a question about period jitter and absolute jitter

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Fractional-N

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it is said that "If the reference is jitter free, then the jitter between the reference and the output of the delay line will just be the period jitter."

can anyone explain to me why?
thanks
 

Since we are not on the Planet Zoltar, where signal sources are available that are "jitter free", I do not know what that statement means!
 

I believe you can think of the delay line as a series of buffers with no memory (i.e. loops), therefore jitter affects only the length of each period.
 

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