[SI-LIST] Re: what is quiet line noise
- From: Gregory R Edlund <gedlund@xxxxxxxxxx>
- To: dongsoon72.lim@xxxxxxxxxxx
- Date: Wed, 19 Jan 2005 07:54:20 -0600
Dear Lim,
The quiet line is a traditional way to quantify the crosstalk in mV on a
signal (called the victim) caused by one or more sources (called
aggressors) switching nearby. If you have good control over the patterns
you send across a bus, you can probe the quiet line noise by causing only
the aggressors to switch in the same direction at the same time while
sending a long string of zeros or ones on every other bit.
It used to be we were interested in making sure that crosstalk didn't get
large enough to switch a bit that was supposed to be static - hence the
name quiet line noise. On multi-gigabit interfaces we are more interested
in knowing how much crosstalk causes the victim eye pattern to close in ps
and in mV, but the quiet line remains a good way to quantify how strong
the crosstalk is. Of course, you can do this experiment in simulation,
too.
If you do the same experiment allowing all bits to switch in the same
direction at the same time EXCEPT the victim, you will be measuring the
effects of crosstalk AND voltage disturbance on the power distribution
system caused by so many drivers all demanding electrons at the same time.
Greg Edlund
Senior Engineer
Signal Integrity
IBM Engineering and Technology Services
3605 Hwy. 52 N, Dept. HDC
Rochester, MN 55901
gedlund@xxxxxxxxxx
Msg: #2 in digest
Date: Tue, 18 Jan 2005 23:48:24 +0000 (GMT)
From: =?euc-kr?B?wNO1v7z4?= <dongsoon72.lim@xxxxxxxxxxx>
Subject: [SI-LIST] what is quiet line noise
Hi Experts/
Anyone know of Quiet line noise ?
Thanks in advance
Regards,
Lim
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