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guide me to design a multilayer pcb

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ramalakshmi.chandana

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multilayer pcb ground

hello all,

am a pcb designer, till now i designed 2layer boards only.
now i want to design a multilayer(4layer) pcb.
In this am using the top and bottom layer as signal layers
2nd layer as gnd layer and 3th layer as vcc layer.
while giving the gerber data to fabricator is there any necessity to fill the all area in 3rd and 4th with copper (gnd and vcc respectively)?or do i need to loop like a mesh?how we can i see it in the pcb after fabrication.i saw many multilayer pcbs , but i didn't understand..how the internal layer stackups will be.can any one of u educate me in this regard..

--
Rama lakshmi.ch
 

multilayer pcb guide

Hello Ramalakshmi,

For the 4 Layer stackup u have specified the inner two layers 2&3 which are used for GND and VCC respectively are called as Planes in multilayer boards terminology.

The very first step in the layout creation is the STACKUP setup. Where you decide number of layers and then decide upon what layers should be Signal layers and Plane Layers.

The plane Layers can be Positive and Negative layers . In positive you will be abled to see the filled copper where as it is opposite in negative layers.

There is no means to see the inner layers of a PCB after fabrication. You can only see the outter 2 layers TOP and BOT.

:D
PCB Design is Fun for Me
Mashak.M
 

reference in multilayer pcb design

I would also suggest you go through these given books..(ebooks are available in this forum to download)
1)printed circuit board designer reference by Christopher t. robertson.
2)Printed circuit handbook by Clyde f.coombs.
Then if you are going to do high speed designs the i would suggest these
3) signal integrity issues & printed circuit board design by Douglas brooks
4) signal integrity-simplified by Eric bogatin is the book in depth about signal integrity..
5) High speed signal propagation by howard w.johnson.
you will get low price edition(5) High speed signal propagation by howard w.johnson. ) here in india for around Rs 300/-
Also browse through the various post here in this forum...
Get your basics right then its easier to learn more:)
 

multilayer pcb basics

ramalakshmi.chandana said:
hello all,


while giving the gerber data to fabricator is there any necessity to fill the all area in 3rd and 4th with copper (gnd and vcc respectively)?or do i need to loop like a mesh?how we can i see it in the pcb after fabrication
--
Rama lakshmi.ch
Click to expand...

You can use inner layer as for ground /Vcc or for signal. Or for both simultaneouly (some portion of a layer can be used for one purpose and some for other). Secondly it is a good idea to have one layer dedicated for ground and all the layer filled with copper, three thing achieved, one is it may act as a shield (if required), second it will reduced ground noises, third it will give more strength to pcb as compared to signal.

After fabrication you can't see the inner layer, exept for some black looking shades for tracks. For 4 layer it is little bit more abvious but for multi layer it will be a problem to look or see all layer. but through X-rays etc
 

pcb ground fill guide

This is really a good guiding for him to have basic knowledge about mutilayer pcb design.:D

smith_suez said:
I would also suggest you go through these given books..(ebooks are available in this forum to download)
1)printed circuit board designer reference by Christopher t. robertson.
2)Printed circuit handbook by Clyde f.coombs.
Then if you are going to do high speed designs the i would suggest these
3) signal integrity issues & printed circuit board design by Douglas brooks
4) signal integrity-simplified by Eric bogatin is the book in depth about signal integrity..
5) High speed signal propagation by howard w.johnson.
you will get low price edition(5) High speed signal propagation by howard w.johnson. ) here in india for around Rs 300/-
Also browse through the various post here in this forum...
Get your basics right then its easier to learn more:)
Click to expand...
 

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