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  • Case ID: 324285
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Noise on PCB during 2.4GHz RF transmission

MinhDuc

Hello friends, 

I am using nrf52840-CKAA for my customize PCB. 

I am facing the noise during RF transmission on my ADC. The peak noise happen when I send a packet of data via RF antenna. 

Power_Tx = 4dBm

 

When I decrease the Tx Power to -12dBm, the peak noise was gone.

I wonder that MCU takes a lot of power during RF transmission so it affect to the stability of power line. 

In nrf52840-CKAA, currently I tie all VSS pin together instead of tie each of them directly to the GND plane. Is it the problem? 

I appreciate all your suggestions. 

Minhduc

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    Hi

    What pin(s) are you using for ADC on your nRF52840 SoC? As you can see in the nRF52840 pin assignments section, some GPIOs are recommended to use at standard drives/low frequencies. That is because these are located near the radio, and can affect radio performance. It is also thus possible that the radio can affect pins/lines that goes close to the ANT pin/trace. 

    Regarding your second point, I will need to check that with one of my more "HW oriented" colleagues and get back to you. Thanks for your patience!

    Best regards,

    Simon

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  • 0

    Hi

    What pin(s) are you using for ADC on your nRF52840 SoC? As you can see in the nRF52840 pin assignments section, some GPIOs are recommended to use at standard drives/low frequencies. That is because these are located near the radio, and can affect radio performance. It is also thus possible that the radio can affect pins/lines that goes close to the ANT pin/trace. 

    Regarding your second point, I will need to check that with one of my more "HW oriented" colleagues and get back to you. Thanks for your patience!

    Best regards,

    Simon

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