[SI-LIST] Re: Ask help for s-parameter simulation

What version of HSPICE are you using?  I remembered a problem I had back
in late 2005.  The displayed data lost precision after 100ns and looked
"blocky".

Try the following:
If you are looking at the data in the .tr0 file with Cosmoscope, use
.option post_version=2001
If you are looking at the data in the .lis file with SigWave, use
.option NUMDGT=8 (or some other value that gives the needed precision.
If you are looking at the data in the .mt0 file, use .option MEASDGT=xxx
where xxx is some large enough to display the expected resolution.

Good luck!

Aubrey Sparkman 
PG Signal Integrity Team 
Dell, Inc. 
Aubrey_Sparkman@xxxxxxxx 
(512) 723-3592 

"It is not the strongest of the species that survives, nor the most
intelligent, but the one most responsive to change." - Charles Darwin


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Lucian Zhang
Sent: Thursday, February 26, 2009 4:15 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Ask help for s-parameter simulation

Content-Type: text/plain; charset="US-ASCII"
Dear all,

In one of my simulation work, the Board parameter is extracted as
S-parameter, include cupper, capacitors, inductors.

The simulator is Hspice.

The problem is, when the simulation time is set as 100ns or 1000ns, the
waveform of the first 100ns is different a lot.

Who can tell me that is why and how to adjust it?

Thank you.
  











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