Hi all,
Appreciate informative feedback on this. It looks like Oracle paper sums upÂ
the root of my question - and actually opens up the second aspect of all this
is that we'd like to assure material loss variations. Anyone else out there
requesting their suppliers for this details? If yes, what is the most common
format shared by the suppliers? What are loss common loss deviation targets?
Thanks,Lenny R
On Wednesday, August 19, 2015 12:31 PM, "Grasso, Charles"
<Charles.Grasso@xxxxxxxxxxxx> wrote:
Trust but verify!
Best Regards
Charles Grasso
Compliance Engineer
Echostar Communications
(w) 303-706-5467
(c) 303-204-2974
(t) 3032042974@xxxxxxxxx
(e) charles.grasso@xxxxxxxxxxxx
(e2) chasgrasso@xxxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of L R
Sent: Tuesday, August 18, 2015 3:15 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Why do we still TDR pcbs
 Hi folks,
See lots of discussion this month on whether SI has become commoditized. I'll
hold off my thoughts on that... and instead ask my
"too-ashamed-to-ask-but-will-ask-anyways" question.
The question is this. Why do we still insist on board impedance data from our
PCB manufacturers?
Here's the rationale behind this question As we all know too well, PCB trace
impedance is not a nice constant real value (say 50 ohms) so we can't really
expect a single number(right?). And with that said, PCB manufactures never
provide us with the details of their measurement (edge rates, launches, ref
planes anyone?). They just give us a number saying they are within 10%.
Great.  We know nothing from this other than I can sleep better at night
knowing my, say, single ended clocks will work fine. Well, how useful is allÂ
that for links designed for my fancy 10Gbps or more? Wouldn't it be more useful
for them to give us S11/22?
- Lenny
------------------------------------------------------------------
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:Â Â
      //www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
      http://www.qsl.net/wb6tpu
Â
------------------------------------------------------------------
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:Â Â
      //www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
      http://www.qsl.net/wb6tpu
Â
------------------------------------------------------------------
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
