[SI-LIST] Re: DDR Vref Bypassing
- From: steve weir <weirsi@xxxxxxxxxx>
- To: crjohnson11@xxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Mon, 18 Jul 2005 18:04:52 -0700
Chris,
It depends on a couple of factors. If you are going to bypass to both
rails, it is hard to do better than X2Ys.
If your image returns are only GND as is a good idea, then bypassing the
reference to that plane takes care f the cavity issues.
Steve
At 01:48 PM 7/18/2005 -0400, Christopher R. Johnson wrote:
>I have seen references that have Vref bypass capacitors to both VDD and
>GND. Other references have capacitors only to GND. Is it really
>necessary to have "balanced" capacitors on the Vref lines? Why? If the
>"balanced" design is desirable, would an X2Y capacitor be a good choice,
>since it is "2 capacitors in one"?
>
>Regards,
>
>Chris Johnson
>------------------------------------------------------------------
>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 FAQ wiki page is located at:
> http://si-list.org/wiki/wiki.pl?Si-List_FAQ
>
>List technical documents are available at:
> http://www.si-list.org
>
>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
>
------------------------------------------------------------------
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 FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
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:
