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CC2674P10: DTM test - internal bias / differential mode

Guillaume Henri
Expert 4376 points
Part Number: CC2674P10
Other Parts Discussed in Thread: SYSCONFIG

Tool/software:

Hi champs,

For CEM qualification of a CC2674 product, a DTM test is being held here – the HW configuration is based on internal bias / differential mode.

Un CCS project is used here (with no modification). The syscfg file is attached. The internal bias / differential mode is selected but when measuring the conducted emission, a -60dBm sensitivity is observed which seems to correspond to a wrong configuration of the bias (External)

BUT, when using smartRF studio, and when setting the biasMode register to ‘0’, the sensitivity is measured at -90dBm (see snapshots here below) as expected 

Could you tell what could be the issue here ? Why the internal bias / differential mode does not seem to be taken into account on the first measurement ?

Thank you!

Best regards,

Guillaume

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/538/1667.host_5F00_test.syscfg

  • 0
    TI__Expert 4390 points

    Hello Guillaume,

    Thank you for reaching out! We will take a look at your issue and get back to you ASAP. In the meantime, can you share how you're measuring the conducted emission?

    Best Regards,

    Tarek

  • 0 in reply to Tarek D
    Prodigy 10 points

    Hello,

    Conducted measurements are performed using a coax connected directly to the output of the CC2674P10 chip and a CMW270, which takes control via DTM mode.
    In a PER Search test, the CMW270 indicates around -60dBm, whereas we were expecting around -97dBm (result obtained on another design using a discrete balun with external bias). In our current design, we're using a Murata IPC balun and are supposed to activate the internal bias.

    Best Regards,

    Daniel 

  • 0 in reply to Daniel Kieffer
    TI__Mastermind 18215 points

    Hi Daniel,

    A couple of items that would be useful to rule out:

    • Are the DIOs used for control of the RFSW configured to be the same DIOs as in your SmartRF Studio 7 settings?
    • If you export the RF Studio 7 settings (which has the desired performance) and use them in your CCS project do you still see the reduced RX Sensitivity performance?

    Regards,

    Zack

  • 0 in reply to ZC
    Prodigy 20 points

    Hello,

    The C file which contains the radio config that was extracted from the smartRF studio is erased by the sysconfig file from our HostTest project.

    It seems like the internal bias config that we set up is being overwritten and not taken into account.

    BR,

    Gilles

  • 0 in reply to Gilles Banholzer
    TI__Mastermind 18215 points

    Hi Gilles,

    It sounds like this is more of a SW issue at this point if the SmartRF Studio 7 settings are not being read properly - I'll loop in a SW colleague.

    Regards,

    Zack

  • 0 in reply to Gilles Banholzer
    TI__Expert 4390 points

    Hi Gilles,

    So sorry for the delay on this! Please expect a response by EOD tomorrow (6-25)

    Best Regards,

    Tarek D

  • 0 in reply to Gilles Banholzer
    TI__Expert 4390 points

    Hello Gilles,

    Thank you for your patience. One way to ensure that  the file is not overwritten is by exluding the sysconfig generated file from the build. To do this, go to syscfg and exclude the undesired file from the build by unselecting it. Please check screenshot below.

    I hope this helps!

    Best Regards,

    Tarek D