Hi,

I am trying to calibrate the FMCOMMS4 (AD9364 transceiver) board, programmed with Xilinx Zynq MATLAB toolbox. After setting up the 'GainSource' parameter to 'Manual' with 0 dB, I send a tone with the function generator, try to receive it in RXA port and then I plot the spectrum of the tone. I have checked it out that when I choose a 'BaseBandSampleRate' higher than 10 MHz two strange lobes appear at the ending of the effective filter (I think it is caused by decimate). Do you know how to eliminate it?.

Thanks. I attach some photos about the problem and the MATLAB code.

More noise around fs/2 is due to sigma delta ADC noise shaping, When RF gain is very small, RF signal chain noise floor is dominated by the ADC Nosie floor, if the Over Sampling Ratio is big enough, (HB1/2/3 enable), It makes the K >=8, so the inband Nosie floor ( DC~fs/2 ) [fs=output DataRate] is flat. if K=1, the noise floor is the standard sigma-delta noise floor as observed.

refer below post for details

AD9361 passband at low Rx gain isn't flat