Because of the Thanksgiving holiday in the U.S., TI E2E™ design support forum responses may be delayed from November 25 through December 2. Thank you for your patience.

  • State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 53 subscribers
  • Views 655 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

CC1310 + CC1190 Reference Design poor performance

SpartanEngineer
Intellectual 555 points
Other Parts Discussed in Thread: CC1190, CC1310, TRF37C73We used the CC1310 LP to get a rough measurement on our uncalibrated, probably broken spectrum analyzer. With a custom CC1310+CC1190 board (largely based on a preliminary design, LAUNCHXL_CC1310_CC1190_1_0_1.zip, you had posted back in 2016) we get a difference of maybe 2 dB. The output from the CC1310 is 0 dBm and the PA is set to HGM=0, so we had expected maybe 24 dBm, especially since the custom board is drawing much more current.

As I stated before, we don't have proper equipment for accurate measurements, but we did a walk-test and the two boards transmit roughly the same in a line-of-sight test. For sanity check, we also tried a www.ti.com/.../trf37c73.pdf to amplify the CC1310 signal and the spectrum analyzer shows around 18 dB gain and the walk-test was more than triple the distance before running beyond line-of-sight.
  • 0
    TI__Guru**** 317180 points
    I split the thread since it's about a different board. Here, I would suspect that the performance is largely dependent on how the custom board was implemented. Without more details it's not possible to comment further on why you saw lower than expected performance.
  • 0 in reply to TER
    TI__Guru**** 317180 points

    Since this is about a different board I reply in this thread:

    The question was:

    Not sure if I should start a new thread, for now I'll add this data here.

    We have tested three setups: 1) Launchpad, 2) Custom CC1310+CC1190, 3) Launchpad + RF Gain TRF37C73

    With the CC1310 set to 0 dBm and the PA with HGM=0, we have peak supply currents (3.3 V) of 7.6 mA, 59.4 mA, and 61.9 mA, respectively. Doing an indoor walk test has options 2) slightly worse than 1), and 3) is more than triple the distance of either. We borrowed a spectrum analyzer to get the following measurements (there is a 20 dB attenuator on the input).

    ----

    Looking at the pictures: How have you measured this? Did you use CW or packets on the transmitter side? It looks like you could be sending packets/ modulated signal and just capturing part of the transmitted power. Try to send a CW.

    The latest plot using the TRF looks like you are sending a CW.

  • 0 in reply to TER
    Intellectual 555 points

    Measurement was done by taking our development boards and swapping the location of a zero-ohm resistor to send the RF signal to an SMA port instead of the antenna. The SMA port was connected to a SSA3000X from Siglent through a DC block and 20 dB attenuator. All transmission plots (including the TRF) consists of packets, and the Siglent was setup to trigger on signals greater than -80 dBm. I will report back when I have a chance to rerun this test with CW transmission.