# [time-nuts] Calculating phase jitter from phase noise - appnote by silabs

Bob Camp lists at rtty.us
Fri May 11 16:17:19 UTC 2012

Hi

Be very careful with all these phase noise to jitter conversions. They make
some assumptions about the "noise" that are likely true, but may not be. The
gotcha is that a normal noise measurement does not take phase data. Without
the phase data you really can't properly do the reconstruction. You have to
assume that it's random in the phase domain.

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Azelio Boriani
Sent: Friday, May 11, 2012 11:28 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Calculating phase jitter from phase noise - appnote
by silabs

And one from HP/Agilent (taking into account the "colored noise" too:

http://cp.literature.agilent.com/litweb/pdf/5990-3108EN.pdf

And one from Fordahl, with the random zero cross consideration:

http://www.metatech.com.tw/doc/appnote-fordahl/e-AN-02-3.pdf

On Fri, May 11, 2012 at 4:00 PM, Jim Lux <jimlux at earthlink.net> wrote:

> On 5/11/12 1:51 AM, Attila Kinali wrote:
>
>> Moin,
>>
>> I just stumbled over a nice little summary how to calculate the jitter
>> of a signal from its phase noise plot by silicon labs:
>>
http://www.silabs.com/Support%**20Documents/TechnicalDocs/**AN256.pdf<http:/
/www.silabs.com/Support%20Documents/TechnicalDocs/AN256.pdf>
>>
>>                        Attila Kinali
>>
>>
> and one from Wenzel
>
>
>
>
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