AD9375 DPD min/max bandwidth

Hi,

Regarding on AD9375 DPD application, the linearization signal BW is up to 40MHz.

What is the mininum bandwidth? Can it go below 250kHz BW?

If my application is 100MHz BW, can I still able to use the DPD? If yes, how will it go? Any application note regarding to DPD implementation?

Thank you.

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  • We have seen AD9375 DPD work well for 100MHz signal BW no problem. Both on Skyworks PA and RFHIC GaN. Try the frequency tuning feature in the DPD GUI to optimize it.  Correction goes only out about 75MHz on either side and you still might need a TX filter for spectral regrowth.

    For narrowband we find it helps to offset the carrier from the LO a little bit (don't center).  

  • Hi,

    We are looking for an application where the signal BW will vary from 25kHz to 5MHz.

    For single carrier application it will be 25kHz and the multi-carrier signal BW can go upto maximum of 5MHz.

    Most of the characterization for AD9375 is for wideband signals. 

    I doubt whether I can achieve and ACPR performance of better than 60dBc for 25kHz BW. The PA output ACPR (Without DPD) is 40dBc.

    Regards,

    Vishnu R.

Reply
  • Hi,

    We are looking for an application where the signal BW will vary from 25kHz to 5MHz.

    For single carrier application it will be 25kHz and the multi-carrier signal BW can go upto maximum of 5MHz.

    Most of the characterization for AD9375 is for wideband signals. 

    I doubt whether I can achieve and ACPR performance of better than 60dBc for 25kHz BW. The PA output ACPR (Without DPD) is 40dBc.

    Regards,

    Vishnu R.

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