Bootcamp PCB Layout Checklist

Owned by Nolan Haines
Last updated: 2024-06-10 by Jerry Tian
2 min read

PCB layout can be a daunting task, especially for someone just starting! This page includes a checklist that outlines the most important things to properly implement your LDO with respect to the layout of the board. Useful both for bootcampers and bootcamp reviewers. Also refer to PCB Layout Review Checklists for more information.

 

Decoupling capacitors are placed as close as possible to the parts they are decoupling. If multiple caps are used, place them closest from smallest capacitance to largest capacitance
No polygons are shelved (Google if you don’t know what this is), and all are repoured
No dead copper from any polygons
Thermal reliefs (again, Google if you dont know what this is) used for all parts, except for parts carrying high amounts of current - allows for easier rework
No components underneath other components (check 3D body clearance in 3D view)
No antennas (bits of copper that stick out that arent connected anything - see Figure 1). Can be resolved by putting ground via(s) into the affected area or removing the antenna entirely.
Any 3-way intersections have traces perpendicular to each other. Do not have a trace that sticks out at an angle then becomes straight (see Figure 2)
PCB has a ground plane - your board has more than one layer, so use that to your advantage! Have one layer that is entirely a ground polygon and connected to the top with vias.
No angles < 45 degrees for polygons
Traces are routed without acute angles
When a trace needs to change direction perpendicularly, does not do so at a 90 degree angle. Instead do two 45 degree angles
Traces are appropriately sized for the amount of current
Avoid overlapping polygons. Overlapping polygons of the same net should be merged into one
Figure 1: a good example of an antenna. Avoid these as they can cause huge problems!
Figure 2: Routing a 3 way intersection in a PCB. Top is what is to be avoided, bottom is usually what you want. Even better if you add a chamfer but not necessary here.

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