Discussion:
Interesting reading about spread-spectrum, also for on-board designs
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Jan Panteltje
2024-06-14 07:43:53 UTC
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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
john larkin
2024-06-14 14:55:14 UTC
Permalink
Post by Jan Panteltje
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.
Jan Panteltje
2024-06-15 05:57:23 UTC
Permalink
On a sunny day (Fri, 14 Jun 2024 07:55:14 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
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?
Post by john larkin
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 :-)
Post by john larkin
We don't want the ss modulation to show up in the DC outputs as ripple
or anything audible.
RF wideband filtering, inductors.. capacitors...
john larkin
2024-06-15 15:43:12 UTC
Permalink
Post by Jan Panteltje
On a sunny day (Fri, 14 Jun 2024 07:55:14 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
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.
Post by Jan Panteltje
Post by john larkin
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 :-)
Post by john larkin
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.
Jan Panteltje
2024-06-16 05:26:35 UTC
Permalink
On a sunny day (Sat, 15 Jun 2024 08:43:12 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
On a sunny day (Fri, 14 Jun 2024 07:55:14 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
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.
Post by Jan Panteltje
Post by john larkin
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 :-)
Post by john larkin
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.
I am but a neural net,
Maaz if for those who cannot get the essence and live in an imaginary world.
A bit like a computer game versus reality, packman comes to mind.
:-)
john larkin
2024-06-16 14:01:41 UTC
Permalink
Post by Jan Panteltje
On a sunny day (Sat, 15 Jun 2024 08:43:12 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
On a sunny day (Fri, 14 Jun 2024 07:55:14 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
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.
Post by Jan Panteltje
Post by john larkin
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 :-)
Post by john larkin
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.
Jan Panteltje
2024-06-16 15:13:39 UTC
Permalink
On a sunny day (Sun, 16 Jun 2024 07:01:41 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
On a sunny day (Sat, 15 Jun 2024 08:43:12 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
On a sunny day (Fri, 14 Jun 2024 07:55:14 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
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.
Post by Jan Panteltje
Post by john larkin
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 :-)
Post by john larkin
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.
Much pre-processing is going on in the eye
The neural network model works quite well
Doing the same with electronics is not so easy,
a cubic mm of brain tissue contains a lot of neurons.
Post by john larkin
Something else is going on.
Bio-inspired cameras and AI help drivers detect pedestrians and obstacles faster
https://www.sciencedaily.com/releases/2024/05/240529144230.htm

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