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Original question:

IWR1642: What is the functionality of SYNC_IN and SYNC_OUT?

IWR1642: Is the synchronization between two IWR1642 devices using a common SYNC_IN signal, accurate enough to receive and process joint reflections due to transmissions of the other IWR1642 device?

Danny Braunshtein
Prodigy 110 points
Part Number: IWR1642
Other Parts Discussed in Thread: AWR2243

Following my previous question regarding the standard deviation of RF phase differences between two IWR1642 devices, 
following a common SYNC_IN trigger:
1) Is the RF phase (and frequency) difference between the two presumably synchronized devices, small enough to enable 
     virtual channels, such that the transmission made by one IWR1642 device can be received and processed by the other IWR1642 device?
2) If so, can I cause one IWR1642 device to receive only, while the other IWR1642 transmits and receives?
3) If so, can I control which IWR1642 device transmits on which of its 2 antennas on a chirp by chirp basis?
4) If the answers to any or all the above are negative, can you recommend other TI devices which are more appropriate?

Thanks in advance.
Danny.

  • 0
    TI__Mastermind 37805 points

    Hi Danny,

    Danny Braunshtein said:
    1) Is the RF phase (and frequency) difference between the two presumably synchronized devices, small enough to enable 
         virtual channels, such that the transmission made by one IWR1642 device can be received and processed by the other IWR1642 device?
    2) If so, can I cause one IWR1642 device to receive only, while the other IWR1642 transmits and receives?
    3) If so, can I control which IWR1642 device transmits on which of its 2 antennas on a chirp by chirp basis?
    4) If the answers to any or all the above are negative, can you recommend other TI devices which are more appropriate?

    From these questions it sounds like you're actually interested in our cascade device, which has the following evaluation module.

    https://www.ti.com/tool/MMWCAS-RF-EVM#order-start-development

    You can control which antenna chirps in the configuration file that gets passed to the radar device.

  • 0 in reply to Nathan Block
    Prodigy 110 points

    Thank you Nathan.
    I will certainly take a good look at it.

  • 0 in reply to Nathan Block
    Prodigy 110 points

    Having a closer look at AWR2243, this is indeed a true cascade-able solution.
    With regard to my question I consider it a resolved issue.
    However I more questions that follow
    1) Is the 76- to 81-GHz frequency range, due to regulatory restrictions?
         Is it due to technology bandwidth limitations?
    2)  The specified range of 76- to 81-GHz implies (76 to 81)/4 GHz at the 20GHz SYNC_IN. (=19 to 20.5 GHz).
         Can I broaden said frequency range of 19 to 20.5 GHz, - injecting an EXTERNAL (chirp and frame) generator? (not necessarily of TI).    
         a) With regard to AWR2243 circuit bandwidth.
         b) With regard to antennas bandwidth. 
         c) With regard to regulatory constraints (if applicable).

    Thanks again for your answer.
    Looking forward for answers to my new questions.
      

  • 0 in reply to Danny Braunshtein
    TI__Mastermind 37805 points

    Hi Danny,

    Please open a new thread when you have new questions. This helps us keep our forum organized and allows future customers to resolve their questions faster. If you simply copy+paste this info in a new question, we will be happy to assist.

    Best,

    Nate