GSM RX out-band attenuation issue

[Wilson_yu_chen]

Hi Guys,


My PCB is using Qualcomm 8K platform with RTR6285 and Murata front-end module instead of reference design-Sony antenna switch module + EPCOS SAW filters.


My selected module has measured EVB out-band attenuation (close to in-band and high side for DCS/PCS bands, less than 2GHz) low/off spec of EPCOS SAW filter minimum attenuation, which is more than 3dB.

I wander it not counts more on noise but on LNA/RX chain linearity where I have no idea about which part, switch module IP2 or LNA linearity, take more important role.

Please kindly give comment what should I check next or do next from your experience??

Thanks
Wilson

 

[kspalla]

Clarity is missing, unable to understand the application and requirement.