Attached photos are describe spectrum image of “ADALM PLUTO” module, TX output chain.
You can see very Strong odd harmonics.
It is important for us to understand if these harmonics can be filtered in the level of the chip? ( I guess not).
Additionally as we discuss few weeks ago together with Eli we need to know if this issue exist also in ADRV9002?
Yes, these odd harmonics will be seen at the output as the LO is a squared LO(squared LO is a composite of the fundamental and its odd harmonics. 3rd harmonic will be 1/3 of the fundamental amplitude and so on). So the levels of the harmonics will be higher. There is no way to eliminate them.
You can post your in the below forum for queries on ADRV9002:
The customer designs his own board based on Pluto.
are they any design recommendations to eliminate these harmonics?
Maybe we can eliminate the harmonics by doing calibration?
Is it any calibration that intended to eliminate the harmonics? Maybe SW filters / algorithm update?
We donot have any internal calibration implemented for eliminating the harmonics. You have to use appropriate filters at the output to eliminate these.