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AWR1243: AWR1243

tom daglas
Intellectual 440 points
Part Number: AWR1243

Hello

I have a question about the Cascaded AWR1243 system. we have two AWR1243 which one is Master and other is Slave.

1-Duo to MIMO radar technology, which at one chirp turn on one transmitter with all the receivers together , and the next chirp, next transmitter with all receivers,we don't length matching Tx1, Tx2 and Tx3 of AWR1243 Master and Tx4, Tx5 and Tx6 of AWR1243 Slave.

We do length matching for Rx1,2,3,4 of Master chip and Rx5,6,7,8 of Slave chip.

Does this damage radar correct operation? 

2- The layer 2 is RF ground. below the antenna pins, there are balls with 20mil diameter.

Does cascading system need these balls below pins of D1(FM_CW_SYNCOUT) in Master chip and D15(FM_CW_SYNCIN2) in Master and Slave chips?

3- The layer 5 is dedicated to GND. But I had to put a 1.8v (IO) trace in a little space on this layer. Does this make a radar function correct?

Thanks for your attention.

  • 0
    TI__Guru 58035 points
    Hello ,
    Please find my reply below:

    >>1-Duo to MIMO radar technology, which at one chirp turn on one transmitter with all the receivers together , and the next chirp, next transmitter >>with all receivers,we don't length matching Tx1, Tx2 and Tx3 of AWR1243 Master and Tx4, Tx5 and Tx6 of AWR1243 Slave.
    >>
    >>We do length matching for Rx1,2,3,4 of Master chip and Rx5,6,7,8 of Slave chip.
    >>
    >>Does this damage radar correct operation?

    <TI> It might make it easier at system level if you length match the TX lines. But you could also calibrate out the length mismatch at system level by measuring the frequency and phase difference between the transmitters by keeping a corner reflector at fixed distance and zero angle. Measure the reflected signal on the RX channels with different transmit channels and estimate the frequency and phase difference between the TX channels. Once estimated this mismatch can be compensated for in the processing.

    2- The layer 2 is RF ground. below the antenna pins, there are balls with 20mil diameter.

    Does cascading system need these balls below pins of D1(FM_CW_SYNCOUT) in Master chip and D15(FM_CW_SYNCIN2) in Master and Slave chips?
    <TI> If you are using the same stackup as the TI EVM (RO4835 4mils or RO3003 5 mils) then the L2 GND cut below the RF balls is needed for better RF matching.

    3- The layer 5 is dedicated to GND. But I had to put a 1.8v (IO) trace in a little space on this layer. Does this make a radar function correct?
    <TI> I would not be able to comment that. It would depend if you have any critical signal on L6 which needs proper GND reference. If that is available around these critical signals then in other portions you could afford to route other signal like 1.8V.

    Regards,
    Vivek