I am trying to layout interdigitated electrodes (attached image) in the top metal layer in CMOS 180nm. I was wondering how I can extract the parasitic capacitance between the two electrodes.
If you are working in a mature, "big name" tool from a
foundry that does good PDKs, the parasitics extraction
should cough up a capacitor for this structure and you
could dig for it in the analog_extracted (or whatever, if
it's not Brand C) view by select-by-net or selecting the
instance by area. If you put probes on both nets then
which of the many pcapacitor instances is the right one
will be visually obvious.