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

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(1) Corrected an error in generating GDS_FILE properties when reading GDS files, caused by an unneeded change to pass both the "original" filename and the actual filename when handling compressed files---The original filename is unneeded. (2) Implemented several new methods for parasitic extraction. The first is an option offset value to apply to sidewall calculations. This handles issues where actual wire separation is different from drawn wire separation, which can be significant for the 1/d calculation of sidewall coupling. The second method is to use the recently-added fringe halo to compute the coupling of the fringe capacitance to nearby wires. Prior to this change, all fringe capacitance was applied to surfaces directly under a wire edge as if the fringe capacitance did not extend outward from the edge. Now the capacitance is properly pro-rated for the position of any overlapped shape inside the fringing field. Finally, the third method added is a new search algorithm for finding the nearest shapes along the length of a boundary. This is used for sidewall coupling and fringe shielding, where the nearest shape dominates the coupling, and any shapes behind are shielded and may (to first order) be ignored. Previously, the entire halo was searched without regard to shapes shielding other shapes behind, and a recent correction added an ad-hoc search for blocking shapes that was inefficient and not always correct. The new method is both efficient and accurate.

2022-05-28 16:33:21 +02:00

8.3.306