• Interesting reading about spread-spectrum, also for on-board designs

    From Jan Panteltje@21:1/5 to All on Fri Jun 14 07:43:53 2024
    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From john larkin@21:1/5 to All on Fri Jun 14 07:55:14 2024
    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.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Jan Panteltje@21:1/5 to jl@650pot.com on Sat Jun 15 05:57:23 2024
    On a sunny day (Fri, 14 Jun 2024 07:55:14 -0700) it happened john larkin <jl@650pot.com> wrote in <45mo6jhcq8kisjmbrom8i1r17ljr6g4qu8@4ax.com>:

    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.

    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?


    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 :-)


    We don't want the ss modulation to show up in the DC outputs as ripple
    or anything audible.

    RF wideband filtering, inductors.. capacitors...

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From john larkin@21:1/5 to All on Sat Jun 15 08:43:12 2024
    On Sat, 15 Jun 2024 05:57:23 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    On a sunny day (Fri, 14 Jun 2024 07:55:14 -0700) it happened john larkin ><jl@650pot.com> wrote in <45mo6jhcq8kisjmbrom8i1r17ljr6g4qu8@4ax.com>:

    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.

    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.



    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 :-)


    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.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Jan Panteltje@21:1/5 to jl@650pot.com on Sun Jun 16 05:26:35 2024
    On a sunny day (Sat, 15 Jun 2024 08:43:12 -0700) it happened john larkin <jl@650pot.com> wrote in <esar6jdro3r7ki70t17jsmpo48qkkg05na@4ax.com>:

    On Sat, 15 Jun 2024 05:57:23 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    On a sunny day (Fri, 14 Jun 2024 07:55:14 -0700) it happened john larkin >><jl@650pot.com> wrote in <45mo6jhcq8kisjmbrom8i1r17ljr6g4qu8@4ax.com>:

    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.

    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.



    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 :-) >>

    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.
    :-)

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  • From john larkin@21:1/5 to All on Sun Jun 16 07:01:41 2024
    On Sun, 16 Jun 2024 05:26:35 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    On a sunny day (Sat, 15 Jun 2024 08:43:12 -0700) it happened john larkin ><jl@650pot.com> wrote in <esar6jdro3r7ki70t17jsmpo48qkkg05na@4ax.com>:

    On Sat, 15 Jun 2024 05:57:23 GMT, Jan Panteltje <alien@comet.invalid> >>wrote:

    On a sunny day (Fri, 14 Jun 2024 07:55:14 -0700) it happened john larkin >>><jl@650pot.com> wrote in <45mo6jhcq8kisjmbrom8i1r17ljr6g4qu8@4ax.com>:

    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.

    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.



    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 :-) >>>

    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.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Jan Panteltje@21:1/5 to jl@650pot.com on Sun Jun 16 15:13:39 2024
    On a sunny day (Sun, 16 Jun 2024 07:01:41 -0700) it happened john larkin <jl@650pot.com> wrote in <6rrt6jdnu9q86jc81n3pt3jqli1t42te8f@4ax.com>:

    On Sun, 16 Jun 2024 05:26:35 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    On a sunny day (Sat, 15 Jun 2024 08:43:12 -0700) it happened john larkin >><jl@650pot.com> wrote in <esar6jdro3r7ki70t17jsmpo48qkkg05na@4ax.com>:

    On Sat, 15 Jun 2024 05:57:23 GMT, Jan Panteltje <alien@comet.invalid> >>>wrote:

    On a sunny day (Fri, 14 Jun 2024 07:55:14 -0700) it happened john larkin >>>><jl@650pot.com> wrote in <45mo6jhcq8kisjmbrom8i1r17ljr6g4qu8@4ax.com>:

    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.

    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.



    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 :-)


    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.

    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

    --- SoupGate-Win32 v1.05
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  • From Joe Gwinn@21:1/5 to john larkin on Mon Jun 24 10:32:50 2024
    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Joe Gwinn@21:1/5 to john larkin on Mon Jun 24 10:35:42 2024
    On Sun, 16 Jun 2024 07:01:41 -0700, john larkin <jl@650pot.com> wrote:

    On Sun, 16 Jun 2024 05:26:35 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    On a sunny day (Sat, 15 Jun 2024 08:43:12 -0700) it happened john larkin >><jl@650pot.com> wrote in <esar6jdro3r7ki70t17jsmpo48qkkg05na@4ax.com>:

    On Sat, 15 Jun 2024 05:57:23 GMT, Jan Panteltje <alien@comet.invalid> >>>wrote:

    On a sunny day (Fri, 14 Jun 2024 07:55:14 -0700) it happened john larkin >>>><jl@650pot.com> wrote in <45mo6jhcq8kisjmbrom8i1r17ljr6g4qu8@4ax.com>:

    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.

