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CC1101: Generate pure tone sine wave using CC1101

Hasan Mahmood
Prodigy 120 points
Part Number: CC1101

I want to produce a pure unmodulated carrier wave through CC1101 (Just a pure sine wave). How can I do that ? I am using CC1101 on a customized board. 

  • 0 in reply to TER
    Prodigy 120 points
    I did follow that thread before I posted here. I used evaluation boards of CC1101 for testing. I chose the generic register settings for 915 Mhz, and selected continuous Tx and ticked on unmodulated. I am checking signals via a RF spectrum analyzer, and it is showing a signal with bandwidth of about 70 Khz. When I ticked on modulated instead of unmodulated, the signal BW remained the same. Shouldn't CW have a very narrow BW ? There might be something I am missing, could you share with me the register settings to use with the evaluation board for CW generation.

    Thank You
  • 0 in reply to Hasan Mahmood
    TI__Guru**** 317180 points
    That would depend on which RBW you are using on the spectrum.

    Also, did you select random when you used modulated?
  • 0 in reply to TER
    Prodigy 120 points
    RBW ? That stands for receiver Bandwidth ?
    And on which spectrum, I am sorry I don't follow.
    A CW should just be a pure-tone sine wave right ? Showing just a really narrow peak on the spectrum.

    No. I am using synchronous serial mode in both modulated and unmodulated waves
  • 0 in reply to Hasan Mahmood
    TI__Guru**** 317180 points
    RBW: Receiver bandwidth. The spectrum analyzers I have used have a menu option where you set thi. If the RBW is set to 1 MHz the spectrum will look much wider than if you set RBW equal to 3 kHz. Please use some time to understand how to set up the spectrum. (Btw, when I mean spectrum I mean RF spectrum analyzer)

    If you use synchronous serial mode when you select modulated, you will most likely also send a tone (CW) since you don't set the input pin. Use random mode if you want to look at a modulated signal.