[SI-LIST] Re: Convergence problem after inserting detailed connector model
- From: "Guo Yawei" <ywguo527@xxxxxxxxxxx>
- To: julia.nekrylova@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Sun, 22 Feb 2004 09:18:29 +0800
Julia,
Set GMINDC and GMAX in .option. The default value of GMINDC is 1.0e-12. A
larger value will tend to easy convergence, but poor accuracy at the same
time. The default value for GMAX is 100 mho. Try a very small value, such
as 6.
If it still fails, try a ramped voltage source for supply voltage.
Of cause you should use smaller time step and set method=gear when using
the above methods.
In one word, convergence problem is boring.
Good luck!
Yawei Guo
>From: "Nekrylova, Julia" <julia.nekrylova@xxxxxxxxx>
>Reply-To: julia.nekrylova@xxxxxxxxx
>To: <si-list@xxxxxxxxxxxxx>
>Subject: [SI-LIST] Convergence problem after inserting detailed connector
model
>Date: Thu, 19 Feb 2004 17:06:07 -0800
>
>Hello,
>
>
>I've added a detailed connector model to my Hspice deck and started
>getting
>
>"internal timestep too small" error messages. Before that the connector
>was represented just by
>
>RLGC matrix model. Tried different fixes: reduced transition times, set
>initial conditions,
>
>tried gear method, put shunt conductances and capacitances. Some times
>in the past Accurate=1 and
>
>Converge=4 worked for me, but this time nothing seems to help.
>
>
>
>What else I could try? I am pretty sure there are lots of people on the
>list who had similar problems
>
>with their spice decks after adding sophisticated interconnect models.
>
>What could be the most popular solution in this case besides talking to
>the connector company application engineer?
>
>
>
>Thanks a lot,
>
>Julia
>
>
>
>
>
>
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