Dear ADI Team
My customer is using AD9361. They have done measurements with AD-FMCOMMS3-EBZ_Evalboard with AD9361 (on-board 80 MHz reference used). They have carried out measurements for all channels for GSM/ DCS/ PCS. However they see a lot of spurs in the spectrum.
From the frequency contour plots they conclude that the majority of the spurs is caused by harmonics of the reference clock (i.e. n x 80MHz or n x 40 MHz). This was confirmed by using an external signal generator and using other values of the reference clock frequency (e.g. reference clock frequency of 65 MHz). Then they still see the spurs on the multiples of 65 MHz.
Can you please advise how to improve on the spurs observed in our measurements?