|
[si-list]
||
[Date Prev]
[06-2007 Date Index]
[Date Next]
||
[Thread Prev]
[06-2007 Thread Index]
[Thread Next]
[SI-LIST] Re: soldering plastic balls
- From: "Lee Ritchey" <leeritchey@xxxxxxxxxxxxx>
- To: "Scott McMorrow" <scott@xxxxxxxxxxxxx>, jose.moreira@xxxxxxxxxx
- Date: Tue, 5 Jun 2007 14:42:58 -0700
We conducted several tests using eye opener vs standard Infiniband cable
and found that the Infiniband cable did just fine by using a small amount
of preemphasis. 5.2 Gb/S over 4 meters of cable.
Lee
> [Original Message]
> From: Scott McMorrow <scott@xxxxxxxxxxxxx>
> To: <jose.moreira@xxxxxxxxxx>
> Cc: <olaney@xxxxxxxx>; <weirsi@xxxxxxxxxx>; <write2larsj@xxxxxxxxx>;
<dan1_st@xxxxxxxxx>; <si-list@xxxxxxxxxxxxx>
> Date: 6/5/2007 2:36:39 PM
> Subject: [SI-LIST] Re: soldering plastic balls
>
> Here's a link for eye opener
>
http://www.gore.com/en_xx/products/cables/copper/networking/gore_eyeopener_t
echnology.html
>
>
> 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
>
>
>
> Moreira, Jose wrote:
> > Orin, Steve
> >
> > On the topic of outer layer conductor for HF equalization, do you know =
> > of any cable assembly manufacturers having already on their portfolio =
> > this type of conductors available for ordering?=20
> >
> > I have read about them but I have not seen this type of conductors
being =
> > used even on application requiring long coaxial cables for high-speed =
> > digital applications. I'm wondering why?
> >
> >
> > Jose
> >
> > -----Original Message-----
> > From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx] =
> > On Behalf Of olaney@xxxxxxxx
> > Sent: Dienstag, 5. Juni 2007 21:10
> > To: weirsi@xxxxxxxxxx
> > Cc: write2larsj@xxxxxxxxx; dan1_st@xxxxxxxxx; si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] Re: soldering plastic balls
> >
> > That's the same theory that works for copperweld coax conductors (copper
> > plated steel). At HF the signal sees only the copper plating, at LF the
> > resistance does not drop as much from the HF value, ...and it's cheaper!
> >
> > Orin
> >
> > On Tue, 05 Jun 2007 11:57:51 -0700 steve weir <weirsi@xxxxxxxxxx> =
> > writes:
> >
> >> Lars, the technique of using only an outer layer conductor for HF=20
> >> equalization is well established. There is a nifty interposer=20
> >> connector=20
> >> technology that uses tiny silver plated nickel balls.
> >> =20
> >> Regards,
> >> =20
> >> =20
> >> Steve.
> >> Lars Juul wrote:
> >>
> >>> Hi Steve,
> >>>
> >>> I'm surprised to hear that the primary objective with the plastic=20
> >>>
> >> core=20
> >>
> >>> balls is to equalize the resistance over frequency, as Sekisui=20
> >>>
> >> write=20
> >>
> >>> on their product page:
> >>>
> >>> ( http://www.sekisui-fc.com/eng/html/jissou/product/jipr_02.html)
> >>> ...
> >>> Micropearl SOL is a solder plated true sphere with a plastic core=20
> >>>
> >> and=20
> >>
> >>> was designed for mounting chips to circuit board. Unlike=20
> >>>
> >> conventional=20
> >>
> >>> solder balls which often cracks under the heat cycle test,
> >>> ...
> >>>
> >>> They go on to show graphs with how much longer these solderjoints=20
> >>>
> >> will=20
> >>
> >>> hold in temp cycle tests comparison to SnAg alloys, which I feel=20
> >>>
> >> is=20
> >>
> >>> very relevant in these RoHS times.
> >>>
> >>> However, it's true that at high frequencies the current flows on=20
> >>>
> >> the=20
> >>
> >>> edge of the conductor (in closest possible proximity to your=20
> >>>
> >> return=20
> >>
> >>> current), and that the lack of conductor diameter will lead to=20
> >>> increased resistance closer to low frequencies, but I doubt that=20
> >>>
> >> it=20
> >>
> >>> will act as a good loss equalizer (I might be wrong, I guess)
> >>>
> >>>
> >>> 2007/6/5, steve weir <weirsi@xxxxxxxxxx=20
> >>>
> >> <mailto:weirsi@xxxxxxxxxx>>:
> >>
> >>> Lars, the idea of the plastic balls is that they have only a=20
> >>>
> >> thin
> >>
> >>> outer
> >>> conducting layer and therefore the resistance remains much=20
> >>>
> >> more
> >>
> >>> uniform
> >>> and therefore equalizing loss across a broad frequency range.
> >>>
> >>> Steve.
> >>> Lars Juul wrote:
> >>> > Hi David,
> >>> > I would call up your packaging vendor and ask them to make a
> >>> test build with
> >>> > ball samples from Sekisui on existing 10 Gbps BGAs, provided=20
> >>>
> >> the
> >>
> >>> ball attach
> >>> > tool is suitable for this. This is usually the stumbling=20
> >>>
> >> block,
> >>
> >>> as this is
> >>> > very expensive in NRE.
