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AWR1243: Phase shifter switch time and loss

James Austrial
Expert 4030 points
Part Number: AWR1243

Hi,

AWR1243 has Tx Phase Shifter, and Binary Phase Modulation. That can be used for beam-forming control.

My questions are:

(1) What is the switch time from one angle to other angle after we change register? That means: How long does it takes to settle down angle change?
Is it a fixed time or it varies depends on conditions?

(2) Will energy loss be equal across 360 degrees? or different angle has different energy loss?

  • 0
    TI__Guru 58035 points
    Hello James,
    The AWR1243 device has only the BPM feature (ie 0 or 180 deg phase shift). The fine controlled phase shifter is not available on AWR1243. It would be available on the AWR1243P device which would be launched soon.

    I will get back to you on the specific query you have about settling time.

    Regarding the power loss across different angles, are you referring to the antenna pattern? The antenna gain would be different at different angles and this would depend on the antenna design. For the antenna thats present on the TI EVM gain across angles can be found in the EVM user guide ( www.ti.com/.../swru507.pdf).

    Regards,
    Vivek
  • 0 in reply to Vivek Dham
    TI__Expert 4030 points
    The angles here means the "phase angle". For example, we can configure TX1 as 0 degrees phase angle and configure TX2 as 180 degrees phase angle. For the same TX, if configure different phase angle, will power loss be different? or they're the same?
  • 0 in reply to James Austrial
    TI__Guru 58035 points
    Hello James,
    We have seen slight difference in power levels between the 0 and 180 deg phase settings, < 0.5dB difference.
    Regarding the time required for the phase settling, the change in phase is done in the idle time and hence the phase gets settled before the ADC start (point where the valid ADC sample are available). So no additional time is required for the BPM settling.

    Regard,
    Vivek