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" <[email protected]>
To: "Said Jackson" <[email protected]>; "Discussion of precise time and
frequency measurement" <[email protected]>
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 <
[email protected]> 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" <[email protected]> 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
>> <[email protected]> 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
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>
>
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