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IWR1443: The calibration function of IWR1443

Kuerbis
Expert 4145 points
Part Number: IWR1443


Hi Team,

 

I have few questions for the calibration function of IWR1443.

 

Q1. The RX gain

RX Gain control for temperature variation described at section 5.5.13 Sub block 0x010C – AWR_RX_GAIN_TEMPLUT_SET_SB In the attached document AWR1xxx Radar Interface Control Document

Based on the description,

Is it OK to recognize that there is a variation of min-14dB(=-6-8) to max28dB(= 28-0)?

 

Q2. The TX gain

TX Gain control for temperature variation described at section 5.5.14 Sub block 0x010D – AWR_TX_GAIN_TEMPLUT_SET_SB In the attached document AWR1xxx Radar Interface Control Document

 

STG_CODE is defined Higher values for higher gain.

What are the values for min and max for TX gain?

 

As shown in Figure 2 of the attached document "Self-Calibration in TI’s mmWave Radar Devices"

 

Q3. RX Gain and TX Power With Calibration

Do you have the actual values that can be suppressed (RX +/- 1.9 dB, TX +/- 1.0 dB in Figure 2) when adjusting the temperature compensation for RX gain and TX and power as shown in Figure 2 of the attached Self-Calibration in TI’s mmWave Radar Devices?

Or is there a guaranteed value for the amount of change that can be suppressed?

 

Thanks and Best regards,

Kuerbis

  • 0
    TI__Mastermind 33805 points

    Hi,

    Need to check with the team internally and get back to you.

    Regards,

    Charles O

  • 0
    TI__Mastermind 33805 points

    Kuerbis said:
    Is it OK to recognize that there is a variation of min-14dB(=-6-8) to max28dB(= 28-0)?

    The RX gain steps has a total dynamic range of ~43dB. It is uncalibrated and the Set Rx gain temp lut API is not supported

    Kuerbis said:
    What are the values for min and max for TX gain?

    There is a typical dynamic range of 37.8dB. This is also uncalibrated and Set Tx gain temp lut API is not supported. 

    Kuerbis said:
    Do you have the actual values that can be suppressed (RX +/- 1.9 dB, TX +/- 1.0 dB in Figure 2) when adjusting the temperature compensation for RX gain and TX and power as shown in Figure 2 of the attached Self-Calibration in TI’s mmWave Radar Devices?

    • Rx gain: -2.5dB to 4dB wrt the value at room temperature
    • Tx output power: -2 to +2dB wrt the value at room temperature

    Regards,

    Charles O

  • 0 in reply to Charles Oladimeji
    TI__Expert 4145 points

    Hi Charles O

     

    Thank you for your reply.

     

    For RX gain and TX gain, What do you mean set Rx/TX gain temp lut API is not supported?

    Is it not supported on IWR1443?

     

    Thanks and Best regards,

    Kuerbis

  • 0 in reply to Kuerbis
    TI__Mastermind 33805 points

    Yes, the API is currently not supported on the device

  • 0 in reply to Charles Oladimeji
    TI__Expert 4145 points

    Hi Charles O

     

    Thank you for your reply.

     

    Q1, The API is currently not supported on IWR1443. Does it means that IWR1443 has a feature and it could be configured, but not guaranteed to work? Or doesn't have the capability itself?

     

    Q2. Do you have any device which the API is supported?

    Is it a pin compatible with IWR1443?

     

    Q3. Regarding to Self-Calibration, We want to know whether the value provided below could be considered as the guarantee value (that is, it falls within this value) for IWR1443 and other..

    •Rx gain: -2.5dB to 4dB wrt the value at room temperature

    •Tx output power: -2 to +2dB wrt the value at room temperature

     

    Thanks and Best regards,

    Kuerbis

  • 0 in reply to Kuerbis
    TI__Mastermind 33805 points

    Hi,

    I will get back to you in a day or 2.

    Regards,

    Charles O

  • 0 in reply to Kuerbis
    TI__Mastermind 33805 points

    Kuerbis said:
    Q1, The API is currently not supported on IWR1443. Does it means that IWR1443 has a feature and it could be configured, but not guaranteed to work? Or doesn't have the capability itself?

    it means modifying the value is not recommended and will nullify the self calibration, the LUT is uncalibrated and don't have fixed steps

    Kuerbis said:
    Q2. Do you have any device which the API is supported?

    No, this is not supported across devices 

    Kuerbis said:
    Q3. Regarding to Self-Calibration, We want to know whether the value provided below could be considered as the guarantee value (that is, it falls within this value) for IWR1443 and other..

    No it is not. The error numbers are based on lab characterization on few parts across temperature and split corners. also the +/-2dB Tx power accuracy is true only for 0dB BO case. For non-0 BO cases, it is +/- 3dB. 

    Regards,

    Charles O

  • 0 in reply to Charles Oladimeji
    TI__Expert 4145 points

    Hi Charles O

     

    Thanks!

     

    Thanks and Best regards,

    Kuerbis