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AD9361 RX/TX VCO pulling issue

Question asked by CDFUTURE on Mar 22, 2017
Latest reply on Mar 27, 2017 by sripad

Hi, ADI friends

 

I do some test as below:

My question is :

Why there is big influence to TX signal's spectrum when change the RxLo frequency?

 

TxLo=1.3Ghz , RxLo=1.3Ghz Tx baseband=1Mhz, The spectrum as below, it looks OK.

Then I change RxLo=1.30001Ghz, TxLo still in 1.3Ghz, but the spectrum as below :

 

 

Then I change RxLo=TxLo=1.30001Ghz the spectrum as below:

 

Last test RxLo=1.3Ghz, TxLo=1.30001Ghz, the spectrum as below:

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