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Measurements >> Phase Noise and Jitter Measurements >> "predicting the phase noise and jitter in PLL
https://designers-guide.org/forum/YaBB.pl?num=1115959289

Message started by layes on May 12^th, 2005, 9:41pm

Title: "predicting the phase noise and jitter in PLL
Post by layes on May 12^th, 2005, 9:41pm

Hi everyone
> I am an eng. of PLL.
> I have read you paper "predicting the phase noise and jitter in PLL"
> Now I am interesting in the jitter of the Pll output . I mean the one
> after the vco buffer for other block using.
> So I measure the Pll output periods after it is stable and
> generate the 'periods.m'
>
> I did not include FD in the vco.
> and the parameters I used are: Fout = 480MHz Fin=12MHz N=40 and M=1
>
> my question are:
> 1.in your matlab code how to choose 'nfft'
> 2.Is that Sphi=L in the matlab generate graph.
> 3.In the curve that matlab generate ,why we choose 100kHz as the delta(f)?
> how should we choose it?
> 4.What is the resolution bandwidth affect our performance?
>
> Hoping for your reply
> Thank your very much
> Qiancheng