SWRZ071D May   2017  – December 2020 AWR1243

 

  1. 1Introduction
  2. 2Device Nomenclature
  3. 3Device Markings
  4. 4Advisory to Silicon Variant / Revision Map
  5. 5Known Design Exceptions to Functional Specifications
    1.     MSS#06
    2.     MSS#18
    3.     MSS#44
    4.     ANA#01
    5.     ANA#02
    6.     ANA#03
    7.     ANA#04
    8.     ANA#06
    9.     ANA#07
    10.     ANA#08A
    11.     ANA#09A
    12.     ANA#10A
    13.     ANA#11A
    14.     ANA#12A
    15.     ANA#13
    16.     ANA#15
    17.     ANA#17A
    18.     ANA#18B
    19.     ANA#20
    20.     ANA#21A
    21.     ANA#22A
    22.     ANA#23
    23.     ANA#24A
    24.     ANA#27
  6. 6Trademarks
    1.     Revision History

ANA#09A

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

Revision(s) Affected:

AWR1243 ES1.0, AWR1243 ES2.0, and AWR1243 ES3.0

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).