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AD9361 TX spectrum issue

Question asked by lungshen157 on Apr 19, 2016
Latest reply on Apr 19, 2016 by tlili



We have our own AD9361+ FPGA board.

The FPGA design is referred to FMCOMMS2 HDL reference design, and the Microblaze is running non-OS code.  The UART console displays "successfully initialized" message.  All the settings are default in non-OS code. We turned off the dds tx tone and measure the TX output with spectrum analyzer.  Below is the screen capture .

We've compared the same design on KC705 + FMCOMMS2, the analyzer output looks much smoother at the area close to the peak (2.4G center).  Any clue about the noise coming from ?   Thanks for your help !