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From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: Interesting reading about spread-spectrum, also for on-board designs
Date: Mon, 24 Jun 2024 07:52:36 -0700
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On Mon, 24 Jun 2024 10:35:42 -0400, Joe Gwinn <joegwinn@comcast.net>
wrote:

>On Sun, 16 Jun 2024 07:01:41 -0700, john larkin <jl@650pot.com> wrote:
>
>>On Sun, 16 Jun 2024 05:26:35 GMT, Jan Panteltje <alien@comet.invalid>
>>wrote:
>>
>>>On a sunny day (Sat, 15 Jun 2024 08:43:12 -0700) it happened john larkin
>>><jl@650pot.com> wrote in <esar6jdro3r7ki70t17jsmpo48qkkg05na@4ax.com>:
>>>
>>>>On Sat, 15 Jun 2024 05:57:23 GMT, Jan Panteltje <alien@comet.invalid>
>>>>wrote:
>>>>
>>>>>On a sunny day (Fri, 14 Jun 2024 07:55:14 -0700) it happened john larkin
>>>>><jl@650pot.com> wrote in <45mo6jhcq8kisjmbrom8i1r17ljr6g4qu8@4ax.com>:
>>>>>
>>>>>>On Fri, 14 Jun 2024 07:43:53 GMT, Jan Panteltje <alien@comet.invalid>
>>>>>>wrote:
>>>>>>
>>>>>>>Interesting reading about spread-spectrum, also for on-board designs:
>>>>>>>
>>>>>>>
>>>>>>> https://www.electronicdesign.com/technologies/power/article/55041243/monolithic-power-systems-choosing-the-proper-parameters-in-frequency-spread-spectrum-fss-design
>>>>>>
>>>>>>That's cool, except for the usual dreadful fake pcb image.
>>>>>
>>>>>Fake?
>>>>>Sure some fun zig-zag loops in some tracks... ?
>>>>>Why would anybody bother making artwork like that when you can just take a picture?
>>>>
>>>>I've wondered that. And when they use a picture, it tends to be some
>>>>ancient crufty Dip-package board.
>>>>
>>>>I have rarely used wiggle traces to add delay, but the fake board
>>>>images are full of them. And glowing traces. And vias without holes.
>>>>
>>>>Hey, the electronic designers here could post pics of our prettiest
>>>>real circuit boards.
>>>>
>>>>>
>>>>>
>>>>>>We have a bunch of switchers that use our own FPGAs as the
>>>>>>controllers, and I need to start up a project to make them
>>>>>>spread-spectrum.
>>>>>
>>>>>I find it interesting, not much experience with spread spectrum,
>>>>>but a lot with wideband FM modulation like for the old Ampex video recorders... VHS, Umatic, Betamax too.
>>>>>So with a bit of luck you can send your commercials on a few hundred kHz :-)
>>>>>
>>>>>
>>>>>>We don't want the ss modulation to show up in the DC outputs as ripple
>>>>>>or anything audible.
>>>>>.
>>>
>>>>>RF wideband filtering, inductors.. capacitors...
>>>>>
>>>>
>>>>The jitter pattern needs to create spectral spreading at high
>>>>frequencies but not change averages at low frequencies. There might be
>>>>some math involved.
>>>
>>>Yes I'v heard about maaz
>>>I do not see many tennis players use math to calculate how to move and where to point the ball.
>>>Would take too long.
>>
>>Given the speed of measurable electrical nerve impulses, most sports
>>should be impossible. Recognizing an image, one of millions, in
>>milliseconds is even more improbable.
>>
>>Something else is going on.
>
>In massive parallel:  Fit, extrapolate, intercept.
>
>Joe Gwinn

Even massive parallel has layers of logic, and chemistry is slow.

I suspect that the nerve impulses that we can detect electrically are
not the real story. It is assumed that the pulse timing conveys the
data, which makes no sense.