> >>> >
> >>> > Alternatively, it's worth exploring if you make a manual=20
> >>>
> >> ball attach
> >>
> >>> > (possible if the packages are for small form factor 10Gbps=20
> >>>
> >> CDRs, for
> >>
> >>> > instance) by printing solder paste on the package lands=20
> >>>
> >> first,
> >>
> >>> and then
> >>> > manually place the balls on the paste by a trained person=20
> >>>
> >> with
> >>
> >>> a steady
> >>> > hand. I assure you, crazier things have been made.
> >>> >
> >>> > On the other hand, my only concern with this kind of balls=20
> >>>
> >> would
> >>
> >>> be the
> >>> > suitability for them in the power supply, as I imagine the
> >>> current carrying
> >>> > capabilities are somewhat limited if you have a plastc core=20
> >>>
> >> on
> >>
> >>> the inside.
> >>> > (I don't think it's possible to attach solid solder and=20
> >>>
> >> plastic
> >>
> >>> balls on
> >>> > specific lands on the package in a high volume setup, yet)
> >>> >
> >>> > PS: you're asking whether they work at 10GHz, which is a=20
> >>>
> >> single
> >>
> >>> frequency
> >>> > point, I think it's feasible to use plastic core balls for a
> >>> narrowband
> >>> > application, but if it's broadband from 0 to 10e9 Hz you're
> >>> driving at, I'd
> >>> > say, try it out in practise first to see if it flies, then=20
> >>>
> >> make
> >>
> >>> a full wave
> >>> > or macromodel of package afterwards to feed the chip I/O=20
> >>>
> >> designers.
> >>
> >>> >
> >>> > Have fun.
> >>> >
> >>> > Best regards,
> >>> > Lars
> >>> >
> >>> > 2007/6/5, david stern <dan1_st@xxxxxxxxx
> >>> <mailto:dan1_st@xxxxxxxxx>>:
> >>> >
> >>> >> hello all
> >>> >>
> >>> >> I was looking for bga soldering balls technology for an
> >>> >> application working at 5GHz to 10GHZ and and found
> >>> >> soldering plastic balls from SEKISUI. Did somebody work=20
> >>>
> >> with
> >>
> >>> them at
> >>> >> 10Ghz?
> >>> >>
> >>> >> Thanks
> >>> >>
> >>> >> David
> >>> >>
> >>> >>
> >>> >> ---------------------------------
> >>> >> Moody friends. Drama queens. Your life? Nope! - their life,
> >>> your story.
> >>> >> Play Sims Stories at Yahoo! Games.
> >>> >>
> >>> >>=20
> >>>
> >> ------------------------------------------------------------------
> >>
> >>> >> To unsubscribe from si-list:
> >>> >> si-list-request@xxxxxxxxxxxxx
> >>> <mailto:si-list-request@xxxxxxxxxxxxx> with 'unsubscribe' in=20
> >>>
> >> the
> >>
> >>> Subject field
> >>> >>
> >>> >> or to administer your membership from a web page, go to:
> >>> >> http://www.freelists.org/webpage/si-list
> >>> >>
> >>> >> For help:
> >>> >> si-list-request@xxxxxxxxxxxxx
> >>> <mailto:si-list-request@xxxxxxxxxxxxx> with 'help' in the=20
> >>>
> >> Subject
> >>
> >>> field
> >>> >>
> >>> >>
> >>> >> List technical documents are available at:
> >>> >> http://www.si-list.net
> >>> >>
> >>> >> List archives are viewable at:
> >>> >> http://www.freelists.org/archives/si-list
> >>> >> or at our remote archives:
> >>> >> =20
> >>>
> >> 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
> >>> <mailto:si-list-request@xxxxxxxxxxxxx> with 'unsubscribe' in=20
> >>>
> >> the
> >>
> >>> Subject field
> >>> >
> >>> > or to administer your membership from a web page, go to:
> >>> > http://www.freelists.org/webpage/si-list
> >>> <http://www.freelists.org/webpage/si-list>
> >>> >
> >>> > For help:
> >>> > si-list-request@xxxxxxxxxxxxx
> >>> <mailto:si-list-request@xxxxxxxxxxxxx> with 'help' in the=20
> >>>
> >> Subject
> >>
> >>> field
> >>> >
> >>> >
> >>> > List technical documents are available at:
> >>> > http://www.si-list.net
> >>> >
> >>> > List archives are viewable at:
> >>> > http://www.freelists.org/archives/si-list
> >>> <http://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=20
> >> field
> >> =20
> >> or to administer your membership from a web page, go to:
> >> http://www.freelists.org/webpage/si-list
> >> =20
> >> For help:
> >> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
> >> =20
> >> =20
> >> List technical documents are available at:
> >> http://www.si-list.net
> >> =20
> >> List archives are viewable at: =20
> >> http://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
> >> =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:
> > http://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
> > http://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:
> > http://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:
> > http://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:
> http://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:
> http://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:
http://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:
http://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
|
|
