Nonetheless, a 4-layer PCB design consisting of ground and VCC plane layers and two signal layers is more preferable. This design does struggle with impedance and propagation delays, though.

Finally, your favorite PCB layout tool may not support four-layer boards. Eagle’s free version is limited to two layers, as is Fritzing.

A visual representation of the board layers is shown in Figure 3. The table details a typical four-layer PCB setup. 3. A sample four-layer PCB.

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