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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