Path: ...!local-4.nntp.ord.giganews.com!Xl.tags.giganews.com!local-2.nntp.ord.giganews.com!news.giganews.com.POSTED!not-for-mail NNTP-Posting-Date: Mon, 24 Jun 2024 14:35:43 +0000 From: Joe Gwinn Newsgroups: sci.electronics.design Subject: Re: Interesting reading about spread-spectrum, also for on-board designs Date: Mon, 24 Jun 2024 10:35:42 -0400 Message-ID: References: <45mo6jhcq8kisjmbrom8i1r17ljr6g4qu8@4ax.com> <6rrt6jdnu9q86jc81n3pt3jqli1t42te8f@4ax.com> User-Agent: ForteAgent/8.00.32.1272 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 72 X-Usenet-Provider: http://www.giganews.com X-Trace: sv3-SOnBPn+mLLon29Te4x3nUwFdw8DpQ/5uVAyZpTJWAPfg+ibbsB5ix9enToqqXzBlA1CcJ+uX6vpaRxr!thEjk0/+AoiPlMUJQKl2glxLIQZdE1oYJHzTtb/NCS6wWTZKIHjYAgAr0A9bLo3nbDvrGfw= X-Complaints-To: abuse@giganews.com X-DMCA-Notifications: http://www.giganews.com/info/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 4002 On Sun, 16 Jun 2024 07:01:41 -0700, john larkin wrote: >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. > >Something else is going on. In massive parallel: Fit, extrapolate, intercept. Joe Gwinn