[time-nuts] Frequency division by 81

[Robert LaJeunesse]

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" <clemgill at gmail.com>
> To: "Poul-Henning Kamp" <phk at phk.freebsd.dk>
> Cc: "Discussion of precise time and frequency measurement" <time-nuts at 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 <phk at 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
> > phk at 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.
> 
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