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AWR1642: About P1dB value

Atsu
Prodigy 140 points
Part Number: AWR1642

Hi,

Could you please clarify the difference between receiever 1-dB compression and in-band P1dB on P.30 of the datasheet(SWRS203-May 2017) ?

Thank you in advance.

Atsu

  • 0
    TI__Guru 58035 points
    Hello Atsu,
    The inband compression is related to the inband signal (within the desired IF bandwidth and outside the HPF filter bandwidth) going beyond the ADC signal range (reaching the max code words). The P1dB compression point is related to front end saturation in the RX chain, which would be typically seen in a very strong out of band signal. The out of band signal would get filtered out at the ADC but the LNA would still see it and can get saturated with very strong signals (> -5dBm).

    Regards,
    Vivek
  • 0 in reply to Vivek Dham
    Prodigy 140 points
    Hi Vivek,
    Thanks.
    Then,would you let me know if i can bypass LNA for very close target?

    Best regards,
    Atsu
  • 0 in reply to Atsu
    TI__Guru 58035 points
    Hello Atsu,
    LNA cannot be bypassed , but you can reduce the gain to as low as 24dB. Since the LNA can take upto -5dBm input level , you would not have an issue with very close objects also.
    You can also adjust the HPF cutoff frequency to prevent ADC saturation.

    Regards,
    Vivek
  • 0 in reply to Vivek Dham
    Prodigy 140 points
    Thanks, Vivek-san.

    I will try it.

    Atsu