Gilles, if I read the Calosso-Rubiola paper correctly a Pi divider is pretty much your standard square-wave producing digital divider, such as a 74163 (for even divides). There's odd-value (3,5,7) Pi dividers shown at https://www.theremin.us/Circuit_Library/symmetrical_digital_dividers.html. What the Calosso-Rubiola paper promotes is the Lambda divider, which is depicted in figure 2 of the paper.
Bob L. > Sent: Friday, June 19, 2020 at 10:27 AM > From: "Gilles Clement" <clemg...@gmail.com> > To: "Poul-Henning Kamp" <p...@phk.freebsd.dk> > Cc: "Discussion of precise time and frequency measurement" > <time-nuts@lists.febo.com> > Subject: Re: [time-nuts] Frequency division by 81 > > Hi, > Could you point me to a practical design example of a Pi divider ? > > > Envoyé de mon iPad > > > Le 19 juin 2020 à 08:56, Poul-Henning Kamp <p...@phk.freebsd.dk> a écrit : > > > > -------- > > > >> I need to divide the output of an OCXO by a factor D=81 for testing > >> purposes. So with minimum added phase noise. > > > > Two stages of divide by 9 PI-dividers ? > > > > > > http://rubiola.org/pdf-articles/conference/2013-ifcs-Frequency-dividers.pdf > > > > -- > > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > > p...@freebsd.org | TCP/IP since RFC 956 > > FreeBSD committer | BSD since 4.3-tahoe > > Never attribute to malice what can adequately be explained by incompetence. > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
