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CC1310: LNA for CC1310

Rajat Jain
Prodigy 65 points
Part Number: CC1310
Other Parts Discussed in Thread: CC1190,

We are looking for a suitable LNA to get gain of 10DBm. Suggested LNA is CC1190 but since 8 months we been trying to procure however we not getting stock. We wanted to try skylab or any other LNA which is compatible with CC1310 and looking for reference design. We are operating on 867Mhz. Kindly assist

  • 0
    TI__Mastermind 18175 points

    Hi,

    If the FEM/discrete LNA you intend to use has single-ended input/outputs require 50 Ohms at the FEM input(s), then the following approach is recommended:

    • Choose a front-end module (or discrete LNA) that meets your required specification. For example, Skyworks produce several FEMs that
      1. Require 50 Ohms for the FEM input/output impedances
      2. Reduce the component count compared to a discrete LNA
    • If you can use an IPC (Integrated Passive Component) for the CC1310 matching network, then you could to combine the PA in and LNA outputs into a 50 Ohm point (i.e. the output of the IPC), which is done in the LAUNCHXL-CC1310-CC1190 (SWRC338) reference design: https://www.ti.com/lit/zip/swrc338
    • Otherwise, you would need to use a single-ended design for the CC1310 (separate RX/TX paths). Please see Page 9 of 

      SWRA640F (CC13xx/CC26xx Hardware Configuration and PCB Design Considerations (Rev F)): https://www.ti.com/lit/swra640

      for information on single-ended matching networks (separate RX/TX paths). If you present the required impedances to both the RF pins of the CC1310 and the input of the FEM, i.e. present the optimum impedances to the CC1310 and transform to 50 Ohms at the FEM input, then the devices will work as inteded.
    • As recommended in this thread: https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz-group/sub-1-ghz/f/sub-1-ghz-forum/624019/cc1350-design-reference-with-skywork-65364-21 if using a single-ended design then we recommend adding a SAW filter between the CC1310 and the FEM if you do plan to use the TX operation of an FEM (although this may not be required if you are only interested in the LNA).

    If you don't use a module (discrete LNA or FEM) that requires 50 Ohms at the input then you would need to design your own matching network based on the requirements of that module. Target impedances for the CC1310 can also be found in SWRA640F if this is requried. 

    The rest of the design (DCDC, XTALs, ect.) can be used from existing reference designs, such as the

    LAUNCHXL-CC1310 (SWRC319): https://www.ti.com/lit/zip/swrc319

    Regards,

    Zack