[time-nuts] GPS: ADEV or MDEV?

[Dr Bruce Griffiths]

Tom Van Baak wrote:
> Also an idea - is there an easy way to artificially increase Vref
> noise, by say 10x, so one could see if that change made any
> measurable change in OCXO output ADEV or phase noise?
>
> /tvb
>   
Tom

Another possibility is to use a low noise instrumentation amplifier with 
a gain of 10.
Connect the noninverting input to Vref, connect the inverting input to a 
low pass filtered (gain = +1) version of Vref and connect the reference 
pin of the instrumentation amplifier to Vref. The output of the 
instrumentation amplifier will be equal to Vref with about 11x the noise 
down to a frequency determined by the low pass filter cutoff frequency.

Bruce