[SI-LIST] Re: Receiver Jitter Testing

You can also use a protocol analyzer to see when the receiver under test 
"gives up" on the link
and starts transmitting training patterns back on the other link direction.

-Paul


----- Original Message ----- 
From: "Moreira, Jose" <jose.moreira@xxxxxxxxxx>
To: <Chris.McGrath@xxxxxxxx>; <si-list@xxxxxxxxxxxxx>
Sent: Wednesday, April 23, 2008 9:07 PM
Subject: [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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