[SI-LIST] hspice convergence problem

  • From: Leo Hu <leohu@xxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Mon, 21 Aug 2006 14:41:32 +0800

Dear All,
When I made a simulation case in hspice, weak condition was coucluded, but 
typ/strong condition was aborted and 
told me--internal timestep is too small.

Because firstly I used RMIN default value(1e-9) in my netlist, then I try to 
adjust RMIN value to smaller one(such as 
1e-15,and 1e-16 hspice tells me it is out of bounds) owing to convergence 
problem mentioned above.
But new simulation is still failed. I want to know if this solution is correct?

Due to RMIN modification being not take effect, I also try to set .OPTION 
DELMAX=25ps(in my netlist,I set
.tran 25ps 30ns). But new simulation is still failed. I want to know if this 
solution is correct?

If above two solutions are effective methods to resolve internal timestep is 
too small convergence problem,
what are reasonable values for them? 

And if they are wrong methods, Could you please tell me right ones?

Thanks and Best Regards!

Leo Hu 


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