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Thread: Distance2GO continuous modulation (actual FMCW)

  1. #1
    New Member New Member unnabi is on a distinguished road
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    Distance2GO continuous modulation (actual FMCW)

    I was unable to modulate BGT transmitter in a true FMCW mode, a continuous triangular/sawtooth wave. I've looked at the output of PLL and it produces a single up chirp, then it turns off and 250 ms later it does another up chirp. I commented out BGT_DUTY_CYCLE in config.h, as Infineon engineer suggested but I'm still getting just a single ramp. How can I modify the code to put device in FMCW mode?

  2. #2
    Beginner Beginner radaruser is on a distinguished road
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    Which pin did you use to look at the PLL output?
    Aren't the 250 ms due to the FRAME_PERIOD_ms (also in config.h)?

  3. #3
    New Member New Member unnabi is on a distinguished road
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    Quote Originally Posted by radaruser View Post
    Which pin did you use to look at the PLL output?
    Aren't the 250 ms due to the FRAME_PERIOD_ms (also in config.h)?
    I looked at pins 4, 5 of BGT24MTR11, which is an output of PLL passed through loop filter.
    I tried changing FRAME_PERIOD_ms to 50 from 250 and it was set to 50 ms but still this is too slow, I want that to be 0 ms between ramps, or as close to that value as possible. However, the more I learn about BGT IC, the more it appears it's incapable of running FMCW due to heat.
    Last edited by unnabi; Oct 11th, 2018 at 09:01 AM.

  4. #4
    Beginner Beginner radaruser is on a distinguished road
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    Well I agree that a frame period of 50 ms is still too high compared to a chirp duration of 1,5 ms (or max 3 ms)...
    Maybe anyone else has an idea?

    Did you get the information about heat incapability from the BGTs datasheet?

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