PCB-Stack Design Papers

PCB Stack-Up -- Part 1 - Introduction
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PCB Stack-Up
Part 1. Introduction
PCB stack-up is an important factor in determining the EMC performance of a
product.  A good stack-up can be very effective in reducing radiation from
the loops on the PCB (differential-mode emission), as well as the cables
attached to the board (common-mode emission).  On the other hand a poor
stack-up can increase the radiation from both of these mechanisms
considerably.
Four factors are important with respect to board stack-up considerations:
1. The number of layers,
2. The number and types of planes (power and/or ground) used,
3. The ordering or sequence of the layers, and
4. The spacing between  the layers.
Usually not much consideration is given except as to the number of layers. 
In many cases the other three f