SLYT836 March   2023 IWR6443 , IWR6843 , IWR6843AOP

 

  1. 1 Introduction
  2. 2 The importance of integration
  3. 3 FMCW
  4. 4 Chirps
  5. 5 Mixer
  6. 6 FFT and peak detection
  7. 7 Beamsteering, in the direction that you want to sense
  8. 8 Calibration
  9. 9 Conclusion
  10. 10Related Websites

8 Calibration

To maintain performance across voltage and temperature variations, TI mmWave radar devices support boot-time calibrations at the RF initialization phase (calling the RfInit() application programming interface) as well as during runtime (during application execution). Figure 8-1 illustrates an example ordering of calibration types, which can include:

  • Analog phase-locked loop calibration.
  • Synthesizer VCO.
  • Local oscillation distribution calibration.
  • ADC DC offset.
  • IF amplifier high- and low-pass cutoff frequencies.
  • Peak detector.
  • Transmit and receive gains.
  • Quiescent current mismatch.
  • Transmit phase shifters.


Figure 8-1 Timing sequence of functional chirping, monitoring and calibration.

Figure 8-2 illustrates some of the integration in the RF front end for calibration of transmit, and receive analog front-end parameters. Along with power detectors for the PA outputs and LNA inputs, in combination with loopback paths, it is possible to continually monitor and compensate the complete front end.


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Figure 8-2 Overview of the diagnostics and monitoring included in the IWR6843.