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CC2642R: The loss of TX power is too large

Part Number: CC2642R

Hi Team,

       My customer uesd cc2642 in their product .But they found the loss of Tx power is too large(set the device output 5dbm and the frequency spectrograph just received 3dbm ) . Can you give some suggestions to improve the tx power.

       Ps.

       1.The TX power test point is in test point A and has remove the pi-filter circuit or antenna match circui .it can exclude that the loss power is caused by neither pi-filter circuit or antenna match circuit
 

       2. The circuit of diffenenct to single is the same as TI reference design.

       3.The following picture is their sch and pcb 

        
 

  • Hi,

    Someone from our HW team will get back to you as soon as possible.

    Regards

  • Hi,

    Did they calibrate the test setup? Did they account for test Cable Loss?

    What is the Vdd level they used?

    From the pics, their Schematic and PCB Layout looks OK.

    Thanks,

    PM

  • Hi PM ,

             Thank you for your quick reply . 

             The test software is Smartrf studio and they set the txpower is 5dbm. The cable loss is 0.5dbm wihch has been considered and the real peak power loss is 2dbm.

              The following is the test step. 

              Concect the cable to the test-A point . Meanwhile , Remove the PI-filter circuit and antenna match circuit . Then powerd the cc2642 and open the smartrf studio to test the peak power.

               The following picture is the test picture 

              

                 Besides , customer has also let the cable connect the CC2642 in the end of antenna match circuit. And the peak power is the same as the previous test(The loss is also 2dbm). The following picture is the test picture 

               

  • Hi,

    Thanks for all the detailed Pictures. It looks their connection is OK.

    Did they really measure the test cable loss or they took into from the data sheet? Some of the Cables have more loss.

    What is the equipment they are using for Power measurement? Is it a Spectrum Analyzer or Power Meter?

    Would it be possible for them to do the same measurement on our Launchpad for comparison?

    Thanks,

    PM