[SI-LIST] Relevance of Common Mode Return Loss
- From: "Randy May" <randy.may@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 8 May 2008 14:27:11 -0400
Greetings,
I've been trying to understand the relevance of common mode return loss in
high speed specifications. I thought that most differential receivers would
reject common mode noise on a link, and amplify the differential, making the
differential spec far more important. An example spec is PCI Express Gen2
which calls for <= -6db from 50MHz to 2.5GHz. What is the impact if I
violate the common mode return loss spec? What is the benefit to me beating
it?
I've also noticed that some spec's have a common mode return loss
requirement on the receiver and not on the transmitter. Any thoughts on why
this might have been done?
Thanks
------------------------------------------------------------------
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:
