[SI-LIST] Number of Power Planes in a Stack up

Hello All,
 
Is there any criteria for deciding the number of power planes in a PCB stack up 
? I read in a paper that for a 62 mils thick stack up there are 3 power planes. 
 What decides this ? Is it the number of active devices and their power 
requirements that decides ?
 
Along with that, can we use the spilt planes for reducing the number of power 
planes ? Or are the split planes used only for more and more dender designs ?
 
I was just thinking that use of split planes instead of more seperate planes 
will reduce the power plane noise. Is it correct ? Please give me your 
suggestions. Thank you.
 
------------------
Vysakh Sivarajan
Graduate Research Assistant
Electromagnetic Compatibility Laboratory
Missouri University of Science and Technology
 
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