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NNTP-Posting-Date: Mon, 24 Jun 2024 14:53:56 +0000
From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: Interesting reading about spread-spectrum, also for on-board designs
Date: Mon, 24 Jun 2024 07:53:56 -0700
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On Mon, 24 Jun 2024 10:32:50 -0400, Joe Gwinn <joegwinn@comcast.net>
wrote:

>On Fri, 14 Jun 2024 07:55:14 -0700, john larkin <jl@650pot.com> wrote:
>
>>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.
>>
>>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

And has minimal low-frequency content.