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Not Sinus - FMCOMMS1 with ZedBoard  running without OS

Question asked by MiTfreak on Jan 23, 2015
Latest reply on Apr 1, 2015 by AZubair



I asked this earlier as part of other question (on which I got answer, but on this part not).

When I use tutorial AD-FMCOMMS1-EBZ Quick Start Guide on Xilinx FPGA Boards Without OS [Analog Devices Wiki]

and transmit signal from one antenna to another on same board I do

not get sinus waveform. I tried to change test.c script, also

I tried to use look up tables for generation of waveform insted

of default DDS approach (a changed part in main.c to call dac_dma_setup()...)

But whatever I do I do not get sinus waveform in Vivado Analyzer. I do not

even get how DAC works, because it behaves really strange (if I send square

waveform I got something like square waveform but not square waveform).


My sinus wave looks like it is modulated on some carrier... Could anybody explain

me what is wrong (maybe there is problem on FMCOMMS1). Results are below.





Thank you in advance on answer,