SPRACF4C June   2018  – January 2023 AWR1243 , AWR1443 , AWR1642 , AWR1843 , AWR1843AOP , AWR2243 , AWR2944 , AWR6843 , AWR6843AOP , IWR1843 , IWR6443 , IWR6843 , IWR6843AOP

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Purpose of Calibrations
    2. 1.2 Purpose of Monitoring Mechanisms
  3. 2Hardware Infrastructure to Support Calibration and Monitoring
  4. 3List of Calibrations
    1. 3.1  APLL Calibration
    2. 3.2  Synthesizer VCO Calibration
    3. 3.3  LO Distribution Calibration
    4. 3.4  ADC DC Offset Calibration
    5. 3.5  HPF Cutoff Calibration
    6. 3.6  LPF Cutoff Calibration
    7. 3.7  Peak Detector Calibration
    8. 3.8  TX Power Calibration
    9. 3.9  RX Gain Calibration
    10. 3.10 IQ Mismatch Calibration
    11. 3.11 TX Phase Shifter Calibration
  5. 4Impact of Calibration on Gain and Phase
  6. 5Impact of Interference on the Calibrations and Emissions Caused Due to Calibrations
  7. 6Scheduling of Runtime Calibration and Monitoring
    1. 6.1 Selection of CALIB_MON_TIME_UNIT
    2. 6.2 Selection of CALIBRATION_PERIODICITY
    3. 6.3 Application-Controlled One Time Calibration
  8. 7Software Controllability of Calibration
    1. 7.1  Calibration and Monitoring Frequency Limits
    2. 7.2  Calibration and Monitoring TX Frequency and Power Limit
    3. 7.3  Calibration Status Reports
      1. 7.3.1 RF Initialization Calibration Completion
      2. 7.3.2 Runtime Calibration Status Report
      3. 7.3.3 Calibration/Monitoring Timing Failure Status Report
    4. 7.4  Programming CAL_MON_TIME_UNIT
    5. 7.5  Calibration Periodicity
    6. 7.6  RF Initialization Calibration
    7. 7.7  Runtime Calibration
    8. 7.8  Overriding the TX Power Calibration LUT
    9. 7.9  Overriding the RX Gain Calibration LUT
    10. 7.10 Retrieving and Restoring Calibration Data
  9. 8References
  10.   A Calibration and Monitoring Durations
    1.     A.1 Duration of Boot Time Calibrations
  11.   Revision History

6.3 Application-Controlled One Time Calibration

In scenarios where the user does not want the periodic calibrations to be automatically triggered by the device firmware, the application can use the ONE TIME CALIBRATION feature where it can control the instance at which the calibration must be performed and the value of the gain change. The application can use the internal temperature sensor readings to trigger the one time calibrations OR could trigger it always before starting the radar measurement if the measurement cycle is expected to be short and no significant temperature change is expected during the measurement. When the one time calibration mode is triggered, the calibration of various RF/analog aspects are triggered based on the configured bits of in the "ONE_TIME_CALIB_ENABLE_MASK" field. The response is in the form of an asynchronous event. The calibrations, if enabled, are performed after the completion of any ongoing FTTI cycle, and the calibration results take effect from the next FTTI.
The ONE TIME CALIBRATIONS can be used in two ways:
  1. ONE TIME CALIBRATION without temp index over ride; In this mode, when the application triggers the one time calibration, the firmware measures the internal temperature and sets the gain index based on the measured temperature. The application has control on the timing of the calibration but not the exact gain setting that the firmware picks.
  2. ONE TIME CALIBRATION with temp index over ride: This mode is available in the xWR2243 device. In this mode, along with controlling the time of calibration, the application also selects the gain index to be picked by the firmware irrespective of the internal temperature reading. This way the application have full control on the gain changes. This mode is typically required only in cascade environment to ensure the gain and phase mismatch across the channels of multiple devices changes in a predictable manner.