Tips for PCB Design

Dated:2017-03-03      Popularity:1411

PCB Board

Before placing the components as well as when you are doing the PCB layout, there are some points should be kept in mind.

1. Analog signals are highly affected by high-speed and switching signals. Guard the signal with the ground trace and stitch the ground trace with the vias to create a shielding for the analog signal. Do not share the ground planes of analog and digital subsystems, and isolate them with inductor or ferrite bead. 

2. A return path of the signal should run closely in parallel with the associated signal trace to provide least reactance path creating the shortest current loop.

3. Differential lines must run in parallel to cancel the magnetic fields of these out-of-phase lines. Adjust the length of shorter running differential line near the source by adding a small serpentine.

4. Keep high-speed signals and clock traces as short as possible and keep them nearer to the ground plane and away from the board edge. Vias in such signal near the connector and PCB edge must be avoided. Keep away such signals from power plane as well to reduce the inducing noise on power planes.

5. Use planned board stackup to avoid cross talks and to keep proper reference planes for high-speed traces.

6. Use shielded cables for high-speed data lines or twisted pair cables. Use multiple return paths in a flat ribbon cable.

7. Use via stitching to create a cage for internal emissions to be inside and external emission to be outside. It should be done as per your manufacturer's capability, keeping in mind that the tolerances and clearance constraints are met.

Hope it is useful for your next design.

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