[time-nuts] OCXO phase noise

Javier Herrero jherrero at hvsistemas.es
Mon Feb 13 09:10:40 UTC 2012

Hi, Magnus,

El 13/02/2012 09:06, Magnus Danielson escribió:
> On 02/13/2012 08:28 AM, Javier Herrero wrote:
>> Hello all,
>> I'm planning to use in an application this oscillator
>> http://www.abracon.com/Precisiontiming/AOCJY.pdf in the 40MHz version.
>> The phase noise data in the data sheet is for the 10MHz version. Is it
>> possible to "extrapolate" these numbers to what I could expect in the
>> 40MHz version? Any guideline?
> A quick and dirty analysis comes from assuming the same noise but 
> chopped up differently by the frequency, then for original frequency 
> f1 and target frequency f2 you get the scale-factor f2/f1. Similarly, 
> the dB variant becomes 20*log(f2/f1) so for f1=10 MHz and f2=40 MHz 
> you get the scale factor 4 which turns out about 12 dB higher.
> It's not perfect, but gives you a hint of what to expect.

That is exactly my thinking, but I was looking for a second opinion :) 
We have anyway asked Abracon for pn data on the 40MHz version to be sure.

Thanks! Best regards,


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