Path: ...!weretis.net!feeder8.news.weretis.net!reader5.news.weretis.net!news.solani.org!.POSTED!not-for-mail From: Jan Panteltje 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: References: <45mo6jhcq8kisjmbrom8i1r17ljr6g4qu8@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 wrote in : >On Sat, 15 Jun 2024 05:57:23 GMT, Jan Panteltje >wrote: > >>On a sunny day (Fri, 14 Jun 2024 07:55:14 -0700) it happened john larkin >> wrote in <45mo6jhcq8kisjmbrom8i1r17ljr6g4qu8@4ax.com>: >> >>>On Fri, 14 Jun 2024 07:43:53 GMT, Jan Panteltje >>>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. :-)