SWRZ154 August   2023 IWR1843AOP

 

  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#03
    2.     MSS#04A
    3.     MSS#05A
    4.     MSS#13
    5.     MSS#17
    6.     MSS#18
    7.     MSS#19
    8.     MSS#20
    9.     MSS#21A
    10.     MSS#22
    11.     MSS#23
    12.     MSS#24
    13.     MSS#25
    14.     MSS#26
    15.     MSS#27
    16.     MSS#28
    17.     MSS#29
    18.     MSS#30
    19.     MSS#31
    20.     MSS#32
    21.     MSS#33
    22.     MSS#34
    23.     MSS#35
    24.     MSS#37B
    25.     MSS#38A
    26.     MSS#39
    27.     MSS#40
    28.     MSS#42
    29.     MSS#43A
    30.     MSS#44
    31.     MSS#45
    32.     ANA#08A
    33.     ANA#09A
    34.     ANA#10
    35.     ANA#11A
    36.     ANA#12A
    37.     ANA#13B
    38.     ANA#15
    39.     ANA#16
    40.     ANA#17A
    41.     ANA#18B
    42.     ANA#20
    43.     ANA#21B
    44.     ANA#22A
    45.     ANA#24A
    46.     ANA#27
    47.     PACKAGE#02A
  7. 6Trademarks
  8. 7Revision History

ANA#09A

Synthesizer Frequency Nonlinearity around 76.8 GHz when Synthesizer (Chirp) Frequency Monitor Enabled

Revision(s) Affected:

Description:

When the synthesizer (chirp) frequency monitor is enabled and the synthesizer chirp is around 76.8 GHz, the frequency error can be as high as 500 kHz due to coupling between the monitor and the synthesizer. The RF frequencies impacted are 500Mhz around 76.8Ghz (76.8 ± 0.5 GHz).

Implication: Increased nonlinearity in the chirp can lead to up to 20 dB degradation in the noise floor surrounding large objects. This leads to potential loss of dynamic range when large and small objects are present simultaneously.

Workaround(s):

  1. Disable the synthesizer frequency monitor during profiles where the LO crosses 76.8 ± 0.5 GHz.
  2. Use non-functional chirps to detect nonlinearities (instead of high instantaneous frequency errors) in the synthesizer by inserting dummy chirps (where RX data is not used) after functional chirps (where RX data is consumed).