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How is the amplitude of data_in converted

Question asked by diegonolovich on Dec 16, 2015
Latest reply on Dec 22, 2015 by ACozma

Hi - While I fix my first FPGA board, I am using a second ZC706 with FMCOMMS3. With this setup, I am using Simulink and a modified ad9361_sim.slx with a Spectrum Analyzer block at DATA_OUT1 to see if the discrete sine wave that I send through DATA_IN1 is correct. My parameters are as follows and my questions are right after:

 

Sine Wave Block Amplitude: 200 (tried 0.,25 - 32768 values to see if it resolved; it did not)

Sine Wave Block Frequency: 1.4e6

Sine Wave Block Sample Time: 1/30.72e6

Sine Wave Block Samples Per Frame: 32768

 

Input Data Channel Size [samples] = 32768

Output Data Channel Size [samples] = 32768

RX and TX LO: 2.4e9

RX and TX Sampling Frequency: 30.72e6

RX and TX Bandwith: 5e6

 

I have two questions. First, my y-axis is showing my side-band peaks at 85 dbm and the carrier at 50 dBm with the noise floor at about 30 dBm. Why is this displaying so high?

 

Secondly, and referring to the title of this post, what does a sine wave amplitude of 200 at the DATA_IN1 mean? How does that relate to the transmitted power?

 

Thanks,

-D

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