[SI-LIST] Re: TDR S-parameter and correlation
- From: "Chris Cheng" <Chris.Cheng@xxxxxxxx>
- Date: Thu, 30 Aug 2007 16:34:55 -0700
Layer peeling algorithm gets interesting when your discontinuities are =
diverse and different and reflections start to bounce around.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of ronald miller
Sent: Thursday, August 30, 2007 1:22 PM
To: zhenggang.cheng@xxxxxxxxx
Cc: si-list
Subject: [SI-LIST] Re: TDR S-parameter and correlation
Content-Type: text/plain; charset=3Dus-ascii; format=3Dflowed
Content-Transfer-Encoding: 7bit
Hi Zhenggang
Apparently, you are working on S-Parameter data converted from TDR.
If you want to use S-Parameters as your model for simulation it is=20
reasonably accurate.
A much simpler method is avaiable using ADS.
Convert the TDR data to a time/amplitude columns vs Time
Import the data into ADS
Model the circuit using transmission line elements with Frequency=20
Dependent Loss
View the measured TDR and simulated TDR on the same screen
Adjust the parameters of the ADS models and simulate
Continue adjusting the parameters unti the model matches the=20
measrued TDR
This provides a model that cannot be faulted.
So then the eye pattern can be easily simulated with accurate models.
Ron
Once this is done
ZHENGGANG CHENG wrote:
>Hi,
>My question is:
>
>If we TDR (assuming the TDR method is 100% correct) the equivalent =
circuit
>converted using S-parameter, will the result is exactly the same as =
real TDR
>of the same DUT? (assume the converting error and bandwidth are not =
issues)
>Assume this DUT has many large discontinuities inside.
>
>To me, the real TDR can distinguish all the discontinuities inside a =
DUT;
>however, the S-parameter is only the characterization at the ports =
rather
>than inside. Will two equivalent circuits give the same S-parameter but =
have
>two different topologies?
>
>Look froward to your replies.
>
>Thanks,
>
>ZG
>
>
>------------------------------------------------------------------
>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 technical documents are available at:
> http://www.si-list.net
>
>List archives are viewable at: =20
> //www.freelists.org/archives/si-list
>or at our remote archives:
> http://groups.yahoo.com/group/si-list/messages
>Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
> =20
>
>
> =20
>
--=20
Ronald Miller
Ghz Data, Signal Integrity Consulting
7721 Sunset Ave.
Newark CA 94560
tel 510-793-4744
cell 510-377-9380
fax 510-742-6686
www.ghzdata.com
-- Binary/unsupported file stripped by Ecartis --
-- Type: application/msword
-- File: Copy of Models Optimized to TDR.doc
-- Binary/unsupported file stripped by Ecartis --
-- Type: application/msword
-- File: Simulation Waveforms Typical system.doc
------------------------------------------------------------------
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 technical documents are available at:
http://www.si-list.net
List archives are viewable at: =20
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
=20
------------------------------------------------------------------
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 technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
