How to Route a PCB in KiCad | Sierra Circuits
Channel: Sierra Circuits
Date: 2020-07-07

In this tutorial, we will show you how to execute PCB routing in KiCad. Let us go through the PCB stack-up before we get to the PCB routing.

We selected an 8-mil track width and spacing for the differential pair. But this needs to be done in a proper way, according to the stack-up that contains certain requirements like impedance, number of layers, thickness of the PCB, etc. Depending on the requirements you can generate a stack-up. 

You can see in this stack-up a 90-ohm impedance on the top layer 1 and layer 4 (signal layers). The outer dark green layers in the stack-up are the top and bottom solder mask. The yellow layer represents the core and the light green layer the prepreg.

The 0.5 oz copper foil comes with a 0.5 oz plating, so in total it will be 1 oz. These outer layers are 1 oz and the required finished thickness is 62 mils. This is the total thickness of the board. And this is the estimated thickness of the lamination. So, this has a tolerance of +/- 6.2. The top and bottom layers have a 90 ohm impedance and a differential line width of 5 mils. You can see that the finished line width is 5 mils for layer 1 and layer 4 and the finish spacing is 4 mils.

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https://www.protoexpress.com/kicad-quote-plugin/?utm_source=youtube&utm_medium=social&utm_campaign=kicad%2Btuto%2Bplaylist%2Bnov%2B2024

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