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regarding third order harmonic distortion in ad9361

Question asked by manideep on Nov 21, 2016
Latest reply on Jan 23, 2017 by sripad

Hi,

              The  question was more with regards to the higher order LO harmonic levels that are generated from the internal PLL synthesizer.

As per the data sheet the  third order harmonic distortions  are around  @-30 dBc @1.4GHz and 2.4GHz @ 0 dB attenuation. But we observed  third order harmonics  in the final out put is around  -14dBc  @1.4GHz  and  -21 dBC  @ 2.4GHz @ 0 dB attenuation  in the evaluation board of AD9364.  If This  high  harmonic levels  of Tx / Rx LO is provided to an internal IQ Modulator/ Demodulator , then the performance of the IQ modulator and demodulator  is degraded due to  Phase imbalance and amplitude imbalance. why i am getting worst third order harmonics in my out put . please let me know to  to improve odd order harmonics in the  LO out put.

 

Thanks ,

lakshmi

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