Switching power supply ground plane cuts (again)

[John Popelish]

Then there's Agoston Agoston's sampling head patent, where a trench is
milled into a solid metal block, and the trench itself is a 3D
slotline connecting a SRD impulse generator to two channels of
traveling-wave diode samplers.

Got it around here somewhere. Sure looks like a dead short to me.
Slotlines just defy my intuition somehow.

Hmmm... Anti wires.

 

[Rich Grise]

Hmmm... Anti wires.

To me, it sounds kinda like a 3-sided waveguide, unless these signals
are going across it, in which case never mind.

Cheers!
Rich

 

[John Larkin]

Yet the cult lives on.

John

I have been asked to do a long term consulting contract at $WeDoAvionics
to teach the engineers how to Do It Right [tm]. The separate plane
concept has so many advocates who don't know shit about actually doing a
successful high speed board.

Cheers

PeteS

At this moment, Joerg is rounding up his crew of vicious henchmen to
silence you. They use duct tape, I think.

John

 

[Charlie Edmondson]

That's not advocating separate analog and digital ground planes, though.
I've seen (in the last month alone) 5 designs done that way that have
horrible problems because of plane differentials, that I am now being
asked to fix without re-laying the boards out (I'm doing the consulting
after the fact). Ugh.


Yet the cult lives on.

John

I have been asked to do a long term consulting contract at $WeDoAvionics
to teach the engineers how to Do It Right [tm]. The separate plane
concept has so many advocates who don't know shit about actually doing a
successful high speed board.

Cheers

PeteS

At this moment, Joerg is rounding up his crew of vicious henchmen to
silence you. They use duct tape, I think.

John

No, Joerge doesn't do avionics, mainly medical electronics. Sounds more
like your crew should 'silence' him...

Charlie

 

[PeteS]

Yet the cult lives on.

John

I have been asked to do a long term consulting contract at $WeDoAvionics
to teach the engineers how to Do It Right [tm]. The separate plane
concept has so many advocates who don't know shit about actually doing a
successful high speed board.

Cheers

PeteS

 

[PeteS]

And it bringeth us bread and butter :-D

You are so right

Cheers

PeteS

 

[Joerg]

John Larkin wrote:

That's not advocating separate analog and digital ground planes,
though. I've seen (in the last month alone) 5 designs done that way
that have horrible problems because of plane differentials, that I
am now being asked to fix without re-laying the boards out (I'm
doing the consulting after the fact). Ugh.


Yet the cult lives on.

John


I have been asked to do a long term consulting contract at
$WeDoAvionics to teach the engineers how to Do It Right [tm]. The
separate plane concept has so many advocates who don't know shit
about actually doing a successful high speed board.

Cheers

PeteS

At this moment, Joerg is rounding up his crew of vicious henchmen to
silence you. They use duct tape, I think.
John

No, Joerge doesn't do avionics, mainly medical electronics. Sounds more
like your crew should 'silence' him...

The last av project was quite a while ago but I'd really like to know
where those split ground systems were installed. So I could make sure
not to fly with those aircraft, at least not through thunderstorm zones.
Especially in these days of glass cockpits a brief bright lighting up of
the instrument panel followed by total darkness could become slightly
inconvenient.

 

[Joerg]

John Larkin wrote:

John Larkin wrote:

That's not advocating separate analog and digital ground planes,
though. I've seen (in the last month alone) 5 designs done that
way that have horrible problems because of plane differentials,
that I am now being asked to fix without re-laying the boards out
(I'm doing the consulting after the fact). Ugh.


Yet the cult lives on.

John


I have been asked to do a long term consulting contract at
$WeDoAvionics to teach the engineers how to Do It Right [tm]. The
separate plane concept has so many advocates who don't know shit
about actually doing a successful high speed board.

Cheers

PeteS





At this moment, Joerg is rounding up his crew of vicious henchmen to
silence you. They use duct tape, I think.
John


No, Joerge doesn't do avionics, mainly medical electronics. Sounds
more like your crew should 'silence' him...

The last av project was quite a while ago but I'd really like to know
where those split ground systems were installed. So I could make sure
not to fly with those aircraft, at least not through thunderstorm
zones. Especially in these days of glass cockpits a brief bright
lighting up of the instrument panel followed by total darkness could
become slightly inconvenient.

Joerg!

I can not reveal that, but rest assured it will not exist on certain
newer aircraft

Understandable.


Seriously - in some instances (particularly low speed highly sensitive
systems) a split ground plane can actually be a good thing, but in a
mixed signal system it's asking for trouble.

Yes, but those troubles bring food onto the table at our house ;-)

FWIW, the issues are currently on military aircraft - but it seems the
opposition aircraftd are worse than ours

Ok, I am too old for service now so I guess I'll be safe then ....

 

[PeteS]

John Larkin wrote:

That's not advocating separate analog and digital ground planes,
though. I've seen (in the last month alone) 5 designs done that
way that have horrible problems because of plane differentials,
that I am now being asked to fix without re-laying the boards out
(I'm doing the consulting after the fact). Ugh.


Yet the cult lives on.

John


I have been asked to do a long term consulting contract at
$WeDoAvionics to teach the engineers how to Do It Right [tm]. The
separate plane concept has so many advocates who don't know shit
about actually doing a successful high speed board.

Cheers

PeteS




At this moment, Joerg is rounding up his crew of vicious henchmen to
silence you. They use duct tape, I think.
John

No, Joerge doesn't do avionics, mainly medical electronics. Sounds
more like your crew should 'silence' him...

The last av project was quite a while ago but I'd really like to know
where those split ground systems were installed. So I could make sure
not to fly with those aircraft, at least not through thunderstorm zones.
Especially in these days of glass cockpits a brief bright lighting up of
the instrument panel followed by total darkness could become slightly
inconvenient.

Joerg!

I can not reveal that, but rest assured it will not exist on certain
newer aircraft

Seriously - in some instances (particularly low speed highly sensitive
systems) a split ground plane can actually be a good thing, but in a
mixed signal system it's asking for trouble.

FWIW, the issues are currently on military aircraft - but it seems the
opposition aircraftd are worse than ours

Cheers

PeteS