Path: ...!weretis.net!feeder8.news.weretis.net!reader5.news.weretis.net!news.solani.org!.POSTED!not-for-mail
From: Jan Panteltje <alien@comet.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Interesting reading about spread-spectrum, also for on-board designs
Date: Sun, 16 Jun 2024 05:26:35 GMT
Message-ID: <v4lt2b$1nfcq$1@solani.org>
References: <v4gsbp$1kg2j$1@solani.org> <45mo6jhcq8kisjmbrom8i1r17ljr6g4qu8@4ax.com> <v4jag5$1ltr7$2@solani.org> <esar6jdro3r7ki70t17jsmpo48qkkg05na@4ax.com>
MIME-Version: 1.0
Content-Type: text/plain; ISO-8859-15
Content-Transfer-Encoding: 8bit
Injection-Date: Sun, 16 Jun 2024 05:26:35 -0000 (UTC)
Injection-Info: solani.org;
	logging-data="1818010"; mail-complaints-to="abuse@news.solani.org"
User-Agent: NewsFleX-1.5.7.5 (Linux-6.2.0-31-generic)
Cancel-Lock: sha1:5liSRyRY/h4ulL2d3T0kzep1Cqo=
X-Newsreader-location: NewsFleX-1.5.7.5 (c) 'LIGHTSPEED' off line news reader for the Linux platform
 NewsFleX homepage: http://www.panteltje.nl/panteltje/newsflex/ and ftp download ftp://sunsite.unc.edu/pub/linux/system/news/readers/ 
X-User-ID: eJwFwYEBwCAIA7CXYECRc7Ta/09YUgEHO1HIUkllprzGWHByqkFaB8x3e86B1E89RaVO36V5h9H+uW/DD0xkFW0=
Bytes: 3614
Lines: 60

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.
I am but a neural net,
Maaz if for those who cannot get the essence and live in an imaginary world.
A bit like a computer game versus reality, packman comes to mind.
:-)