[time-nuts] Frequency division by 81

[Mark Haun]

On Fri, 19 Jun 2020 14:49:01 +0000
"Poul-Henning Kamp" <phk at phk.freebsd.dk> wrote:
> Gilles Clement writes:
> > Could you point me to a practical design example of a Pi divider ?  
> 
> Look at Fig 2 in Enrico's paper:
> 
> > http://rubiola.org/pdf-articles/conference/2013-ifcs-Frequency-dividers.pdf

I saw this a while ago and found it interesting, but not being a proper
time nut myself, I am wondering: are the advantages of this divider
architecture maintained if you need a square wave output?  Wouldn't the
triangle->square conversion introduce its own noise, possibly swamping
the gains of the lambda divider?

As an aside, I have noticed that every time this question comes up,
there are a variety of answers, ranging from "use a PICDIV" to "use this
fancy low-noise architecture" to "use ECL / HC / modern fast logic
gates."  I read through the replies but never seem to leave the
discussion knowing any more than I did at its start.  It would be great
if someone could provide the context to understand the relative merits
of each suggestion---how they are likely to stack up against one
another and how you would choose one over the others.  I.e. please
spend more time explaining why you are right and everyone else is wrong
;)  Otherwise, it's just chaff.

Mark