DS90UB962-Q1: EMC test questions

Hi Kailyn,

I don't see the attached test report but 1600MHz sounds like the speed of the CSI communication. I would recommend shutting down specific features of the device to try to isolate the source of the radiation. Once you know where it is you can try to add additional shielding/protection to that part of the system.

Regards,

Nick

Hi Nick，

I am sorry to forget attached the test report, please for your reference.

gnss 1.6G-1.pptx

Best regards

Kailyn

Hi Kailyn,

I see the spike you are referring to but is there anyway you can verify the source?  Like I mentioned try to turn off the CSI port or use near field probes to locate the source?

Regards,

Nick

Hi Nick，

Below is the test results when the probe is near the field and we could found that there is also 1600Mhz spike. In addition, he would like to confirm if he need to used shielding/protection during design. 

Best regards

Kailyn 

Hi Kailyn, 

Where is the source of the 1600MHz exactly?

Also, you should try to shield components that are switching whenever you are doing EMC testing.

Regards,

Nick

Hello Nick,

The source of 1600Mhz  is the probe near the CSI clock, and it would appear 1600Mhz frequency point.

Best regards

kailyn

Hi Kailyn,

Im not sure how to help here?  Do you need some guidelines on how to design a board around EMC?

Regards,

Nick