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 > ------------------------------------------------------- > > > > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > or to administer your membership from a web page, go to: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > > List technical documents are available at: > http://www.si-list.net > > List archives are viewable at: =20 > //www.freelists.org/archives/si-list > or at our remote archives: > http://groups.yahoo.com/group/si-list/messages > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > =20 > > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > or to administer your membership from a web page, go to: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > > List technical documents are available at: > http://www.si-list.net > > List archives are viewable at: > //www.freelists.org/archives/si-list > or at our remote archives: > http://groups.yahoo.com/group/si-list/messages > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > > > ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu