nRF905 phase noise

[Az-eddine]

Hi ,

can anyone tell me what can cause these disturbances around the unmodulated carrier?

IMG-20171110-WA0017.jpg

We checked all components arround the IC it's all ok.

Can be phase noise ? it depends on the nRF905' VCO?

16 Mhz EXTAL

Many thanks

[ovrebekk]

Hi

Apparently this could be noise on your power supply.
Are you able to test using an external power source, like a lab power supply?

You might want to scope your supply lines as well, and see if you can measure the noise.

Best regards