[time-nuts] Code for phase noise and allan variance

[Matt Ettus]

Does anyone have code which will take an amplitude vs. time input
stream and output phase noise and/or allan variance?

Thanks,
Matt

P.S.  I was forwarded a message from the list about the USRP.  The
USRP does have an input for an external clock source, so feel free to
feed it from your Hydrogen Maser or whatever else you have laying
around :)

The reference needs to be at 64 MHz or lower.  You ADC sample rate can
be 1/4*fref, 1/2*fref, fref, or 2*fref, as long as the final rate is
<= 64 MHz.

The DAC sample rate will always be 2*fref.

Matt