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AWR1243: Phase shifter of AWR1243P

KenF
Expert 7150 points
Part Number: AWR1243

Hello Experts,

We have questions about AWR1243P phase shifter.

(1) It is 5.625 degree resolution. Is the resolution equal interval (i.e. every 5.625 degree)?
(2) Is it possible to change the phase chrip by chrip? e.g. first chirp = 5.625degree, second chirp = 11.25degree, etc.

Best regards,
Ken

  • 0
    TI__Guru*** 149044 points
    Hi

    (1) the answer is provided in the Radar Interface Document provided in "C:\ti\mmwave_dfp_01_02_00_01\docs\AWR1xxx_Radar_Interface_Control.pdf" See Table 5:17

    (2) Phase information is provided in the profile configuration. See Table 5:19. This means that this feature is programmed as per profile not chirp. There are 4 profiles available. So, it is not possible to change the phase chirp by chirp only for each profile.

    Thank you
    Cesar
  • 0
    TI__Genius 15005 points
    Hi Ken,

    1) Yes, the resolution interval is indeed 5.625 degrees per code.

    2) Yes, it is possible to change the phase chirp by chirp. Please refer to the AWR_PERCHIRPPHASESHIFT_CONF_SB API in the ICD document.

    Also, please ensure that the phase shifter is enabled using the AWR_RF_RADAR_MISC_CTL_SB API to enable the phase shifters in the AWR1243P.

    Best Regards,
    Anand
  • 0 in reply to Anand Gadiyar
    TI__Expert 7150 points

    Hi Cesar, Anand,

    Thank you.

    Anand,

    Regarding (2), if we want to set first chirp = 5.625degree and second chirp = 11.25degree, should we use AWR_RF_RADAR_MISC_CTL_SB API twice (once for first chirp and once for second chirp)?

    Best regards,
    Ken

  • 0 in reply to KenF
    TI__Genius 15005 points
    Hi Ken,

    The AWR_RF_RADAR_MISC_CTL_SB API is a one-time API that you call at initialization to enable the phase shifter.

    The individual chirp-level phase shifter settings are done using the AWR_PERCHIRPPHASESHIFT_CONF_SB API. You can use this to program a specific phase shifter setting for each TX for a given chirp/range of chirps.

    Please go through the ICD documentation on these two APIs.

    Best Regards,
    Anand
  • 0 in reply to Anand Gadiyar
    TI__Expert 7150 points
    Hi Anand,

    My mistake...

    Regarding (2), if we want to set first chirp = 5.625degree and second chirp = 11.25degree, should we use AWR_PERCHIRPPHASESHIFT_CONF_SB API twice (once for first chirp and once for second chirp)?

    Best regards,
    Ken
  • 0 in reply to KenF
    TI__Genius 15005 points
    Hi Ken,

    Yes, you will need to call this API twice in this case.

    Best Regards,
    Anand