DS90UB914A-Q1: DS90UB914A-Q1-EMC issue

huquan huang

Part Number: DS90UB914A-Q1

hi team

I use the DS90UB914A and DS90UB913A，and I had fellow the“An EMC_EMI system-design and testing methodology for FPD-Link III SerDes.pdf” design my system，but there are also have the the RE issue，at the 430MHZ，it over the class B limit。how to fix this issue？ The circuit set as fellow

over 5 years ago

0 Jiashow Ho over 5 years ago

TI__Genius 11340 points

Hi Huquan,

Have you tried to isolate where on the board this noise is coming from? Using a near field probe.

You can try adding copper tape to the ground of the cable, make sure the system is shielded well, try possibly reorient the system to see if the noise disappears.

Jiashow

0 huquan huang over 5 years ago in reply to Jiashow Ho

Prodigy 50 points

hi jiashow

tks. more detail，we use five 913A, they work one by one through the switch.Now I test find only RF4 has the RE issue, I will connect the RF4 gnd and the RF3 gnd through copper tape. Do you have other advice?

0 Jiashow Ho over 5 years ago in reply to huquan huang

TI__Genius 11340 points

Hi Huquan,

Yes, that's a good idea. Maybe worth it to swap the 913A modules too to see if it's following the 913A or the RF seat.

Jiashow

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DS90UB914A-Q1: DS90UB914A-Q1-EMC issue