Hello, I am now studying ad9361 data launches.The I data and Q data are generated by matlab.The code is shown below。

N=16384;

f0=1*10^6;

fs=4*10^6;

t=0:1:(fs/f0)*N-1;

I=cos(2*pi*f0/fs*t); Q=sin(2*pi*f0/fs*t);

The filter coefficients are configured as follows：

TX: LVDS, FDD, DDR. The fb_clk is data_clk from the ad9361.The LO is 120M.

Now, thespecturm of output of AD9361 is as follow.

The spectrum has three components ： 116M,120M,124M.

There is two questions.

1.The configured filter coefficients are correct?

2.Why spectrum has three components?

I hope you can give me some advice！Thank you!

What is your input signal. ?

You will see LO leakage and Image frequency in your spectrum output.