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Why are we lossing strength significantly on the TX output of the Avnet boards when we go to frequencies above ~4GHz?

Question asked by S.Garza on May 15, 2017
Latest reply on May 22, 2017 by S.Garza

We need to use either the TX1A or TX2A output of an Avnet board with AD9361 in it to generate a Signal on which we'll be changing the frequency doing a gradual sweep from 1 to 6 GHz. However we have observed that the strength of the TX signal gets reduced significantly as we increase the frequency in the TX LO, mainly when we go above ~4GHz.

We have 2 of these Avnet boards and we have observed the same behavior in both of them.


Has anybody experienced this TX signal strength reduction on high frequencies?,

If so, based on your experiences, is there something we can do to prevent this behavior?


Due to this limitation, until now we have had to use an external Signal Generator as TX source on our Application's prototypes, making use only of RX1 and RX2 on the Avnet AD9361 board, but it would be very cost convenient for our project it we could be able to use either TX1A or TX2A of AD9361 to generate our System's TX signal.


We would really appreciate it if somebody could give us any help to solve this problem.


Many Thanks in advance,


Sergio Garza