Magnus Danielson wrote: > From: "John Miles" <[EMAIL PROTECTED]> > Subject: Re: [time-nuts] Basic regenerative-divider questions > Date: Fri, 28 Sep 2007 18:51:58 -0700 > Message-ID: <[EMAIL PROTECTED]> > > >> ); SAEximRunCond expanded to false >> Errors-To: [EMAIL PROTECTED] RETRY >> >> >> >>> You can do better than that, a single regenerative divider can be >>> configured to divide by 4. >>> A pair of parallel feedback paths (with amplifiers), one tuned to F/4 >>> and the other to 3F/4 are best. >>> NIST did some work (together with Indian collaborators) on this type of >>> generalised regenerative divider recently. >>> Papers are stored on my Windows machine, will boot it up and locate them. >>> >> Thanks much, Bruce. I suspected either you or Enrico R. would have some >> knowledge of that. >> >> Note that I need to end up with 40 *and* 20 MHz, hence the plan to cascade >> two /2 dividers. If there is a better topology for obtaining both of these >> outputs, it would be good to know. I'd imagine that a /4 divider running >> alongside a /2 divider would be better from the additive-noise perspective. >> >> I will probably end up wanting a 10-MHz output as well. The obvious >> question would be, should that be a separate F/8 + 7F/8 path, or a /2 >> divider following the /4 divider? I haven't seen many references to /8 >> regenerative dividers but I suppose they'd be workable. Availability of >> 8.75 MHz crystals might be what decides that question. >> > > The article in question is... > http://tf.nist.gov/timefreq/general/pdf/1890.pdf > but also > http://tf.nist.gov/timefreq/general/pdf/1800.pdf > > See for yourself. > > Cheers, > Magnus > > > To which you can add Enrico's paper:
http://www.femto-st.fr/~rubiola/journal-articles/rubiola1992im-regenerative-divider-noise.pdf <http://www.femto-st.fr/%7Erubiola/journal-articles/rubiola1992im-regenerative-divider-noise.pdf> Bruce _______________________________________________ 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.
