[SI-LIST] Re: HSPICE query
- From: <kiran.kumar10@xxxxxxxxx>
- To: <kevin.voegele@xxxxxxxxxxxxxxxx>
- Date: Wed, 20 Jun 2012 06:00:01 +0000
Hi Kevin,
The model does not include any transmission line. It is just a connector model.
Also it is HSPICE tool related query, the model is fine.
Please let me know if you have any more suggestions.
Thanks in advance.
Best Regards,
Kiran
From: kevin.voegele@xxxxxxxxxxxxxxxx [mailto:kevin.voegele@xxxxxxxxxxxxxxxx]
Sent: Tuesday, June 19, 2012 9:49 PM
To: Kiran Kumar (WT01 - Manufacturing & Hi Tech)
Cc: si-list@xxxxxxxxxxxxx; si-list-bounce@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] HSPICE query
Kiran,
What is the length of the transmission line in the simulation? If you can
insert a 100 Ohm differential impedance line in the path you may spread apart
the high frequency constructive/destructive peaks in the S11 (or S22) results.
I am thinking your data comes from a test board so there is a PCB trace in the
measurement. If you built your test bench without this T-line, then you will
have very high frequency "noise" in the return loss.
L ~ C/2(SQRT (Er)*delta F
So if length of the T-line in your test bench is very short (like package only)
then the delta frequency between constructive and destructive interference will
be low and appear as "noise" as you describe.
I would insert a W-element model in the path, after the package to the port to
add length to make the delta F higher. Make it 10 cm or longer. You can adjust
this length until you match the insertion loss curve you received. Then you
will know the test board topology used to make the measurement in the first
place.
Of course I may not completely understand your issue in the first place but it
sounds familiar.
Regards,
Kevin
*******************************************************
Kevin Voegele
Design Engineering Manager
Toshiba America Electronic Components, Inc
Minneapolis Design Center
ph. 952.842.2476 FAX 952.893.8031
cell 952.334.1015
e-mail: kevin.voegele@xxxxxxxxxxxxxxxx<mailto:kevin.voegele@xxxxxxxxxxxxxxxx>
*******************************************************
From: <kiran.kumar10@xxxxxxxxx<mailto:kiran.kumar10@xxxxxxxxx>>
To: <si-list@xxxxxxxxxxxxx<mailto:si-list@xxxxxxxxxxxxx>>,
Date: 06/19/2012 01:13 AM
Subject: [SI-LIST] HSPICE query
Sent by:
<si-list-bounce@xxxxxxxxxxxxx<mailto:si-list-bounce@xxxxxxxxxxxxx>>
________________________________
Hi,
I am working on a project that uses a 6-pair X 4-wafer connector with 24
differential pairs of 100Ohms differential impedance. Vendor provided a single
ended S-parameter connector model for the same.
When I use HSPICE port element(P-element) and .LIN command to convert the
single ended parameter to differential and plot the Return Loss in Custom
Waveview, I am getting very bad noise in the frequency range up to 10G (noise
frequency of 100MHz). But if I use the original single ended S-parameter file
directly and use port conversion formula (eg. S11DD= S11-S13+S31+S33 for each
port) Then I am getting a clean Return Loss plot as the plot provided by the
vendor.
The port conversion using P-element is introducing noise in the generated
differential S-parameter model.
Can someone help me get around this issue?
Please revert back if the question is not clear.
Thanks in advance.
Best Regards,
Kiran
Please do not print this email unless it is absolutely necessary.
The information contained in this electronic message and any attachments to
this message are intended for the exclusive use of the addressee(s) and may
contain proprietary, confidential or privileged information. If you are not the
intended recipient, you should not disseminate, distribute or copy this e-mail.
Please notify the sender immediately and destroy all copies of this message and
any attachments.
WARNING: Computer viruses can be transmitted via email. The recipient should
check this email and any attachments for the presence of viruses. The company
accepts no liability for any damage caused by any virus transmitted by this
email.
www.wipro.com
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx<mailto:si-list-request@xxxxxxxxxxxxx> with
'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx<mailto:si-list-request@xxxxxxxxxxxxx> with 'help'
in the Subject field
List forum is accessible at:
http://tech.groups.yahoo.com/group/si-list
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Please do not print this email unless it is absolutely necessary.
The information contained in this electronic message and any attachments to
this message are intended for the exclusive use of the addressee(s) and may
contain proprietary, confidential or privileged information. If you are not the
intended recipient, you should not disseminate, distribute or copy this e-mail.
Please notify the sender immediately and destroy all copies of this message and
any attachments.
WARNING: Computer viruses can be transmitted via email. The recipient should
check this email and any attachments for the presence of viruses. The company
accepts no liability for any damage caused by any virus transmitted by this
email.
www.wipro.com
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List forum is accessible at:
http://tech.groups.yahoo.com/group/si-list
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
