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IWR6843ISK: Time synchronisation of chirps between different evaluation boards

Jonathan Jones2
Intellectual 680 points
Part Number: IWR6843ISK
Other Parts Discussed in Thread: AWR1843BOOST, , IWR6843, AWR1843

Hello,

Can you let me know if it is possible to synchronise the timing of the chirps on the IWR6843ISK boards or AWR1843BOOST boards.

I was thinking that this might be possible using the SYNC_OUT pin (AR_SYNC_OUT_SOP) from one board connected to the SYNC_IN pin (AR_SYNC_IN) on another board as described in http://www.ti.com/lit/an/swra574a/swra574a.pdf

I know that the IWR6843 and AWR1843 do not support cascade operation but I know that they have SYNC_OUT/SYNC_IN pins and was wanting to know if  these can be used for timing synchronisation between boards/chips?

Well I look forward to hearing from you.

Best regards

Jonathan

  • 0
    TI__Mastermind 18500 points

    Hi Jonathan, 

    The SYNC_IN and SYNC_OUT signals can be used for starting the separate chirp timing engines on any of the AWR/IWRx devices. The devices would need to be setup in single-device mode, and hardware triggered. From there, a separate trigger source can be used to hardware trigger all of the devices. The chirps will be synchronous to that trigger, but they will not be in phase since the chirps between devices will be generated from separate VCO. In this configuration the phase noise between chirps will be quite high. 

    The benefit of cascaded operation is that you are generating the chirp from a SINGLE master device VCO and broadcasting that 20GHz chirp LO across all devices. Since this chirp is generated for all devices from a single VCO, this provides substantial phase noise benefits over separate VCO operation, allowing the devices to perform as a single transceiver. 

    Thanks,

    -Randy