Re: [PSES] SV: [PSES] PCB layout technique - multilayer

[Gert Gremmen]

It s an extra layer you might allocate to that low frequency signals , 
analog signals and or extra power supply.

On 10-2-2020 10:22, Amund Westin wrote:

Thanks Gert

I want to read your advices with great attention.

Just one immediately follow-up èThis Misc layer, is it an extra layer 
for signal routing, as a Sbott3?

Mvh Amund

*Fra:*Gert Gremmen
*Sendt:* 10. februar 2020 09:57
*Til:* Amund Westin <am...@westin-emission.no>; EMC-PSTC@LISTSERV.IEEE.ORG
*Emne:* Re: [PSES] PCB layout technique - multilayer

Just 2 hints of thousands:

If you implement 2 ground planes make sure the ground references on 
top and bottom are related to the closest ground layer .

The stack will than be:  Stop -- GND --Stop2 -- PWR - Misc - Sbott2 - 
GND -Sbott     ((S=signal))

(basically you route 2 x 3 layer boards critically, and bond them 
together with a power plane in between.)

The signal should not cross the board and be tempted to flow on an 
opposite ground layer, but

will remain always close to the corresponding ground layer.

Make sure both ground layers are extremely well coupled together, esp 
on board edges

If you implement SMPS locally give it a local top layer ground area to 
connect the principal

switch elements together. Connect by a dice pattern 5 via to main GND

Good luck.

Gert Gremmen

On 10-2-2020 8:27, Amund Westin wrote: contact to the nearest ground 
layer,

    I’m looking for articles about how to do good EMC layout on
    multilayer PCB.

    Choice of PCB layer stacking (8 or 10 layers) and basic routing
    techniques are the issues of most importance right now.

    Appreciate if you have some experience about good or bad layer
    stacking.

    Thanks!

    Best regards

    Amund

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