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Original question:

AWR1642: IIP2 and its impact

AWR2243: How to understand IIP2 spec in 2243 datasheet

Adam Yao94020
Genius 10910 points
Part Number: AWR2243

Hi champion,
    In 2243 datasheet, there is a IIP2 spec as below:

   May I get details about this spec:

  1. In-band IIP2, is 16dBm the power level before ADC?  What does the test condition 'IF = 1.5, 2MHz at -12 dBFs' mean. ? Does it mean the IIP2 is tested with two input tones?
  2. Out-band IIP2, what does the test condition 'IF = 10KHz at -10 dBm, 1.9MHz at -30 dBm' mean?

Thanks,
Adam

  • 0
    TI__Guru*** 147854 points

    Hi,

    The HW team will review this request and get back to you as soon as possible

    thank you

    Cesar

  • 0
    TI__Guru 58035 points

    Hello Adam,

    For IIP2 the second order distortion  is measured. We use tow input tones and (f1+f2) gives the second order distortion component. The -12dBfs and -10dBfs are the tone signal levels used for the measured, as seen by the ADC. dBFS is the db full scale of the ADC.

    The dBm level refers to the signal level at the LNA input. In case of OOB IIP2 we mentioned the input levels in dBm because the OOB signal (10Khz) would be highly attenuated by the HPF, so looking at the dBFS number would be problematic. 

    Regards,
    Vivek

  • 0 in reply to Vivek Dham
    TI__Genius 10910 points

    Hi Vivek,
        Thanks for your reply. I am not fully understand your answer. Could you help to check my below question?

    1. For In-band IIP2, the parameter in the datasheet is : IF=1.5,2MHz at -12 dBFS. However you said 'The -12dBfs and -10dBfs are the tone signal levels used for the measured, as seen by the ADC'.
      Do you mean the power is -12 dBFS for 1.5MHz and -10 dBFS fir 2MHz?
    2. For out-band IIP2, why we use one in-band 1.9MHz signal and one out-band signal 10KHz to generate IM signal?

    Thank you,
    Adam

  • 0 in reply to Adam Yao94020
    TI__Guru 58035 points

    Hello Adam,

    Please find my reply below:

    1. For In-band IIP2, the parameter in the datasheet is : IF=1.5,2MHz at -12 dBFS. However you said 'The -12dBfs and -10dBfs are the tone signal levels used for the measured, as seen by the ADC'.
      Do you mean the power is -12 dBFS for 1.5MHz and -10 dBFS fir 2MHz?<VD> That is correct
    2. For out-band IIP2, why we use one in-band 1.9MHz signal and one out-band signal 10KHz to generate IM signal?<VD> One is a inband signal (1.9Mhz) and other is and other is out off band (10Khz) . We are trying to see the non linearity due to the OOB signal like 10Khz.

    Regards,
    Vivek

  • 0 in reply to Vivek Dham
    TI__Genius 10910 points

    Hi Vivek,
        Got it, thanks for your reply.

    Best regards,
    Adam