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AWR1243: FMCW chirp non-linearity specification and performance results

Jonathan Jones2
Intellectual 680 points
Part Number: AWR1243


Dear Sir/Madame,

Could you please let me know the specification of the FMCW chirp non-linearity on the AWR1243? 

Specifically what is the peak and rms frequency deviation from a linear chirp over a 4GHz chirp. 

Is there a characteristic shape to the non-linearity e.g. sinusoidal and if so what are the parameters of this characteristic e.g sinusoid frequency, peak deviation?

Also could you share any any evaluation results you have for chirp non-linearity on the AWR1243?

Yours faithfully

Jonathan Jones

  • 0
    TI__Guru**** 150594 points
    Hi,

    Please check first the information we provide in the datasheet.

    We are looking for more information available internally and will get back to you

    thank you
    Cesar
  • 0 in reply to Cesar
    Intellectual 680 points

    Hi Cesar

    Thank you for your quick reply.

    Unfortunately there is no information in the AWR1243 datasheet on chirp linearity.

    Well please let me know when you have managed to find the data internally.

    I appreciate your help with this.

    Best regards

    Jonathan

  • 0 in reply to Jonathan Jones2
    Intellectual 680 points
    Hi Cesar

    Could you let me know what the status is on this question and when you will be able to provide an answer?

    Best regards

    Jonathan
  • 0 in reply to Jonathan Jones2
    TI__Guru 58035 points
    Hello Jonathan,
    You can refer to the following thread which has the linearity information : e2e.ti.com/.../600642

    Regards,
    Vivek
  • 0 in reply to Vivek Dham
    Intellectual 680 points
    Hello Vivek,

    Thank you for getting back to me on this issue. I understand that the maximum frequency error is +/-0.01%.
    However do you have any information on the characteristic of the non-linearity across the duration of the chirp.
    So is the frequency error a fixed frequency error across the the chirp or does it vary in some systematic way e.g a linear slope or sinusoidal function as a function of position in the chirp. Or is the frequency error random across the chirp and therefore characterised by a probability distribution. If you could let me know what this characteristic is that would be helpful.
    Also do you have any evaluation results that show frequency error across the chirp (frequency error on y-axis and chirp time on x-axis)?

    I appreciate your help with this.

    Best regards

    Jonathan
  • 0 in reply to Jonathan Jones2
    TI__Guru**** 150594 points
    Hi,

    We do not have any more information regarding the characteristic of the non-linearity across the duration of the chirp.

    Based on our measurements it is random but chirp profile dependent. You would have to perform measurements on your system.

    I will close this thread

    If there are new questions please start a new thread

    thank you
    cesar