[time-nuts] Division Circuit

[Tim Shoppa]

Yes! I did find a patent that illustrated the exact same feedback circuit
as in the EE times article. But most self-decoding ring counters in
mass-produced applications use simpler lower propagation-delay gate
arrangements to ensure the counter self-corrects any defective sequences.
e.g. look at how the CD4017 does not use a 10 input NAND gate!!!

Tim N3QE

On Fri, Nov 14, 2014 at 4:39 PM, Said Jackson via time-nuts <
time-nuts at febo.com> wrote:

> The premise of higher than "normal" click speed is false in the article
> too because the complex NOR gate is slow with that many inputs, and its tpd
> needs to be added to the Tsu and Tco of the flip flop chains, as well as
> the pcb propagation delays through the worst case trace..
>
> It would have been faster to simply use a single reset RC delay to reset
> all FF asynchronously while only setting one FF at the same time during
> power-on. That would remove the Nor gate delay from the max speed
> calculation..
>
> Sent From iPhone
>
> > On Nov 14, 2014, at 12:13, "Don Latham" <djl at montana.com> wrote:
> >
> > Thanks. You reminded me of the time when <design ideas> really had
> content. No
> > more, I'm afraid...
> > Don
> >
> > Azelio Boriani
> >> No need to digitize, the article is available here:
> >> <
> http://www.edn.com/design/test-and-measurement/4347165/Circuit-divides-frequency-by-N-1
> >
> >> or here (in .PDF):
> >> ftp://ztchs.p.lodz.pl/PRP/PRP_2006_2007/71102di.pdf
> >>
> >> On Fri, Nov 14, 2014 at 8:02 AM, Perry Sandeen via time-nuts
> >> <time-nuts at febo.com> wrote:
> >>> List,
> >>>
> >>>
> >>>
> >>> I’ve digitized and edited an article titled* Circuit DividesFrequency
> by N+1
> >>> by Bert Erickson, Fayetteville, NY from EDN 7/11/2002*.
> >>>
> >>>
> >>>
> >>> Essentially, this circuit is expandable and allows for adivision by any
> >>> number plus one.
> >>>
> >>>
> >>>
> >>> Anyone who wants a PDF copy please send me an original emailoff list.
> >>>
> >>>
> >>>
> >>> Regards,
> >>>
> >>>
> >>>
> >>> Perrier
> >>>
> >>>
> >>> _______________________________________________
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> >
> >
> > --
> > "The power of accurate observation is commonly called cynicism by those
> who
> > have not got it."
> > -George Bernard Shaw
> >
> > Dr. Don Latham AJ7LL
> > Six Mile Systems LLC
> > 17850 Six Mile Road
> > Huson, MT, 59846
> > mail:  POBox 404
> > Frenchtown MT 59834-0404
> > VOX 406-626-4304
> > Skype: buffler2
> > www.lightningforensics.com
> > www.sixmilesystems.com
> >
> >
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