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AWR1843: How to find the frame period

yousuke nasu
Intellectual 880 points
Part Number: AWR1843

How is the frame period determined?

  • 0
    TI__Mastermind 31680 points

    Hello Yousuke,

    Frame periodicity depends on the chirp period (active ramp time and idle chirp time), number of chirps and frame idle time : 

    Hence by calculation, Frame periodicity =  [(chirp_ramp_time + chirp_idle_time) * (chirp_end_idx - chirp_start_idx + 1) * numOfLoop + idle_frame_time].

    To understand these terms, please refer to the below application note : 

    https://www.ti.com/lit/an/swra553a/swra553a.pdf 

    Regards,

    Ishita

  • 0 in reply to Ishita Kochar
    Intellectual 880 points

    How is idle_frame_time determined?

  • 0 in reply to yousuke nasu
    TI__Mastermind 31680 points

    Hello Yousuke, 

    Frame Idle time depends on the duty cycle you want while transmitting functional chirps. Duty cycle is a ratio of the Active Chirping time to the total frame time. 

    Frame periodicity =  [(chirp_ramp_time + chirp_idle_time) * (chirp_end_idx - chirp_start_idx + 1) * numOfLoop + idle_frame_time].

    The bold items in the above formula are the configurable parameters in the device. Hence you can decide the frame period according to the Frame idle time you want. 

    Say for example, based on the your chirp configurability, the active chirp time is 25ms and you want 50% duty cycle, you will configure the Frame period to be 50ms in this case, which leaves you with 25ms of Frame Idle time. It ultimately depends on your usecase.  

    Hope this makes sense. 

    Regards,

    Ishita