[SI-LIST] Re: Convergence problem after inserting detailed connector model
- From: "Jon Powell" <jonpowell@xxxxxxxxxxxx>
- To: <julia.nekrylova@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 19 Feb 2004 20:08:11 -0800
I often wonder if anyone from Synopsis bothers to monitor this list. I don't
recall ever
seeing any advice from them, even though a vast majority of SI persons (at
least on this list) seem to be
using HSPICE for at least part (if not all) of their SI work. It has long
been an area of amusement and sorrow to me
that the most used (and arguably best) simulation tool is owned by an IC
simulation house that really doesn't care about the PCB market or simulation
thereof.
Note: I am not criticizing Synopsis. They are in the IC business and it is
not their fault if everyone wants to use HSPICE to simulate PCB's.
Julia,
The problem you are seeing I have seen often but I can't remember the HSPICE
option settings that you can use to make it
go away. I don't believe that you have to do Frequency only sweeps for long
transmission lines cause I have simulated TLINES of greater that 10 feet in
HSPICE and got answers almost as good as XTK. I hope that an HSPICE guru
will chime in.
anytime now
jon
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Nekrylova, Julia
Sent: Thursday, February 19, 2004 5:06 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Convergence problem after inserting detailed
connector model
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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