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 15:13:39 GMT Message-ID: References: <45mo6jhcq8kisjmbrom8i1r17ljr6g4qu8@4ax.com> <6rrt6jdnu9q86jc81n3pt3jqli1t42te8f@4ax.com> MIME-Version: 1.0 Content-Type: text/plain; ISO-8859-15 Content-Transfer-Encoding: 8bit Injection-Date: Sun, 16 Jun 2024 15:13:40 -0000 (UTC) Injection-Info: solani.org; logging-data="1839156"; mail-complaints-to="abuse@news.solani.org" User-Agent: NewsFleX-1.5.7.5 (Linux-6.2.0-31-generic) Cancel-Lock: sha1:cuKgqyfLjFRAmzPHUWn+FYyMUVc= 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: eJwFwQkBACAIBLBKIHBIHPn6R3AzAaNcYVBbWw9MS5ocUm5MUvfuFGt5yTN5IXmub/Y0XfJQxHXWeAyy+WFhFWw= Bytes: 4421 Lines: 77 On a sunny day (Sun, 16 Jun 2024 07:01:41 -0700) it happened john larkin wrote in <6rrt6jdnu9q86jc81n3pt3jqli1t42te8f@4ax.com>: >On Sun, 16 Jun 2024 05:26:35 GMT, Jan Panteltje >wrote: > >>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. > >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. Much pre-processing is going on in the eye The neural network model works quite well Doing the same with electronics is not so easy, a cubic mm of brain tissue contains a lot of neurons. >Something else is going on. Bio-inspired cameras and AI help drivers detect pedestrians and obstacles faster https://www.sciencedaily.com/releases/2024/05/240529144230.htm