Re: PCB power planes?

Joel Koltner wrote:
"Joerg" <notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote in message news:Xbtck.1063$zv7.897@xxxxxxxxxxxxxxxxxxxxxxx
That's the crux with DSP, they often can't do that. This is where wave digital filters come in handy but youngsters don't have the foggiest what that is or think it's some tuning device for a surfboard.

They are few -- if any? -- undergraduate EE curriculums that even mention switched cap design... it's pretty much all DSP and lumped-element filters these days.


Shhht! Don't tell. Keeps us busy :-)


I've read the Fettweis paper on WDFs -- I think I posted a copy to ABSE at some point? -- but I've never had a good application for them. I should definitely revisit the topic as I didn't realize the group delay could be so small.


You need to select a processor that can do stuff like fetch, shift and shift-add in very few machine cycles, ideally in one. Should be 16-bit, too, but that's no big deal anymore these days.

AFAICT after Professor Fettweis retired the usual happened. This whole research area became unglued and withered. It's sad, there is hardly any continuance in academia. That's what I like about working in industry, you continue the product lines whether you like it or not. Better for the customers.

--
Regards, Joerg

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