[SI-LIST] Re: HSPICE DC Convergence Problem
- From: "Mirmak, Michael" <michael.mirmak@xxxxxxxxx>
- To: <esayre@xxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Sun, 1 Oct 2006 20:47:28 -0700
Ed,
Are you attempting to get a transient simulation off the ground with
S-parameter data? If so, 200 MHz may be too high a starting frequency.
Some tools may extrapolate to 0 Hz but there may not be enough
information for the extrapolation to provide realistic results.
Have you tried adding a guaranteed-passive 0 Hz data point to the
S-parameter data? Or simply extract the S-parameter data starting at a
much lower frequency before running the transient analysis?
Just a few thoughts...
- Michael Mirmak
Intel Corp.=20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of esayre@xxxxxxxx
Sent: Sunday, October 01, 2006 12:23
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] HSPICE DC Convergence Problem
Folks:
I'm running an HSPICE S-Parameter based transient (.TRAN) and frequency
(.AC) simulations on a 16 x 16 S-Parameter Touchstone matrix (4-diff
ports in and 4-diff ports out). I have appropriately matched diff
sources and 50 ohm terminations to ground. I have referenced everything
to global ground "0" and removed all pad and via capacitances. The 16 x
16 matrix elements are complex single ended and start at 200 MHz and
extend to 20 GHz. =20
I'm using HSPICE version 2004.x. In the .TRAN simulations, the sources
start from zero so there is no difficulty with having DC value problems
at t =3D 0. For some reason, I can't seem to get to first base on this,
namely DC convergence, so neither of the simulations proceeds to its
purpose. =20
Any suggestions gratefully appreciated.
Dr. Edward P. Sayre, P. E.
North East Systems Associates, Inc.
1 South Avenue, 3rd Floor
Natick, MA 01760
[T] 508-652-0088
[F] 508-652-0083
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=20
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