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AD9361 - 4th harmonic (HD4) becomes larger than fundamental.

Question asked by nsuzuki Employee on Sep 22, 2014
Latest reply on Sep 23, 2014 by tlili


I'm evaluating TX performance of AD9361.
Then, I found a problem.

When configuring AD9361 as TX frequency = 1000MHz and ATT = 89.75dB (max),
signal level of the 4th harmonics (HD4) becomes larger than fundamental signal (1000MHz, CW).

CW (1000MHz) : -80.4dBm
HD4(4000MHz) : -75.9dBm

Does anyone advise me the reason of this behavior?