carlgrace
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OK, so this feels a bit like an echo chamber, but I sorted the issue out and I'm going to update everyone in case someone else gets a new job where Eldo is used. Basically, the state syntax .PLOT DC S(M0->CGG) only gives a portion of CGG. In fact, according to the Eldo .chi file CGG = CGG + CGDO + CGSO. This is confusing enough that they use CGG to mean two different things (namely, intrinsic gate capacitance and total gate capacitance), but CGDO and CGSO are not available using the state syntax. So, basically, what I was trying to do would not work.
Luckily, there is another way in Eldo. You can use the .PLOT command to get a large number of device parameters directly. For example, .PLOT DC CGG(M0) gives the total gate capacitance. Seems so simple, now, but that 1000 page Eldo manual is formidable!
Carl
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