Electronics > Beginners

Impedance calculation double sided board

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FriedMule:
Hi I have tried to calculate track impedance, using a online calculator but I do not know how to calculate my board.
It has a track on one side and a fill layer on the other side, both connected by vias.

How do I calculate the total impedance?

Illusionist:
There's a really useful, free tool you can download here:

http://www.saturnpcb.com/pcb_toolkit/

The impedance is calculated on: PCB (dielectric) material, thickness, copper thickness and track width. Note that board thicknesses are often given as copper+dielectric thickness, so if it's double sided 1.6mm, the dielectric is 1.6mm minus 2* the copper thickness.

The tool above is really handy because it does some of the conversions for you (for instance converts oz of copper layer to mm/mils etc). It can do a lot - have a play and get used to it.

T3sl4co1l:
So the track is connected to the fill with a via?  And you need to know the impedance of this effective transmission line stub..?

Tim

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