Path: ...!Xl.tags.giganews.com!local-1.nntp.ord.giganews.com!news.giganews.com.POSTED!not-for-mail NNTP-Posting-Date: Mon, 24 Jun 2024 14:32:50 +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 10:32:50 -0400 Message-ID: <1o0j7jta3sqmtpp0ogu60jpf1lduql59q5@4ax.com> References: <45mo6jhcq8kisjmbrom8i1r17ljr6g4qu8@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: 23 X-Usenet-Provider: http://www.giganews.com X-Trace: sv3-WN8a5oPFC1naGSDC4ktTv9CT1bDwvzprLXYstyfvhwxMdBNhsaDtB4qbObM9BSl3WriUBRjBizpb17F!GSvixnQ/y/nATu0f0l5aDlJhCY5tXO9VIa9iKyzhmEPwyBmJYRuJq92OXJT5A5tZB7pG98I= 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: 1987 On Fri, 14 Jun 2024 07:55:14 -0700, john larkin wrote: >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. > >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. > >We don't want the ss modulation to show up in the DC outputs as ripple >or anything audible. Standard issue in radar systems. Take the FFT of the ss modulation and develop a pseudo-random sequence generator which shows no structure in the spectrum. Joe Gwinn