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AD-FMCOMMS3-EBZ Transmiter output waveform

Question asked by wqzhang on Nov 25, 2015
Latest reply on Nov 26, 2015 by mhennerich

Hi,

 

I am using AD-FMCOMMS3-EBZ and ZC706 with example FPGA design. when testing transmitter of AD-FMCOMMS3-EBZ with the LINUX "ADI IIO Oscilloscope" software, it is working but the TX1A output waveform captured from a scope looks not so correct.

ad9361_LO160m.bmp

the setting is as following:

ad9361_config.bmp

since the transmitter TX LO is set to 160Mhz, and the "DAC Buffer Setting" is loaded from an example file "10.txt", so the output should be a 160MHz sine wave, but it looks it is NOT.

 

the freq is correct, but the waveform looks is chopped from since wave or in wrong polarity or wrong format, why?

 

I tried to change the setting of filters and tried I tried FDD and TDD, but there is no difference.

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