We are using AD9364 in ZYNQ platform. We are mixing 1MHz single tone with an RF carrier of 99MHz. Apart from the main tone at 100MHz, we observe LO harmonics of 300MHz, 500MHz. We have also observed the same problem for all carrier frequencies. Screen shots of the configuration settings as wells as the transmitter spectrum captured on a spectrum analyzer are attached . In the spectrum plot , it can be seen that the undesirable harmonics at 300MHz and 500MHz are only about 12dB and 18dB respectively below the desired output.