[SI-LIST] Re: hspice convergence problem
- From: steve weir <weirsi@xxxxxxxxxx>
- To: leohu@xxxxxxxxxx,si-list@xxxxxxxxxxxxx
- Date: Mon, 21 Aug 2006 02:20:04 -0700
Leo it is an old SPICE convergence problem. There are various
methods of attacking it which you should be able to find in your
HSPICE documentation. Adjusting the parameters to the gear method
such as relative tolerance is one. Adjusting the netlist is another.
Steve.
At 11:41 PM 8/20/2006, Leo Hu wrote:
>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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