AD9361 - DC Leakag(LO) Present at TX

Dear Fellow Engineers

   i am new to the engineering community and currently working with AD9361. Through out my research so far, i have seen the Presence of DC Offset (DC Leakage from Mixer inside ad9361) on the TX side as shown below in attachment. This is the something that i would like to remove or minimize even more so that it is negligible.  Any helpful feed back or suggestions will be greatly appreciated.  Thanks

DC is at MR (Unwanted)  and M1 is just a single tone.

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  • 0
    •  Analog Employees 
    on Aug 22, 2018 11:16 AM over 2 years ago

    DC offset is specified for max output power. The dBc level will not be linearly decreasing when you decrease the Tx power.

    Can you try measuring same again with 0 dB attenuation and Tone power at -3 dBFS.  In this measurement if you are not getting LO leakage  better than -50 dBc , you need to check on the calibrations.

    If your requirement is to operate at a lower power and the LO leakage is higher than requirement , recommend to use an external attenuator for this application.

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  • 0
    •  Analog Employees 
    on Aug 22, 2018 11:16 AM over 2 years ago

    DC offset is specified for max output power. The dBc level will not be linearly decreasing when you decrease the Tx power.

    Can you try measuring same again with 0 dB attenuation and Tone power at -3 dBFS.  In this measurement if you are not getting LO leakage  better than -50 dBc , you need to check on the calibrations.

    If your requirement is to operate at a lower power and the LO leakage is higher than requirement , recommend to use an external attenuator for this application.

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