    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.



    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 :-)


    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.

    In massive parallel: Fit, extrapolate, intercept.

    Joe Gwinn

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From john larkin@21:1/5 to All on Mon Jun 24 07:53:56 2024
    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.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From john larkin@21:1/5 to All on Mon Jun 24 07:52:36 2024
    On Mon, 24 Jun 2024 10:35:42 -0400, Joe Gwinn <joegwinn@comcast.net>
    wrote:

    On Sun, 16 Jun 2024 07:01:41 -0700, john larkin <jl@650pot.com> wrote:

    On Sun, 16 Jun 2024 05:26:35 GMT, Jan Panteltje <alien@comet.invalid> >>wrote:

    On a sunny day (Sat, 15 Jun 2024 08:43:12 -0700) it happened john larkin >>><jl@650pot.com> wrote in <esar6jdro3r7ki70t17jsmpo48qkkg05na@4ax.com>:

    On Sat, 15 Jun 2024 05:57:23 GMT, Jan Panteltje <alien@comet.invalid> >>>>wrote:

    On a sunny day (Fri, 14 Jun 2024 07:55:14 -0700) it happened john larkin >>>>><jl@650pot.com> wrote in <45mo6jhcq8kisjmbrom8i1r17ljr6g4qu8@4ax.com>: >>>>>
    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.

    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.



    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 :-)


    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.

    In massive parallel: Fit, extrapolate, intercept.

    Joe Gwinn

    Even massive parallel has layers of logic, and chemistry is slow.

    I suspect that the nerve impulses that we can detect electrically are
    not the real story. It is assumed that the pulse timing conveys the
    data, which makes no sense.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Joe Gwinn@21:1/5 to john larkin on Mon Jun 24 16:24:19 2024
    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Joe Gwinn@21:1/5 to john larkin on Mon Jun 24 16:34:30 2024
    On Mon, 24 Jun 2024 07:52:36 -0700, john larkin <jl@650pot.com> wrote:

    On Mon, 24 Jun 2024 10:35:42 -0400, Joe Gwinn <joegwinn@comcast.net>
    wrote:

    On Sun, 16 Jun 2024 07:01:41 -0700, john larkin <jl@650pot.com> wrote:

    On Sun, 16 Jun 2024 05:26:35 GMT, Jan Panteltje <alien@comet.invalid> >>>wrote:

    On a sunny day (Sat, 15 Jun 2024 08:43:12 -0700) it happened john larkin >>>><jl@650pot.com> wrote in <esar6jdro3r7ki70t17jsmpo48qkkg05na@4ax.com>:

    On Sat, 15 Jun 2024 05:57:23 GMT, Jan Panteltje <alien@comet.invalid> >>>>>wrote:

    On a sunny day (Fri, 14 Jun 2024 07:55:14 -0700) it happened john larkin >>>>>><jl@650pot.com> wrote in <45mo6jhcq8kisjmbrom8i1r17ljr6g4qu8@4ax.com>: >>>>>>
    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.

    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.



    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 :-)


    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.

    In massive parallel: Fit, extrapolate, intercept.

    Joe Gwinn

    Even massive parallel has layers of logic, and chemistry is slow.

    True, but it doesn't work like a digital computer.


    I suspect that the nerve impulses that we can detect electrically are
    not the real story. It is assumed that the pulse timing conveys the
    data, which makes no sense.

    Yes and no.

    In the visual system, the key is a bunch of 2D "images" or maps, where
    items of interest and their location are coded as activity peaks.
    There are related maps where things like audio spectra are spread out
    into a 2D may that is not an image. Neurocomputing is a very large
    area, and filled with known-incomplete models that we don't yet know
    how to improve.

    Pulse timing matters in some places, but not in others (where pulse
    rate is what matters. This for longer nerves; within much of the
    brain, it's action potentials that are communicated without pulses.
    And then there are various kinds of chemical messenger, some fast,
    some very slow ...

    Joe Gwinn

    --- SoupGate-Win32 v1.05
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