Noise on board with PN512

[piotrh]

Hello, my own board with PN512 generates noise on higher(12-18) harmonic frequences (162.72, 176.28, 189.94, 203.4, 216.96, 230.52 and 244.08MHz).
On power line there are 100uF(tantal), 100nF(ceramic) and 100pF(ceramic) capacitors, on NRSTPD line 100pF, on SDA/SCL 33pF.
I tried with different capacitors, but still no success.
What else can I try to suppress this noise?

[piotrh]

Thank you for answer. Now I know, what probably is wrong - long traces from PN512 to EMC filter.

Regards
Piotr

[Fabian_R · Accepted solution]

Hello,
My apologies for the delay in answering back, Have you checked our antenna design video series, I'm posting the link for this guide. I'll recommend you to check 4th video of the series where you can debug and optimize your design with an antenna already printed.

https://www.nxp.com/video/nfc-antenna-design-4-optimization-debugging:ANTENNA-DEBUGGING-VIDEO

Thank you for using our products, we really appreciate your preference.