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IWR6843AOPEVM: Fixed Signal mixing

Part Number: IWR6843AOPEVM

Is there a way to reconfigure the program on the chip to use a non-transmitted signal instead of the transmitted signal? I want to use it for Doppler interferometry. 

In other words, instead of mixing the received signal with the transmitted signal, I want to mixed the received signal with a separately generated known signal, possibly of a different frequency, weather fixed or with a slope.

Thanks.

  • HI, Peter:

    1) We can program a chirp with a certain TX enable, in this way, the device is mixing the transmit signal at the receive chain. 

    2) We can also program the chirp with no TX enabled.   In this case, the receiver is mixed with a programmed chirp, but the device is not transmit any chirp. 

    3) We do not have a way to transmit some signal, but mixed with another signal at the received chain. 

    Best,

    Zigang 

  • Zigang,

    do you have any methodology for operating 2 chips in a paired configuration, one operating in transmit only (condition 1 you list, ) , the paired chip operating with a programed chirp sent to the mixer to be mixed with the recieved signal (condition 2 you list) ? In another way of speaking, creating a heterodyne radar setup by using a pair of chips.

    Peter 

  • A second question, Can I operate the chip in mode 1 and then switch to mode 2 partway through a chip? I want to be able to operate the chip in a method similar to a gated antenna array. Can I transmit a signal, then switch of the transmitter and send a signal through the mixer to mix with the received signal so I'm not transmitting and mixing at the same time or with the exact same transmitted signal.

    It would be great if the current chip can operate like this but if the software can't, could it potentiall be reprogrammed if the hardware can still match the requirements?

    Peter  

  • HI, Peter:

    At any given time, there can be only one chirp defined for any device.   If you use cascade EVM, i.e., more than one chip is used on the EVM.  Then, you can consider one device transmit, and the other device not transmit. 

    Best,

    Zigang