Ferrites on Every Power Rail? Big Mistake | 1 Min PCB Design Review — Transcript

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1. 0:00Check out this One Minute Design Review for a 4 channel RFID reader.
2. 0:05The way you’ve set up all of your power rail naming is really confusing.
3. 0:08This 3.3V net gets renamed at least twice.
4. 0:12You have used ferrites everywhere on almost every power rail.
5. 0:15They can block power in the exact frequency range
6. 0:18where you need to draw power into a component.
7. 0:20In this case, if you need to set up very stable, very quiet power rails,
8. 0:24you should just use separate regulators to set up those voltages.
9. 0:27You could have probably
10. 0:28just put all of these traces on the back layer and done this as 4 layers only.
11. 0:32However, I understand why you did this.
12. 0:35It was so you could take advantage
13. 0:36of orthogonal routing on layers 3 and 4 and you did do that the correct way.
14. 0:40You don’t need all of this copper pour.
15. 0:42And you actually don't need any of this copper pour on the top layer.
16. 0:46If you're trying to do something like prevent crosstalk
17. 0:48or prevent raidated emissions, you're going to get a lot more benefit by
18. 0:51just using thinner dialectrics on the outer surface layers.
19. 0:54Want to have your design reviewed on the channel?
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