List: time-nuts@lists.febo.com
From: Jürgen Appel
Re: Lowest noise (phase noise and ADEV) method to achieve 10 MHz signal from 5 MHz input
Tue, Nov 30, 2021 3:26 PM
Therefore, I'm considering ways I might
> generate a low-noise 10 MHz signal from the 5 MHz reference.
>
> An obvious way is to use a doubler. However, as I understand it, even an
> ideal doubler will add 20log(2)=6 dB of phase noise to the 10 MHz
> signal.
Yes, this is a fundamental physical property which cannot be avoided.