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BOOSTXL-CC1120-90: The conduction output power of CC1120-CC1190 BoosterPack is much lower than the datasheet

shi shi
Prodigy 10 points
Part Number: BOOSTXL-CC1120-90
Other Parts Discussed in Thread: CC1190, CC1120

Tool/software:

 I use RF Studio to measure the conduct RF power of the CC1120-CC1190 BoosterPack and find that the max conducted power is about 22 dBm, which is much lower 26 dBm which is stated in the datasheet. The test point is shown in the following figure, remove C40 and weld coaxial cable.

RF Studio is set as follows, with IOCXG0 register value of 0x73（ CC1190 PA_EN）

Then I tested the output power of CC1120, with the following test point，remove B39921B3588U410 and weld coaxial cable. When the register PA_POWER_RAMP is set to 0x37, the measured power is -0.2 dBm. Could it be that the CC1120 chip on this board is broken? What is the expected output power of this testing point when PA_POWER_RAMP is set to 0x37?

       

  • 0
    TI__Mastermind 34960 points

    Hello,

    Currently the device experts are on break, but we will get back to you as soon as possible.

    Thanks,
    Toby

  • 0
    TI__Genius 17945 points

    Hi,

    For some initial checks, are you configuring the jumpers on the BoosterPack as described in Section 7 of SWRA492 (CC1120-CC1190 BoosterPack): https://www.ti.com/lit/swra492 to directly control the BoosterPack using SmartRF Studio 7?

    In your top SmartRF Studio 7 screenshot (with the CC1190 range extender selected), the TX Power configuration is still at +14 dBm; to double-check, did you also test with the maximum output power setting of +27 dBm?

    From SWRA492, the RF performance should be similar to the performance detailed in SWRA387 (Using the CC1190 Front End with CC112x and CC120x under FCC 15.247): https://www.ti.com/lit/swra387

    An input power to the CC1190 of ~0 dBm should produce greater than +22 dBm output power (at the SMA output after amplification); you can confirm this in Figure 6 of the CC1190 Datasheet: https://www.ti.com/lit/swrs089 

    So, please first confirm that the jumper settings are correct.

    Regards,

    Zack