Hi,
I came across this so called "excellent" stackup for EMC/SI in a document and would like to consider using it but I do have a question regarding impedance calculations. Which layers should be taken as reference planes for signal layers 4 and 5? For example, is it layers 3(GND) and 6(PWR) for layer 4 since they are the closest planes to this specific layer? or should we even consider layer 6(PWR) as reference since it is quite far away?
Another question regarding this stackup is what would be a good distance (ignoring the manufacturer preferences for the time being) between layers? From the looks of it GND and PWR layers are very close to each other so if we give it a thickness of x1, would the others be x2 between L1 and L2, x4 between L3 and L4 and x20 (maybe) between L4 and L6?
Thank you in advance for sharing your thoughts.
Regards,
Beko
I came across this so called "excellent" stackup for EMC/SI in a document and would like to consider using it but I do have a question regarding impedance calculations. Which layers should be taken as reference planes for signal layers 4 and 5? For example, is it layers 3(GND) and 6(PWR) for layer 4 since they are the closest planes to this specific layer? or should we even consider layer 6(PWR) as reference since it is quite far away?
Another question regarding this stackup is what would be a good distance (ignoring the manufacturer preferences for the time being) between layers? From the looks of it GND and PWR layers are very close to each other so if we give it a thickness of x1, would the others be x2 between L1 and L2, x4 between L3 and L4 and x20 (maybe) between L4 and L6?
Thank you in advance for sharing your thoughts.
Regards,
Beko
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