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Measurements >> Phase Noise and Jitter Measurements >> Jitter for serial link.
https://designers-guide.org/forum/YaBB.pl?num=1277784751

Message started by raja.cedt on Jun 28^th, 2010, 9:12pm

Title: Jitter for serial link.
Post by raja.cedt on Jun 28^th, 2010, 9:12pm

hi everyone,

i am not able to correlate the following jitter measurement result for an 6.25gb/s link .

up to my knowledge on jitter TJ=RJ+DJ..where RJ have to be expressed in pk-pk by multiplying with proper factor. Here in the plot also it matching almost. But my Question is
1.DJ is combination of all DDJ,PJ. But how come they are grater than DJ?
2. In the plot for every jitter type they are giving like p-p (means peak to peak), but what abut some delta-delta.

Thanks,
Rajasekhar.

Title: Re: Jitter for serial link.
Post by Mayank on Jun 29^th, 2010, 1:48am

What is DDJ ?

Pls. elaborate the Full forms of these antonyms.

Which kind of Jitter are you referring to as delta-delta ??
Could you how you are calculating delta-delta jitter. People use many terms for Jitter, which grows confusing.

I think PJ is period Jitter. What is PJ composed of - Device Noise ??
If yes, then What is RJ -- Due to Monte-Carlo variations OR Device Noise or Both ??

Also, what tool is this. Seen it for the first time.

Title: Re: Jitter for serial link.
Post by love_analog on Jul 29^th, 2010, 7:29am

Raja
You got it wrong. DDJ is dual dirac jitter.
TJ = 2*Q*RJ + DDJ (not DJ)