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CC2630: When Vin 3.3V, No RF signal and Vin 3V is OK

Walsh
Intellectual 950 points

Part Number: CC2630

Hi,

We used CC2630F128RGZR(7X7) for Zigbee node. We met a issue when debug.

When Vin=3.3V, there is no RF singal and can't networking. But when hand touch the PCB trace antenna, The RF is OK.

When Vin=3V, The RF is OK.

We tested CC2630EVM and it is OK.

PS: The PCB is smaller than CC2630EVM and two layers.

Could you kindly help to check the issue and give some suggestions. Thanks.

Schematic

Thanks

Walsh