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Carrier is appearing on TX output of fmcomms2 board.

Category: Software
Product Number: fmcomms2 ot ad9364
Software Version: No-os 2018.3, hdl_2018.3

Hi ,

I am trying to generate a chirp at a carrier frequency of 310Mhz. The chirp would be sent out at a regular interval. Chirp signal is generated from xilinx DDS. However i could see that the carrier which is fixed at a frequency of 310Mhz is always present in the output. Ideally the carrier should not appear in output based on the maths shown here ( ). Here is a pic of signal capture.

 Could anyone explain why does carrier appears in the output and how can i avoid it?

Thank you