Jürgen Appel <j...@dfm.dk> writes: > Yes, this is a fundamental physical property which cannot be avoided. > > You can see it that way: If there is a given fluctuating time delay in your > otherwise perfect 5 MHz signal, the amount of phase shift this time > fluctuation corresponds to in a 10 MHz signal is simply twice as big as in > the > 5 MHz signal, simply because the phase evolves twice as fast at 10 MHz. > > This factor of two makes up the 6dB in noise power. > > If you divide the 6 dB noisier 10 MHz signal down again, (neglecting > additional technical noise), you get the original performance of your 5 MHz > signal back.
Doesn't this assume that you inherit all the noise of the reference? For example, the short-term stability of a GPS 1PPS signal is poor, but you can still use it to discipline a VCO with much better short-term stability and retain most of the short-term stability of the VCO. Matt _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
