From: George Rasko (email@example.com)
Date: Thu Dec 07 2000 - 17:21:13 PST
From: George Rasko
Sent: Thursday, December 07, 2000 9:40 AM
Subject: RE: [SI-LIST] : One Differential To Another
I got a few comments back, generally along the lines of what you said:
- differentail impedance is differential impedance = there won't be
if the impedances are same, no matter how that is achieved.
- that being said, common mode signals and noise will be reflected and not
if the common mode impedances are not the same.
- making a differential pair by putting opposite polarity signals on
opposite sides of
a plane probably gives little common mode rejection, since the
environments on the opposite sides of the plane are likely
Thanks for asking,
From: RMELLISON@aol.com [mailto:RMELLISON@aol.com]
Sent: Thursday, December 07, 2000 5:40 AM
To: George Rasko; firstname.lastname@example.org
Subject: Re: [SI-LIST] : One Differential To Another
George, I was wondering if you ever got an answer to your question on the SI
In my opinion, the differential signal fidelity shouldn't be affected by
changing from a coupled pair to an uncoupled pair as long as the
impedance stays constant. The coupled line would be less susceptible to
crosstalk from an aggressor trace, however. A tighter coupled pair would
have better performance in the presence of crosstalk (higher common mode to
differential mode crosstalk ratio) than a lightly coupled pair.
**** To unsubscribe from si-list or si-list-digest: send e-mail to
email@example.com. In the BODY of message put: UNSUBSCRIBE
si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
This archive was generated by hypermail 2b29 : Tue May 08 2001 - 14:30:23 PDT