I am having some issues with spurs when looking at the RF signal with a spectrum analyzer. The problem disappears when using __WFE() at the same time as sending constant carrier. As you can see it is also affecting the overall shape of the signal.
Maybe it is related to power supply and decoupling capacitors, but when I'm doing various testing with capacitors I am not able to affect the result at all. I have also tried using a battery as power supply but it did not help either.
Any suggestions on what I should try?
