9009 image rejection


I am having some strange phenomenon with the image rejection. See attached slide for details.  Would like to check if this is expected. 

  • 0
    •  Analog Employees 
    on Jun 11, 2020 12:38 PM 4 months ago

    Please try by decreasing the input signal level in order not to saturate the path. You can also try in AGC mode

  • Hi , 

    I think the 9009 is not in the saturation mode. The input signal is -16dBm. Nevertheless, I can try with a much lower input level and AGC mode. 

  • Hi, I try using a lower input signal and also AGC, the image problem still exist. I attached a slide for more information

  • 0
    •  Analog Employees 
    on Jun 15, 2020 9:35 AM 4 months ago in reply to ppp

    Can you check by running only init calibration? Keep the QEC tracking cal disable and then check the image levels? What is the application for which you want to transmit the tone frequency at both sides of the LO?

  • Hi, 

    I am actually doing in the receiver measurement. I am just trying out what if there are actually 2 freq tone input into the 9009.

    When the QEC tracking was off, the image level is about 70dBc. 

    I read from the application note, that keeping the QEC tracking on improves the image rejection.