[time-nuts] LPRO 101 ADJUSTMENT

Ulrich Bangert df6jb at ulrich-bangert.de
Wed Aug 6 00:46:35 EDT 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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