How to set up initial conditions for post-layout simulation?

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maksimtpl

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Hello everybody,

I kind of new in the simulation tools (cadance). I wan to ask how I gonna set initial condition for my circuit with "extracted" (post simulation) juz like when in schematic. I need to setup some initial conditions in order to make the system converge. Can anybody tell me how to do that because is quite urgent for me?

Thanks you.

---------- Post added at 01:22 ---------- Previous post was at 01:11 ----------

btw my post-layout simulation in Calibre
 

maksimtpl said:
... how I gonna set initial condition for my circuit with "extracted" (post simulation) juz like when in schematic.
Click to expand...

Same procedure as in schematics. Just find the corresponding node names.
Hint: If you label these nodes in layout, they'll keep their names in the extracted netlist.
 

Because of node- and element-bloat in the extracted netlist,
you may need to allow the simulator more iterations to get
convergence done.

Working through a series of degreasing gmin, starting from
something like 1E-9 (everybody leaks 1nA) and backing down
to default level, can give you a good restore file.
 

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