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Internal planes of a four-layered PCB

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Meklaud

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I have a four-layered PCB and I have done initial placement and routing.There are tree types of supply voltage(3.3, 5, 1.8 V) and now i am about to make internal power and ground planes.Are there some resources on this topic,because all of my previously done PCB's were in two layers so I don't have experience in this four or more layers. Is there some useful resource that someone could recommend to me, be it a book or URL etc.

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jdhar

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Internal planes?

Look for the book 'high-speed digital design' by Howard Johnson, that's a good starting place. However, keep it simple for a 4-layer; use one of the internal planes as a GND plane (solid - don't split it), and then split your power plane. Normally, there are only a few devices which use 5V, so you can run a thick trace to those if they aren't critical... then you can use a small power island for 1.8V (assuming that some device is using that as it's core voltage), and leave the rest of the plane for 3.3V
 

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