[SI-LIST] Re: rms jitter vs p-p jitter

Yes, if he's reffering to a communications system my analysis is at the
grade school level. I figured he was reffering to a digital clock PLL
supplying a clock to various digital circuits. In that case his concern is
also valid because jitter does add to effective skew. I talked to a PLL
engineer at IDT about this at one time but I don't remember if the skew
figure given in the data sheet includes jitter effects.


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Bradley S Henson
Sent: Friday, September 28, 2001 12:09 PM
To: alexh@xxxxxxxxxxxxxxxx
Cc: alexh@xxxxxxxxxxxxxxxx; hata@xxxxxxxxxx; si-list@xxxxxxxxxxxxx;
si-list-bounce@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: rms jitter vs p-p jitter




Depends on the bit_error_rate (BER). The FC Jitter Working group uses :
pk_to_pk= +/- 7 sigma (rms x 14) for 1e-12 BER.

Brad Henson
Raytheon




                    "Alex Horvath"
                    <alexh@agilestorag        To:
<alexh@xxxxxxxxxxxxxxxx>, <hata@xxxxxxxxxx>,
                    e.com>                    <si-list@xxxxxxxxxxxxx>
                    Sent by:                  cc:
                    si-list-bounce@fre        Subject:     [SI-LIST] Re: rms
jitter vs p-p jitter
                    elists.org


                    09/28/2001 11:55
                    AM
                    Please respond to
                    alexh







Ok, RMS is essentially the same as sigma. Three sigma includes 99.8% of all
samples. So you would probably be safe in saying that the peak jitter is 3
times the RMS.

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Alex Horvath
Sent: Friday, September 28, 2001 11:44 AM
To: hata@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: rms jitter vs p-p jitter



For a non-random process peak 1/sqrt2 * VRMS however jitter is a random
process so in theoretical terms the peak jitter value has no meaning. You
have to define it in terms of sigma (assuming it's a normal dist). There
must be some math gurus here that could relate RMS to sigma. Then you can
say something like "the 3 sigma jitter is x ns", 3 sigma including
something
like 98% (I forgot the exact figure) of all jitter samples.

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of hata@xxxxxxxxxx
Sent: Friday, September 28, 2001 4:58 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] rms jitter vs p-p jitter



Dear SI guru,

Appreciate if somebody can shed some light:
If given a rms jitter value, is there any way this can be converted into
peak-peak jitter value?

Thank you.
_____________________________________________________________


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