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: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] 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 > > > [EMAIL PROTECTED] 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 > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-> bin/mailman/listinfo/time-nuts > and > follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
