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IWR6843AOP: How to calculate bandwidth chirp from configuration

Cruijff
Expert 2760 points
Part Number: IWR6843AOP

Hi community member,

I saw the configuration file for mmw_pplcount_demo_default.cfg
file:///C:/ti/mmwave_industrial_toolbox_4_4_1/chirps/People+Tracking+and+Counting+Application.html

I think a total bandwidth is 32768MHz like as a below calculation:

Ramp End Time (62 us) x Frequency slope (53 MHz / us) = 3286MHz

But, according to a parametor list, it is written a total Sweep Bandwidth is 2713.6MHz.

Please tell me how to calculate bandwidth from configuration in detail.

Best regards.
Cruijff

  • 0
    TI__Mastermind 40685 points

    HI, Cruijff:

    The total sweep bandwidth may be 3286MHz as you have calculated. But ramp time includes the extra ramp time and ADC start time.  So the valid sweep bandwidth is smaller.  The best way to calculate the valid sweep bandwidth would be using the number of ADC sample and ADC sampling time and the Frequency slope as:

    NumADCSamplePerChirp / ADCSamplingRate X Frequency Slope

    Best,

    Zigang