The bottom line, however, is that it is best that you consult your board fabricator upfront, and when in doubt, try to stay with an oversized estimation for trace width/gap, so that you have a room in your board later to narrow them after you solidify the spec with your fabricator.

Here is another paper comparing web calculators and Simbeor SFS integrated in Layer Stack Manager since its inception in 2020: If you are making these type of adjustments you should consider any possible ramifications from those settings. Ultimately you could consider adjusting the spacing 'S' to the ground shielding to a significantly large value. 'impedance controlled' it is just differential pair routing. If you also have no reference on each side of the routing then theoretically this is not coplanar i.e. !support-for-coplanar-transmission-line-structures Reference plane is also another parameter frequently overlooked, and if unspecified for Coplanar configuration, Altium assumes that it is on the same layer as the signal with S (clearance) being the only dependent parameter associated with adjacent conductors. Why does the impedance calculated in Layer Stack Manager differs from that of an online calculator? From Polar or any other field solver solution out there? Solution DetailsYou can read more here:Īdditionally, options such as 'Use Surface Finish' and 'Use Solder Mask' in Layer Stack Manager could attribute to the difference from a web calculator result, typically without such consideration.

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