[SI-LIST] Re: Receiver Jitter Testing

Hi Chris

Basically for each frequency of your sinusoidal injected jitter, you =
increase the amplitude of your injected sinusoidal jitter until you find =
the pass/fail transition. The values can be in absolute injected jitter =
(e.g. picoseconds) or in UI (unit intervals) values which you can =
convert to timing by multiplying the UI values by the data rate period.

Typically you are either able to do a function test at each (injected =
jitter frequency, injected jitter amplitude point) to see if you have a =
pass or a fail (i.e. your CDR is able to find a correct strobing =
position) (by using a Bit Error Rate Tester or an ATE system) or your =
device might have some internal DFT to provide you that information if =
you are testing it using some type of parametric loopback approach (I =
can send you a paper on this type of approach if you are interested).

Jose


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On Behalf Of Chris.McGrath@xxxxxxxx
Sent: Wednesday, April 23, 2008 11:43 PM
To: si-list@xxxxxxxxxxxxx
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=20
for some information on measuring jitter and I'm hoping that you can =
help=20
me out.

I have seen a metric where injected periodic jitter is graphed on the=20
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=20
sensitivity, what is "Jitter[UI]"?=20

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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