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AWR2944: Chip sampling rate adjustment

Arie Rudnitsky
Intellectual 330 points
Part Number: AWR2944

Tool/software:

Hi,

in 2944 datasheets it is written that the chip sampling rate is fixed with 37.5MHz. In my case the beat frequency doesn't go above 4MHz, so basically I can deal with much lower Fsamp.

Is there a way to resample the data before entering range FFT or to adjust the sampling frequency?

Cheers,

Arie

  • 0
    TI__Expert 3490 points

    Hello,

    The ADC sampling rate is not fixed at 37.5 Msps, it's max sampling rate is 37.5 Msps. What do you mean by beat frequency? But yes, you can change the sampling frequency in the .cfg file that you load onto the board.

    The following is an example configuration. The ADC sampling rate is 13,349(ksps) in this example. You can change it as long as you do not go over the max sampling rate.

    Best,

    Gabriel

  • 0 in reply to Gabriel Gigliotti
    Intellectual 330 points

    Fbeat is a maximal frequency shift that is generated by objects in my radar setup, this actually defines me the sampling frequency that I need. Is "the sample rate option" in SensorConfig widget of mmWave Studio actually responsible for definition of the sampling rate?

  • 0 in reply to Arie Rudnitsky
    Intellectual 330 points

    And another related question: if I can adjust the sampling rate, in order to get use of the subsequent SNR improvement, I need to adjust the antialiasing filter appropriately, otherwise the noise floor doesn't change. Is there any way to control anti-aliasing filter BW? What is its BW currently?

  • 0 in reply to Arie Rudnitsky
    TI__Expert 3490 points

    Hello,

    It was my understanding that you were loading the config via UART. Yes, the sample rate option would control the sampling rate. I believe that by changing the sampling rate you can control the anti-aliasing filter BW. There is more context provided in the ICD present here.

    C:/ti/mmwave_mcuplus_sdk_04_07_00_01/mmwave_dfp_02_04_17_00/docs/mmWave-Radar-Interface-Control.pdf

    Best,

    Gabriel