Is there any way to change the scale of the transistor in magic before using ext2spice? I am using the sky130A.tech file, which has

scalefactor 10 nanometers

but the extracted spice file has:

* SPICE3 file created from comparator.ext - technology: sky130A

.option scale=10000u

Is this a problem in magic or in the extraction?

Use

ext2spice lvs

before setting any other options, as this sets a number of "sane" options, including

ext2spice format ngspice

and

ext2spice scale off

, both of which are necessary for this process (if you are looking for parasitics in the output, you should do

ext2spice lvs

, which turns them off, followed by

ext2spice cthresh 0

, which turns them back on. It's awkward, but it's still preferable to remembering eight different configuration settings for

ext2spice

).