[SI-LIST] Re: Receiver Jitter Testing

Hello Chirs,
Sounds like you are doing Jitter Tolerance compliance.  UI is unit interval 
normalized to your input bit rate.  For example, PCIE gen 2.0 this would have a 
receiver bit rate of 200ps per UI.  At low sinusoidal input jitter frequencies 
your CDR will track large amounts of jitter, as the sinusoidal jitter frequency 
increases you will notice a sharp fall off of this tracking ability.
-Jory

----- Original Message ----
From: "Chris.McGrath@xxxxxxxx" <Chris.McGrath@xxxxxxxx>
To: si-list@xxxxxxxxxxxxx
Sent: Wednesday, April 23, 2008 4:43:09 PM
Subject: [SI-LIST] Receiver Jitter Testing

Hey Gang,
It has been a while since I have been active on the list, but I'm looking 
for some information on measuring jitter and I'm hoping that you can help 
me out.

I have seen a metric where injected periodic jitter is graphed on the 
x-axis of a graph with the y-axis being "Jitter[UI]".  The x-axis is the 
sweep of periodic sinusoidal jitter, but in terms of receiver jitter 
sensitivity, what is "Jitter[UI]"? 

Since it is on the y-axis of the graph, it must be something that we can 
turn up until we indicate a failure in our system.

Thanks,
Chris


-------------------------------------------------------
Chris McGrath
Applications Engineer
chris.mcgrath@xxxxxxxx
480.704.7061
www.smsc.com
-------------------------------------------------------



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