[time-nuts] Low Phase Noise buffer

John Miles jmiles at pop.net
Fri Feb 19 09:20:19 UTC 2010


I don't see any reason why the broadband noise should affect ADEV readings
outside the measurement bandwidth, any more than short-term stability
characteristics would influence ADEV at longer timescales.  Shouldn't be an
issue.

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of WarrenS
> Sent: Friday, February 19, 2010 1:03 AM
> To: Discussion of precise time and frequency measurement
> Subject: [time-nuts] Low Phase Noise buffer
>
>
>
> T&F Nut question
>
> Is the high frequency phase noise of a buffer important when the
> Oscillator
> is used just as the Reference for taking ADEV data?
> The current (2005) writings say that ADEV phase data should be bandpass
> filtered which removes all the High freq edge jitter.
> If that is the case, Does a buffer's added HIGH FREQUENCY phase noise and
> jitter have any effect on the ADEV numbers when using modern, high
> resolution, mixer type, Time interval counters? Of course the low
> frequency
> type of buffer noise would still be important.
>
> Previously there was some confusion and disagreement on the subject. What
> are the latest opinions?
>
> ws
>
>
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