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TRF370417 - Effect of distortion of the LO input is given to the output

Ryuji
Guru 20090 points

Hello,

Is the distortion of the LO inputs leaked to the RF output ?
Since there is no PLL in the device, I think that the distortion of the LO inputs leak to the RF output.

Best Regads,
Ryuji Asaka

  • 0
    TI__Mastermind 18095 points

    I am not sure that I follow what distortions on the LO you are referring.  You will see some of the LO signal at the output.  This is due to DC imbalance on the baseband inputs and partially to the LO to RF isolation.  Optimizing the DC offset balance eliminates the carrier feedthrough performance.  If there are LO spurs then that will get "mixed" just like the fundamental itself which leads to distortion on the output.

    -RJH 

  • 0 in reply to RJ Hopper
    Guru 20090 points
    Hello Hopper san,

    For example, if we input the square wave to the LOP/N input.
    And if the duty of square wave was varied , the THD is increased.
    Does this distortion will affect the RF output?

    Best Regards,
    Ryuji Asaka
  • 0 in reply to Ryuji
    TI__Mastermind 18095 points

    Asaka-san:

    Operation with a square wave is OK, though not typical as it is difficult to maintain a true square wave at RF frequencies (as all of the harmonics tend to get heavily attenuated).  I do not have any data related to performance with duty cycle variation.  My gut feel is that the performance would suffer.  I think there would be a spurious offset equivalent to the deviation from ideal (50%).

    --Russell