[time-nuts] LPRO 101 ADJUSTMENT
Ulrich Bangert
df6jb at ulrich-bangert.de
Wed Aug 6 04:46:35 UTC 2008
Jim,
> A 48-bit-accumulator DDS chip such as the Analog Devices AD9852 will
> achieve such frequency resolution: 2^-48= 3.6*10^-15, call
> it 10^-14. The issue with a DDS is handling the various spurs.
To be even more precise: It achieves this resolution in terms of the
CLOCK frequency and not in terms of the OUTPUT frequency which may be
consirable less resolution.
Best regards
Ulrich Bangert
> -----Ursprungliche Nachricht-----
> Von: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Joseph M Gwinn
> Gesendet: Dienstag, 5. August 2008 16:53
> An: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] LPRO 101 ADJUSTMENT
>
>
> time-nuts-bounces at febo.com wrote on 08/02/2008 04:38:14 PM:
>
> >
> [snip]
> >
> > It would be nice to find a relatively simple and
> inexpensive 10MHz
> > synthesizer that has a resolution of closer to 1E-14 to
> avoid messing
> > with the EFC at all.
>
> A 48-bit-accumulator DDS chip such as the Analog Devices AD9852 will
> achieve such frequency resolution: 2^-48= 3.6*10^-15, call
> it 10^-14. The
> issue with a DDS is handling the various spurs.
>
> Arbitrary function generators such as the Agilent 34220A-001
> (the -001
> option means that an external 10 MHz reference signal is
> accepted) will
> also do the job, in a nice albeit expensive ($2.4K new) package.
>
> Joe Gwinn
>
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