SWRA820B May   2024  – November 2024 IWRL6432AOP

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Increased Receiver Noise Figure
  6. 3Risk of Receiver ADC Saturation
  7. 4TX Backoff and RX Gain Recommendations
  8. 5Chirp Configuration Recommendations Using Sensing Estimator
  9. 6Summary
  10. 7References
  11. 8Revision History

4 TX Backoff and RX Gain Recommendations

Figure 4-1 and Figure 4-2 give the maximum allowed RX gain setting and minimum TX back off restrictions based on chirp slope (X-axis) and HPF setting (different colors). These are recommendations which minimize the effects of increased receiver noise figure and risk of receiver ADC saturation.
IWRL6432AOP, AWRL6432AOP Maximum Allowed RX Gain Setting Figure 4-1 Maximum Allowed RX Gain Setting
IWRL6432AOP, AWRL6432AOP Minimum TX Backoff for 57 to 64GHz Figure 4-2 Minimum TX Backoff for 57 to 64GHz

TX backoff restriction can be relaxed as shown in Figure 4-3 for the following cases:

  • Chirps contained within 61 to 64GHz for two TX applications
  • Chirps contained within 59 to 64GHz for single TX applications (using TX2)
IWRL6432AOP, AWRL6432AOP Minimum TX Backoff for 61 to 64GHz Figure 4-3 Minimum TX Backoff for 61 to 64GHz
Using the previously-shown constraints makes sure that the best possible SNR is achieved and also the receiver ADC is not saturated.