[time-nuts] Division Circuit

Alan Melia alan.melia at btinternet.com
Fri Nov 14 18:12:22 EST 2014


Isn't the 10i/p gate to do the divide by N+1?? not just to avoid an "all 
zeros switch on" which does not need all 10 stages fed back if all you want 
is an N stage ring counter??
Alan
G3NYK

----- Original Message ----- 
From: "Tim Shoppa" <tshoppa at gmail.com>
To: "Said Jackson" <saidjack at aol.com>; "Discussion of precise time and 
frequency measurement" <time-nuts at febo.com>
Sent: Friday, November 14, 2014 9:53 PM
Subject: Re: [time-nuts] Division Circuit


> 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
>> >>>
>> >>>
>> >>> _______________________________________________
>> >>> time-nuts mailing list -- time-nuts at febo.com
>> >>> To unsubscribe, go to
>> >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> >>> and follow the instructions there.
>> >> _______________________________________________
>> >> time-nuts mailing list -- time-nuts at febo.com
>> >> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> >> and follow the instructions there.
>> >
>> >
>> > --
>> > "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
>> >
>> >
>> > _______________________________________________
>> > time-nuts mailing list -- time-nuts at febo.com
>> > To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> > and follow the instructions there.
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to 
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there. 




More information about the time-nuts mailing list