SWRZ115B March   2021  – May 2024 AWR1843AOP

 

  1.   1
  2. 1Introduction
  3. 2Device Nomenclature
  4. 3Device Markings
  5. 4Usage Notes
    1. 4.1 MSS: SPI Speed in 3-Wire Mode Usage Note
  6. 5Advisory to Silicon Variant / Revision Map
  7. 6Known 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
  8. 7Trademarks
  9. 8Revision History

ANA#08A

Doppler Spur Observed at Certain RF Frequencies

Revision(s) Affected:

AWR1843AOP ES1.0

Description:

When the instantaneous FMCW Ramp frequency nears certain specific RF frequencies, there can be coupling between the synthesizer's reference and its output, and manifest as frequency glitches or spurs in TX output spectrum.

Implication: In FMCW radar 2D signal processing, this can lead to spurs in a fixed Doppler bin at all range bins. This situation can occur with narrow band chirps, if the FMCW ramp includes or nears 76.8-, 77.4-, 78-, 79.2-, 80.4-, 81-GHz RF frequencies. The affected Doppler bin is a function of chirp timing and RF frequency properties.

Workaround(s):

Use the device's dithering features to vary idle time, RF frequency and ramp end times to spread the spurs significantly in Doppler dimension so that it does not get detected as spurious targets. Using larger chirp band widths also reduces the spur level.