Hello,
I have a switched cap 4th order low pass filter which is differential in nature.
I can do transient/pss/pxf simulations without any problem on a netlist generated from a schematic.
However, I do not see any meaningful outputs when I try to simulate the same circuit using layout extracted parasitics (R+C).

The # of nodes is 31174, # of bsim3v3 is 2881, bourse_1 is 755, capacitors is 50100, resistors are 40022.
With this size netlist, the transients and the pss simulations do not start properly. The opamp outputs hit the rails, the moment the clocks start.

I read spectre.ic from readic menu, I use +parasitics and +csfe to minimize the # of parasitics.

Any help will be greatly appreciated

thanks
analog2000

I am setting the initital conditions with a spectre.ic file that I created when doing transient on the schematic based net list earllier. I am setting skipdc=yes to force the simulator to use the ic on all relevant nets so dc op should not be necessary to run
Yes, the layout is lvs/drc clean
analog2000