Author Topic: How good is this PCB layout? It's my first board  (Read 272 times)

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Offline amin08

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How good is this PCB layout? It's my first board
« on: November 18, 2017, 07:16:17 am »
This is my first board designed in Eagle, and as a noob, I think that someone specialized in PCB layout should give me advice on how to do it well. :D
 

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Re: How good is this PCB layout? It's my first board
« Reply #1 on: November 18, 2017, 08:08:41 am »
PCB design is literally an art form, however luckily it has underlying principles that tell you whether its likely to run well or not.
Most of the following are improvements, there is always a trade off for how long the improvments take to implement vs how much you gain by making then,

Ok, so first off the mark, you have multiple trace breaking the ground plane under USB differential pairs, this is a no-no

Next up the differential part is quite different in length, likely outside the spec, have the differential pair exit left tightly grouped then run to the micro, this will decrease the skew.

The 3 pin regulator without its tab actually connected to ground, those via's do almost nothing for it, as fiberglass is an insulator instead you should create 2 small filled zones for that tab (one on each side), and via stitch only in that zone,

For the crystal, turn the left crystal capacitor 180 degrees and hop the right crystal trace with it, you want both there ground pads very close to the top left ground pin of the micro,

Your digital wires follow some very odd looking grouped routing, e.g. top left, space them a bit wider, to reduce crosstalk, and run them a bit more direct.

Your reset pin trace to the ICSP header crosses a lot of traces, if noise couples in to him, it can cause weird glitches,

The lower mounting hole does not look like it leaves enough room for a screw head.

D4 can be run on the top side, however you chose to jump him to the bottom.

Your analog traces cross many digital traces,

The diode in the bottom left could be rotated 90 degrees counter clockwise and would tidy up that power trace wiring,
 


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