[SI-LIST] 答复: [SI-LIST] Re: 10G Differential routing trace width
- From: "Shao, Peng" <Peng_Shao@xxxxxxxxxx>
- To: "Filion, Marc-Andre" <marc-andre.filion@xxxxxxxxxxxxxx>, steve weir <weirsi@xxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 14 Oct 2011 15:37:15 +0000
For 10Gbps Serdes signal, there is no traditional thumb rules for you make a
quick judgment on the following factors:
1. Coupling Style: Loosely V.S. Tightly, which is better?
2. Skin loss V.S. Dielectric loss, which is dominating?
3. NEXT V.S. FEXT, which is more serious?
These factors does not impact the Serdes signal performance consistently. They
are variant case by case( depends on the trace width, trace roughness, trace
length, PCB materials, cross-section, cross-talk). The designer should use the
EM field simulation tools to make a trade-off.
Hope it is helpful, and you can understand. NO general Golden rule for all case!
Shaopeng
AE Consultant Mentor Graphics Electronic Technology Co., Ltd.
Tel: +86-10 - 5930 4050
Cell: +86-136 1105 7707
Fax: +86-10-6808 0319
E-mail: peng_shao@xxxxxxxxxx
Address: RM1512, CanWay Building, No.66 NanLiShi Lu, Beijing, China 100045
-----邮件原件-----
发件人: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] 代表
steve weir
发送时间: 2011年10月14日 23:06
收件人: si-list@xxxxxxxxxxxxx
主题: [SI-LIST] Re: 10G Differential routing trace width
Wider traces do help the skin loss. Skin gives you some hard to
equalize out ISI issues. 6 mils isn't great, but it isn't terrible and
15 inches isn't too long. 8 mils is generally a good compromise trace
width. At 10Gbps, dielectric loss is greater than skin loss.
Steve
Steve.
On 10/14/2011 7:52 AM, Filion, Marc-Andre wrote:
> Hi,
> I've got an easy Friday question. When it's time to design board with
> multi-gigabit (> 5Gb) differential signal, we always get lost into a
> discussion with CAD guys. We want more trace width to reduce loss and they
> want more real-estate to fit everything. In that case, increasing dielectric
> thickness is not an option because it will ruin the rest of the layer
> trace-2-trace clearance. In the end, we're stuck with a 6 mils trace that
> will handle a 10G signal. We know, from previous design, that it's working,
> but I'm not sure if this is good practice. We have to go into 10 ~ 15 inch of
> routing with interconnect.
>
>
>
> Is there a rule of thumbs about trace width and signal speed?
>
> When Skin effect become a problematic issue?
>
>
>
> Many thanks,
>
>
>
> Marc-André Filion
>
>
>
>
> ------------------------------------------------------------------
> 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
>
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
>
--
Steve Weir
IPBLOX, LLC
150 N. Center St. #211
Reno, NV 89501
www.ipblox.com
(775) 299-4236 Business
(866) 675-4630 Toll-free
(707) 780-1951 Fax
------------------------------------------------------------------
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
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 technical documents are available at:
http://www.si-list.net
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:
- » [SI-LIST] 答复: [SI-LIST] Re: 10G Differential routing trace width - Shao, Peng
