Is there an App note available for AD9361 that justifies the choice of 12 bits @ 122.88MHz to meet LTE performance requirements? Would 12 bits be sufficient with DPD?
I don't think we have an application note, since LTE is a system level spec, and we don't provide the digital baseband part.
I can say that many people have implemented the AD9361 in User Equipment, up to LTE20, or used it in a Femtocell solution.
Since DPD is normally used on the basestation/eNB, I assume that isn't what you are interested in, however, some customers have implemented LTE5 with DPD in their systems (sometimes LTE, sometimes for other standards, like TV White space).
Femtocell - Wikipedia, the free encyclopedia
User equipment - Wikipedia, the free encyclopedia
EnodeB - Wikipedia, the free encyclopedia
LTE (telecommunication) - Wikipedia, the free encyclopedia
White spaces (radio) - Wikipedia, the free encyclopedia
eNodeB/Macro basestation implementation is the aplication of interest to me. If I understand your answer correctly, the chip has been used for commercial LTE eNodeB/basestation at 5MHz bandwidth. But for 20 MHz its only been used for Femtocell eNodeB.
We do not have a definitive answer whether the part would work in a LTE macro application. It depends on the system level specification. I would suggest familiarizing yourself with the performance data in the datasheet and evaluating the part using one of our AD9361/AD9364 evaluation platforms (AD-FMCOMMS2-5).
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