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From: Joe Gwinn <joegwinn@comcast.net>
Newsgroups: sci.electronics.design
Subject: Re: Interesting reading about spread-spectrum, also for on-board designs
Date: Mon, 24 Jun 2024 16:24:19 -0400
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On Mon, 24 Jun 2024 07:53:56 -0700, john larkin <jl@650pot.com> wrote:

>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.

Typically, yes.

Joe Gwinn