[SI-LIST] Re: Estimate ISI with S parameters -- Using TDR to do SDD21 correlation?
- From: Scott McMorrow <scott@xxxxxxxxxxxxx>
- To: John@xxxxxxxxxxxx
- Date: Mon, 16 May 2005 23:53:36 -0400
John,
With some of the more recent versions of HSPICE there is a built in PRBS
pulse source. You can use this to excite the s-parameter model and look
at the ISI with an eye display. I think this is the easiest way to get a
feel for ISI. You can certainly also create an impulse pulse and look at
the channel response. There's no reason why you can't also do this in
HSPICE.
As for correlation with only a TDR, this will work well if you set up
the identical simulation with the simulator. You can capture the TDR
pulse from your instrument and create a PWL source with it. Then drive
your simulation with the TDR to see how good the model/measured match is.
Regards,
scott
Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
(401) 284-1827 Business
(401) 284-1840 Fax
http://www.teraspeed.com
Teraspeed is the registered service mark of
Teraspeed Consulting Group LLC
John Lin (ææç) wrote:
>Hi Scott,
>
>Thank you for helps.
>Yes, I can run circuit with s-parameter model. Here, one question. Before, I
>would like to run random pattern for ISI. Recently studying, show only need
>to do pulse response to see
>how the result waveform penetrates to next signal. It makes sense to me and
>also easier to run simulation. Any comments on this method?
>
>Also, I don't have a 4 port VNA to measurement SDD21 for correlation. However
>I have a TDR with only one differential module to measure trace impedance
>(SDD11).
>(I cannot use TDT functions since only one module installed)
>
>Is it reasonable to correlate SDD11 as a indicator for the correlation of
>SDD21? Do I miss something?
>
>Thanks,
>John
>
>
>________________________________
>
>From: Scott McMorrow [mailto:scott@xxxxxxxxxxxxx]
>Sent: Monday, May 16, 2005 9:21 PM
>To: John Lin (ÂLÂÃÂÃ)
>Cc: steve weir; si-list@xxxxxxxxxxxxx
>Subject: Re: [SI-LIST] Re: Estimate ISI with S parameters?
>
>
>John
>
>If you have HSPICE available, you can set up a circuit with s-parameter
>modeling to measure any pattern dependent ISI that you want.
>
>scott
>
>
>Scott McMorrow
>Teraspeed Consulting Group LLC
>121 North River Drive
>Narragansett, RI 02882
>(401) 284-1827 Business
>(401) 284-1840 Fax
>
>http://www.teraspeed.com
>
>Teraspeed(r) is the registered service mark of
>Teraspeed Consulting Group LLC
>
>
>John Lin (ÂLÂÃÂÃ) wrote:
>
> Hi Steve,
>
> Thanks for your helps.
>
> >From other response, it looks like, I need to transfer channel's S =
> parameters into time domain
> and do pulse repsonse to see how the curve at the falling edge =
> penetrates to the period=20
> Of a next signal.
>
> In your mail, ISI is relative to attenuation,SDD21.
>
> I read SAS/SATA spec. There is a ISI compliant curve shown on a SDD21 =
> chart.=20
> The ISI curve is steeper than SDD21 compliant curve.=20
>
> How to generate a ISI curve at the frequency domain by simulation to =
> check if meet the requirement.?
>
> Thanks,
> John
>
>
>
>
> -----Original Message-----
> From: steve weir [mailto:weirsi@xxxxxxxxxx]=20
> Sent: Saturday, May 14, 2005 1:34 AM
> To: John Lin (=AAL=B4=C2=B7=D7); si-list@xxxxxxxxxxxxx
> Cc: John Lin (=AAL=B4=C2=B7=D7)
> Subject: Re: [SI-LIST] Estimate ISI with S parameters?
>
> John variable attenuation versus frequency within the symbol frequency =
> band will give rise to ISI as the amplitude at any given point will =
> depend on the previous history of symbols, and hence the name ISI.
>
> Steve
> At 10:25 AM 5/13/2005 +0800, =3D?big5?B?Sm9obiBMaW4gKKpMtMK31yk=3D?=3D =
> wrote:
>
>
> Dear all SI experts,
>
> Can some ones explain how to relate ISI (inter-symbol
> interference) to=20
> S parameters?
>
> What can be observed from S -parameter for differential 4
> parts=20
> simulation? For example, crosstalk, attenuation,
> reflection,....etc.
>
> Thanks,
> John
>
> ------------------------------------------------------------------
> 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 FAQ wiki page is located at:
> http://si-list.org/wiki/wiki.pl?Si-List_FAQ
>
> List technical documents are available at:
> http://www.si-list.org
>
> 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
>
>
>
>
> ------------------------------------------------------------------
> 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 FAQ wiki page is located at:
> http://si-list.org/wiki/wiki.pl?Si-List_FAQ
>
> List technical documents are available at:
> http://www.si-list.org
>
> 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
>
>
>
>
>
>
>------------------------------------------------------------------
>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 FAQ wiki page is located at:
> http://si-list.org/wiki/wiki.pl?Si-List_FAQ
>
>List technical documents are available at:
> http://www.si-list.org
>
>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
>
>
>
>
>
------------------------------------------------------------------
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 FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
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:
