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Added a new "devresist" type "terminal" to account for resistor 

terminal resistance, for cases where the resistor value is
estimated and output along with (or instead of) the physical
length and width or area and perimeter.  Corrected the "area"
and "perimeter" type handling so that they combine in parallel,
not in series (note that "perimeter" resistance is just an area
resistance with the depth of the material factored in).
This commit is contained in:
R. Timothy Edwards 2025-10-07 12:12:33 -04:00
parent 3631892cfa
commit 656d27b17a
2 changed files with 24 additions and 10 deletions
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2
VERSION
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@ -1 +1 @@
8.3.557
8.3.558

32
extract/ExtBasic.c
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@ -1867,12 +1867,13 @@ extOutputDevParams(reg, devptr, outFile, length, width, areavec, perimvec)
* extTransRec.tr_perim));
break;
case 'r':
/* If the device has an "area" resistance specified
* by "devresist" in the tech file, use that. If
* it has a "perimeter" resistance specified, use
* that as well. If neither, then find the sheet
* resistance of the device identifier layer and
* use that.
/* If the device has an "area" resistance specified by
* "devresist" in the tech file, use that. If it has a
* "perimeter" resistance specified, use that as well. If
* neither, then find the sheet resistance of the device
* identifier layer and use that. When using sheet
* resistance, check if there is a devresist "terminal"
* value, indicating terminal resistance per unit length.
*/
resvalue = (ResValue)0.0;
he = HashLookOnly(&extTransRec.tr_devrec->exts_deviceResist, "area");
@ -1888,13 +1889,26 @@ extOutputDevParams(reg, devptr, outFile, length, width, areavec, perimvec)
ResValue perimr;
perimr = (ResValue)(pointertype)HashGetValue(he);
perimr /= (ResValue)extTransRec.tr_perim;
resvalue += perimr;
/* Perimeter and area resistances combine in parallel */
resvalue = (ResValue)(1.0 / ((1.0 / (double)perimr) +
(1.0 / (double)resvalue)));
}
}
else
{
resvalue = ExtCurStyle->exts_sheetResist[reg->treg_type]
* (double)length / (double)width;
resvalue = (ResValue)(
(double)ExtCurStyle->exts_sheetResist[reg->treg_type]
* (double)length / (double)width);
he = HashLookOnly(&extTransRec.tr_devrec->exts_deviceResist,
"terminal");
if (he != NULL)
{
ResValue termr;
termr = (ResValue)(pointertype)HashGetValue(he);
resvalue += termr * width;
}
}
fprintf(outFile, " %c=%g", chkParam->pl_param[0], (float)resvalue);