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From: Cursitor Doom <cd999666@notformail.com>
Newsgroups: sci.electronics.design
Subject: Re: another fast one-shot
Date: Wed, 12 Jun 2024 22:18:43 -0000 (UTC)
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On Wed, 12 Jun 2024 11:11:28 -0700, john larkin wrote:

> On Wed, 12 Jun 2024 17:22:49 -0000 (UTC), Cursitor Doom
> <cd999666@notformail.com> wrote:
> 
>>On Wed, 12 Jun 2024 09:33:17 -0700, john larkin wrote:
>>
>>> Here's another idea for a fast one-shot. This is the just-apply-money
>>> version and should get close to 1 ns pulse width and should easily
>>> trigger at 150 MHz.
>>> 
>>> https://www.dropbox.com/scl/fi/1okfo8964bw5m53mjmxs6/
>>Pecl_One_Shot_1.jpg?rlkey=dwus6qjyqsynl2rv6uje2xxtj&raw=1
>>> 
>>> I can use the other half of the dual comparator elsewhere. This one
>>> has programmable hysteresis too.
>>
>>Exposing my contemptworthy ignorance here no doubt, but what exactly is
>>it that is fast about this design, John? And what would its application
>>be?
> 
> It would have a leading-edge prop delay of 350 ps, a minimum pulse width
> just over 1 ns, and would easily trigger at 150 MHz. Integrated
> one-shots, xxx123 types, are always terrible, even the obsolete ECL
> ones.
> 
> It would be a programmable delay in a number of possible products,
> including some optical modulators. Just playing right now.
> 
> More dollars could certainly do something faster, but as long as
> customers connect boxes with cables, faster isn't worth a lot. Light
> just moves too slow.
> 
> Any suggestions for a faster one-shot?

Not from me! I couldn't even design a PID controlled PLL without recourse 
to the 'net.