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AD9361 - TX HD2/HD4 harmonics performance

Question asked by nsuzuki Employee on Sep 22, 2014
Latest reply on Sep 26, 2014 by tlili


I'm evaluating TX performance of AD9361.
Then, I found a problem when measuring TX harmonics via spectrum analyser.
When changing TX ATT with 0.25dB steps, output level of even-order harmonics like HD2 or HD4 was suddenly changed as attached picture below.

Does anyone advise me the reason of this behavior?