[SI-LIST] Re: Ask help for s-parameter simulation
- From: Tracy Barclay <Tracy.Barclay@xxxxxxxxxxxx>
- To: "zhanglub@xxxxxxxxxx" <zhanglub@xxxxxxxxxx>
- Date: Thu, 26 Feb 2009 09:29:04 -0800
Hi Lucian,
In addition to Aubrey's advice, I recommend that you save the waveform file(s)
as binary by setting
.option POST $ or POST=1, binary format
Instead of using the ASCII file format
.option POST=2 $ ASCII format
The POST_VERSION=2001 option will save the waveform file as double precision
and will improve the waveform resolution if you are using POST=2 option.
Tracy Barclay
CAE
Synopsys, Inc.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Aubrey_Sparkman@xxxxxxxx
Sent: Thursday, February 26, 2009 8:16
To: zhanglub@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [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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