SWRZ162 May   2024 IWR2944

 

  1.   1
  2. 1Introduction
  3. 2Device Nomenclature
  4. 3Device Markings
  5. 4Advisory to Silicon Variant / Revision Map
  6. 5Known Design Exceptions to Functional Specifications
    1.     MSS#25
    2.     MSS#27
    3.     MSS#28
    4.     MSS#29
    5.     MSS#30
    6.     MSS#33
    7.     MSS#40
    8. 5.1  MSS#46
    9. 5.2  MSS#48
    10. 5.3  MSS#49
    11. 5.4  MSS#52
    12. 5.5  MSS#53
    13. 5.6  MSS#54
    14. 5.7  MSS#55
    15. 5.8  MSS#56
    16. 5.9  MSS#57
    17. 5.10 MSS#58
    18. 5.11 MSS#59
    19. 5.12 MSS#60
    20. 5.13 MSS#61
    21. 5.14 MSS#62
    22. 5.15 ANA#12A
    23.     ANA#32A
    24.     ANA#33A
    25.     ANA#34A
    26.     ANA#35A
    27.     ANA#36
    28.     ANA#37A
    29.     ANA#38A
    30.     ANA#39
    31.     ANA#43
    32.     ANA#44
    33.     ANA#45
    34.     ANA#46
    35.     ANA#47
  7.   Trademarks
  8. 6Revision History

ANA#47

RX Spurs observed across RXs in Idle Channel Scenario

Revision(s) Affected:

IWR2944 ES1.0, ES2.0

Description:

In scenarios of no object being present, or a very weak object being present in the vicinity, the sigma delta ADC output could have spurs in the RX spectrum. This is observed only for low RX gain settings. The spur frequency could vary across RX channels. In presence of a real object, this would not be observed.

Workaround(s):

  • Workaround#1 : Use higher rx gain (>40dB) in these situations.
  • Workaround#2 : Idle channel spur is spread across all doppler bins in 2DFFT at the spur range bin. While detecting peaks in 2D-FFT, users can apply 2D neighborhood peak search (e.g. 2D CFAR-CA), which compares the level with all surrounding bins. This can help avoid detection of idle channel spur as ghost object.