I've an answer from Abracon. I had overlooked these plots:
http://www.abracon.com/Precisiontiming/AOCJY%20Typ%20Phase%20Noise%20Plots.pdf
The answer is that we can expect for the 40MHz unit a phase noise
performance half way between the 10MHz and 100MHz units performance.
That is, compared with the 10MHz unit, roughly a 20dB increase at 10Hz,
a more or less 12dB increase at 100Hz, 6dB at 1000Hz, and around 3dB
from that point.
Regards,
Javier
El 13/02/2012 16:45, Javier Herrero escribió:
Thanks for your answers, Magnus and John. For now, I will take the
12dB value as a starting point until further confirmation.
Regards,
Javier
El 13/02/2012 10:32, Magnus Danielson escribió:
On 02/13/2012 10:16 AM, John Miles wrote:
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.
Most likely, the PN improvement will be somewhat better than the
expected 12
dB close to the carrier, and somewhat worse than expected (if you
see any
improvement at all) farther out.
The corner frequency that separates "close in" and "farther out"
will be
device-specific, but it'll probably happen between 100 Hz and 2 kHz.
A more proper analysis would separate the effects of oscillator Q,
resonator loop noise and the buffer noise and then scale them
accordingly.
Assuming the same Q (which isn't correct) the oscillator core 1/f^2
or 1/f^3 flips up on. The buffer noise then masks on top of that.
Cheers,
Magnus
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