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LMX2595EVM: The problem of LMX2595's output frequency.

Part Number: LMX2595EVM

Tool/software:

Dear TI's engineers


  We use the LMX2595EVM to generate a chirp signal with a central frequency of 13GHz and a swept bandwidth of 500MHz by the automatic mode of the evaluation board.  However, I don't know why there always is a point-frequency signal at 12.87GHz. When I change the central frequency to 14GHz, the point-frequency signal still exists, and its location is at about 13.87GHz. Would you have any idea about the problem? Thanks a lot. 

Best regards,
Jieru