. Typically, it will be about three times the distance at which half the fringe value is shielded. It may be necessary at some point to make both the fringe shielding halo and the sidewall halo values per-type values (or per-plane, at least). For now, it should suffice to bring Magic's parasitic extraction back in line with other tools.

2022-03-17 22:35:41 +01:00

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