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AD9361 amplify of receive signal incorrect

Question asked by Peter_Qu on Jun 21, 2016
Latest reply on Jun 22, 2016 by Peter_Qu

I received a sine wave signal  when I transmitted a sine wave signal with the AD9361 evaluation board,

1R1T, FDD mode, 2.5GHz LO.

The amplify of receive signal decrease when I attenuate the gain(Tx attenuation(0x073), MGC(0x109), and programmable Tx/Rx fir gain), but the signal appear obvious distortion.

The amplify of receive signal increase when I raise the gain, the signal is perfect ignored the amplify.

捕获.PNG

捕获.PNG

what is that? what is the problem? why the amplify is wrong?can anyone help me?

Thank you!

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