[SI-LIST] AW: Re: Insertion Loss, Return Loss, ILD, UNi versus Dual stripline
- From: "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>
- To: "Haller, Robert" <rhaller@xxxxxxxxxxxxx>, "Katkoria, Deepak" <Katkoria.Deepak@xxxxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Thu, 5 Aug 2010 16:43:01 +0200
Robert,
The difference in loss will not be significantly enough to quantify, especially
because option two will have less dielectric thickness when the tracewidth of
option 1 and 2 are equal.
Return loss differences will not be significantly different too, when the
impedance is kept the same.
ILD doesn't help, because it is affected by impedance discontinuities along the
channel. Looking at the traces only will give a pretty flat ILD response.
Depending on the pair separation you will see unsymmetry between the lines of a
pair. This unsymmetrie will possibly lead to mode conversions and/or x-talk. If
the spacing is rather short, you should be able to see an impedance difference
of each single trace of the differential pair.
For your task of quantifying the difference, I would go for x-talk (or
isolation).
BR
Gert
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-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
Auftrag von Haller, Robert
Gesendet: Donnerstag, 5. August 2010 16:07
An: Katkoria, Deepak; si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] Re: Insertion Loss, Return Loss, ILD, UNi versus Dual
stripline
ASCI Graphics did not come through correctly- will try again. I know the first
option is preferable, and I know I can (and have) measured the Loss. What I am
trying to quantify is Specifically Which S parameter(s) I can use/measure to
quantify the difference; Insertion loss, Return Loss, or insertion loss
deviation
GND -----------------
Sig - -
GND -----------------
GND -----------------
SIG - -
SIG - -
GND -----------------
-----Original Message-----
From: Katkoria, Deepak [mailto:Katkoria.Deepak@xxxxxxxxxxx]
Sent: Thursday, August 05, 2010 9:58 AM
To: Haller, Robert; si-list@xxxxxxxxxxxxx
Subject: RE: [SI-LIST] Insertion Loss, Return Loss, ILD, UNi versus Dual
stripline
Yes you would get a loss in both cases..
First option is more preferable...
Otherwise in second option, overlap the differential signal in opposite
polarity. i.e 2 layer +- 3 later -+
Cheers,
Deepak
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Haller, Robert
Sent: Thursday, August 05, 2010 3:49 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Insertion Loss, Return Loss, ILD, UNi versus Dual stripline
I have 2 Diff pairs in the same dielectric Material (ISO370HR). One is Uni
Stripline, One is Dual Stripline. Aside from the potentially different
core/Prepreg material, resin content, glass weave (etc), and they are the Same
Copper Geometry (say 4 mil line/7 mil space) and have the same impedance, same
DC resistance will I be able to observe a difference in Insertion Loss, Return
Loss, or Insertion Loss Deviation ?
GND --------------- GND --------------
Sig - - SIG - -
GND ---------------- SIG - -
GND ---------------
Regards
Bob
Robert Haller
Architect Engineer, Switching
Enterasys Networks
Phone: +1 978 684 1340
Fax: +1 978 684 1499
E-mail: rhaller@xxxxxxxxxxxxx<mailto:gnigg@xxxxxxxxxxxxx>
Web: www.enterasys.com<http://www.enterasys.com/>
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Other related posts:
- » [SI-LIST] AW: Re: Insertion Loss, Return Loss, ILD, UNi versus Dual stripline - Havermann, Gert
