[SI-LIST] Re: Board-to-board connectors without reference planes?
- From: Scott McMorrow <scott@xxxxxxxxxxxxx>
- To: dmarc-noreply@xxxxxxxxxxxxx
- Date: Wed, 4 Jun 2014 15:53:38 -0400
PCI express uses co-planar ground referencing for the high speed systems.
Ground pins are adjacent to the differential signal pins on each side.
I would hope that QSeven did the same.
Scott McMorrow
Teraspeed(R) Consulting - A XXXXXX company
16 Stormy Brook Rd
Falmouth, ME 04105
(401) 284-1827 Business
http://www.teraspeed.com
More to come ... soon.
On Wed, Jun 4, 2014 at 3:40 PM, ckrich_99@xxxxxxxxx <
dmarc-noreply@xxxxxxxxxxxxx> wrote:
> I know that high-speed signals must be routed with an
> adjacent reference plane so the current loop area is minimal. We're
> always told not to cross plane splits on PCBs
> because this will cause SI/crosstalk and EMI issues.
> However, I'm working with a QSeven module, which plugs into
> an edge connector.
> http://www.qseven-standard.org/
> The QSeven connector supports very
> high-speed differential signals like Ethernet, USB, HDMI, LVDS and several
> single-ended buses. Once the module is
> plugged into a plastic connector, the signals pass through the connector
> into
> gold-plated discrete pins which are soldered to the baseboard. However,
> there's no reference plane for these
> pins (for at least 6mm), and yet it works fine- how?
> I've had the same question about PCI Express
> connectors. They uses only
> differential-pairs so you can argue the diff-pairs use each other as
> "returns"
> if there's no nearby plane. But QSeven
> also has high-speed single-ended signals.
> Thanks+ Regards,Richard
> ------------------------------------------------------------------
> 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
>
>
>
------------------------------------------------------------------
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
Other related posts:
