EMI problems with DEMO-CR95HF

[per]

Posted on July 01, 2013 at 12:10

Hej!

I just bought a DEMO-CR95HF board to sort out EMI problems that I have with my own design with the CR95HF chip. To my disappointment the DEMO board generates more harmonics than my own design. My measurements can be found at

http://milvus.nothagen.se/pub/strfid/rfid.htm

Also, when I checked the resonance frequency of the antenna I found that it was tuned to 15.2MHz and not 13.56. The resonance frequency was measured using a spectrum analyser with tracking output.

Therefore I wonder:

Is DEMO-CR95HF designed for optimal performance?

Is there any known optimization can can be done to the board to improve performance?

I was planning to use the layout for the circuit between the chip and the antenna. As a consequence of my measurement above I really wonder if you would recommend that? I have also looked at the layout of PLUG-CR95HF-B which is slightly different. Is that layout better?

Best Regards

Per Nothagen

Senior Engineering Manager

Triacon AB

#cr95hf #emi-filter #demo-cr95hf-a #plug-cr95hf #cr95hf

[Anais GALLIGANI]

Posted on July 15, 2013 at 15:51

Dear customer,

Might you send us your email address please?

Thanks a lot,

Have a nice day,

All the best,

NFC/RFID dynamic tag support

[byronl]

Posted on May 30, 2014 at 15:35

Hi Nothagen, 

Did you ever resolve your harmonic issues? I am battling with the same issue and any advice you can give would be appreciated

Best Regards

Byron Loader

[Anais GALLIGANI]

Posted on August 29, 2014 at 17:38

Hello ,

For such kind of question, please get close to your ST sales or use Online support tool.

Thanks a lot for your comprehension,

Have a nice day,

ST NFC RFID Dynamic tag support