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Several important fixes to the handling of coupling capacitance,

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which had become fouled up due to the changes in the way that the
substrate is defined and handled.  Worked through a large torture
test until all types of substrate coupling and overlap shielding
were resolved to be extracted as expected.
This commit is contained in:
Tim Edwards
2022-02-23 20:57:30 -05:00
parent 505155497e
commit 16c0a65adc
2 changed files with 23 additions and 53 deletions
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extract/ExtCouple.c
+8 -14
View File
@@ -867,15 +867,8 @@ extSideOverlap(tp, esws)
}
/* Add in the new capacitance. */
if (tb == TT_SPACE)
{
/* Is tp a space tile? If so, extGetRegion points to garbage;
* make terminal 2 point to ground.
*/
rbp->nreg_cap += cap;
if (CAP_DEBUG) extNregAdjustCap(rbp, cap, "sideoverlap_to_subs");
}
else
if (tb != TT_SPACE)
{
int oa = ExtCurStyle->exts_planeOrder[esws->plane_of_boundary];
int ob = ExtCurStyle->exts_planeOrder[esws->plane_checked];
@@ -900,12 +893,13 @@ extSideOverlap(tp, esws)
rbp->nreg_cap -= subcap;
/* Ignore residual error at ~zero zeptoFarads. Probably */
/* there should be better handling of round-off here. */
if ((rbp->nreg_cap > -0.001) && (rbp->nreg_cap < 0.001)) rbp->nreg_cap = 0;
if ((rbp->nreg_cap > -0.001) && (rbp->nreg_cap < 0.001))
rbp->nreg_cap = 0;
if (CAP_DEBUG)
extNregAdjustCap(rbp, -subcap, "obsolete_perimcap");
} else if (CAP_DEBUG)
extNregAdjustCap(rbp, 0.0,
"obsolete_perimcap (skipped, wrong direction)");
extNregAdjustCap(rbp, -subcap, "obsolete_perimcap");
}
else if (CAP_DEBUG)
extNregAdjustCap(rbp, 0.0, "obsolete_perimcap (skipped, wrong direction)");
/* If the nodes are electrically connected, then we don't add */
/* any side overlap capacitance to the node. */