[SI-LIST] Re: Question about Broadcom's PHY differential pairs termination
- From: steve weir <weirsi@xxxxxxxxxx>
- To: jasonleehan@xxxxxxxxx
- Date: Sun, 29 Jul 2007 13:03:12 -0700
Han, the driver is source terminated w/ the termination resistors. They
need to be as close to the driver as possible.
Steve.
Han Li wrote:
> Hi, experts,
> I'am designing with Broadcom PHY BCM5461s, I have a question about
> this phy's differential pairs termination.At Twisted pairs interface
> side(interface between PHY and Transformer),ASIC's Datasheet and Application
> note says "place differential pair termination resisters near PHY side as
> close as possible"
> It seems clear that we put differential paris termination neart the
> end of receiver(Rx direction), this method is also recommended by Dr. Howard
> Johnson in his book"High-Speed Digital Design-a handbook of black magic "
> pp-244,
> But why put termination also near driver side?(Tx direction) ,
> Could any one provide a deeper explanation? Thanks a lot!
> PS: A picture is inside illustrating a reference termination.
>
>
>
> -- Binary/unsupported file stripped by Ecartis --
> -- Type: image/jpeg
> -- File: termination.JPG
>
>
> ------------------------------------------------------------------
> 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 technical documents are available at:
> http://www.si-list.net
>
> 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
>
>
>
>
>
--
Steve Weir
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
California office
(408) 884-3985 Business
(707) 780-1951 Fax
Main office
(401) 284-1827 Business
(401) 284-1840 Fax
Oregon office
(503) 430-1065 Business
(503) 430-1285 Fax
http://www.teraspeed.com
This e-mail contains proprietary and confidential intellectual property of
Teraspeed Consulting Group LLC
------------------------------------------------------------------------------------------------------
Teraspeed(R) is the registered service mark of Teraspeed Consulting Group LLC
------------------------------------------------------------------
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 technical documents are available at:
http://www.si-list.net
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:
