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CC1310: Inquiry on reference design for 940MHz based on CC1310 and CC1190

JAEWON CHUNG
Intellectual 255 points
Part Number: CC1310
Other Parts Discussed in Thread: CC1190, LAUNCHXL-CC13-90

Hello,

Last year, 940MHz frequency band was newly added to Korean RF regulation for the purpose of promoting IOT industries.

(940.2MHz ~ 944.2MHz)

The maximum output power in 940MHz band is 200mW in EIRP (23dBm e.i.r.p.)

And I am looking into SWRA517 application note in which CC1190 FEM is designed based on CC1310.

I am not pretty sure if the reference design works well with 940MHz.

At a glance the saw filter looks to be replaced by suitable one.

Your advisement would be thankful.

 

Regards/Jaewon

  • 0
    TI__Guru**** 317180 points

    We have only tested the 915 MHz band for this design. What you can do is to get a https://www.ti.com/tool/LAUNCHXL-CC13-90  and use a 0 ohm resistor for the SAW filter and do some measurements. I suspect that the design should be tuned some to give a better performance.

    Is the Korean regulations closer to ETSI or FCC (in other words, what is the requirement for the 2. and 3. harmonic.) 

  • 0
    Intellectual 255 points

    The Korean regulation only defines maximum spurious emission level for devices using 940MHz frequency band

    as seen in below table.

    As you remarked, I will be measuring RF performance using LAUNCHXL-CC13-90.

    Before that, let me ask you some questions.

    1) Is the matching circuitry between CC1190 and antenna connector in swra517 considered for 940MHz frequency band? 

    2) Do you have a plan for testing the 940MHz band? 

  • 0 in reply to JAEWON CHUNG
    TI__Guru**** 317180 points

    The regulation seems to be inspired by EU rules. The EU LP is designed to give best performance for EU rules but the LP has a couple of notches to suppress the 2. harmonic of 869.5 MHz. To be used on 940 MHz the component values for the notches has to be adjusted accordingly. 

    1: We have not considered or tested 940 MHz for this design. It could be that the only change that has to be made is to adjust the notch frequency since you only need 23 dBm out. 

    2: No. We have not seen any demand for this frequency hence we haven't done any work here. This could be added to the todo list if the volumes are interesting. 

  • 0 in reply to TER
    Intellectual 255 points

    In the frequency range above 930MHz, only 13dBm is available in the tx power menu in SmartRF Studio7. I would like to set tx power up to 26dBm with LP13-90 using SmartRF Studio7 software. Can you advise me?

       

  • 0 in reply to JAEWON CHUNG
    TI__Guru**** 317180 points

    - Select the correct Launchpad in the "RF Design Based on" drop down.

    - Set the frequency to 915 MHz

    - Set the wanted power level

    - Note the value set in the CMD_PROP_RADIO_DIV_SETUP.txPower field in the right end pan.

    - Set the frequency to 914 MHz

    -  Double click on the value set in the CMD_PROP_RADIO_DIV_SETUP.txPower field and write in the value you found for 915 MHz

    Don't worry that you get tx power unknown, it's the value of .txPower that set the power used.