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a question about Power Planes

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qasmi

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Hello everyone,

I am designing a 4-layer pcb with 2 power planes (Vcc and GND) . The GND plane is further split into Agnd-Dgnd and the Power plane is split into +5V,-5V,+3.3AV, and +3.3DV.

what check list or Rules of thumb should I take into account for designing a multi-Layer pcb in general and this design in particular. A quick response will be appreciated. Thanks



Regards

Added after 3 minutes:

One more question I forgot to mention, What effect will the overlapping of different powers in VCC plane (i.e. +5V,-5V,+3.3AV, and +3.3DV) and GND plane have on the PCB. Thanks once again ......:)
 

 

1. All highspeed signals must be routed in one reference plane area.
2. If you change layer , make sure that you sandwich a gnd plane and if not
you can add via everytime you do a change layer.
3. Don't cross the highspeed signal on split planes.
4. Route signals on layers that reference to a gnd PLane layer.
 

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