Depends...So what if the number of rails is small, lets say 3, and the current draw requirement is not some large value like 50A?
Sounds if you did not design any other PCB before.My dream hobby project is to design an FPGA board conneced to DDR3 RAM. This is where the question come from.
Aren't thousands or even millions in the internet enough?if you know of any PCB designs that are done professionally and I can view to learn these concepts, that would be great and helpful.
In theory.Power can be delivered in the same layer as the signals, by using PCB tracks that are wide enough to carry the required current.
I agree. It´s low impedance at the capacitor.If we use PCB tracks and then use lot of decoupling capacitors, doesn't that in theory also lead to less impedance?
Hello,For high speed board design, having dedicated GND planes that are all linked together using stitching vias (to reduce impedance for return path) is essential. However, it is not clear why one would need a whole dedicated power plane in the PCB stack up.
Power can be delivered in the same layer as the signals, by using PCB tracks that are wide enough to carry the required current. Using decoupling capacitors is actually important to smooth the ripples on the supply that can form due to switching activity in the digital ICs. As long as one ensures that the PCB tracks are wide enough to carry the required sustained peak current (I believe), we can use it to deliver power.
PCB stackup has a large impact on PCB manufacture cost. If a whole plane is dedicated to power, it must not have any breaks/cuts in it. We want to use as few layers as possible to design a PCB. Since PCB tracks are good enough, why would one ever need a whole dedicated PCB layer for power?
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