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From: R. Timothy Edwards (tim AT stravinsky DOT jhuapl.edu) Date: Mon Nov 17 2003 - 13:50:53 EST
Dear Thomas, > I'm using the latest revision (rev 56) of version 7.2. I noticed that > if I use 'scalegrid 1 9' in a layout using .18um tech file that fet > dimensions scale nicely, but capacitances do not (using extract do all; Bad typo in the source code (my fault, I'm afraid). If you did "scalegrid 1 9; scalegrid 9 1" several times, you'd see the capcitance go completely out of control. The fix is that extract/ExtTech.c, line 1738, should be: style->exts_overlapCap[i][j] /= sqd; *NOT* style->exts_overlapCap[i][j] *= sqd; (everywhere else capacitances multiply by the numerator, divide by the denominator; obviously a very unfortunate typo!). Apparently the test cases I used did not have significant overlap capacitance, so the error was buried in the (correctly scaled) area capacitance. The error will be fixed in the 7.2 distribution immediately. Thanks for finding it and bringing it to my attention! Regards, Tim
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