[time-nuts] Phase noise measurement with a scope

Magnus Danielson magnus at rubidium.dyndns.org
Thu Jun 13 16:26:41 EDT 2013

On 06/13/2013 04:26 PM, Stefan Heinzmann wrote:
> Azelio Boriani wrote:
>> The problem with sampling 'scopes is that you cannot get a continuos
>> samples stream. I think that the TimePod correlates continuously in
>> time.
> Does that matter for phase noise measurements? Doesn't that just make
> the measurement take correspondingly more time?

It matters a lot, since the length of memory will limit the how close in 
you can do it. You can naturally make multiple runs, and that's what the 
TimePod do, but with decimations done in realtime by the firmware.

You can do it with high speed ADCs, but it won't bee cost efficient and 
it will cost you in speed, as you need to do much in software processing 
to get there.

The TimePod is in that context a fairly well balanced design as in bang 
for the buck. Another aspect I like is that it can do pretty neat 
long-term measurements.


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