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IWR6843ISK: why there is a large DC component for IWR6843ISK?

user6378202
Intellectual 470 points
Part Number: IWR6843ISK
Other Parts Discussed in Thread: DCA1000EVM

Hi, 

1.
1.1 Hardware
IWR6843ISK + DCA1000
1.2 I use mmw without change.

C:\ti\mmwave_sdk_03_03_00_03\packages\ti\demo\xwr68xx\mmw

1.3

profile_2d.cfg
     with "lvdsStreamCfg -1 0 1 0"


2.

There is a person in front of the IWR6843ISK about 2.00m

I get ADC binary by "DCA1000EVM_CLI_Control.exe"

3.

The result show the large DC component ,profile_2d.lvds.cfg

below is the first frame range information.

4.

Thanks

PCD

  • 0
    Intellectual 470 points

    1.

    I use profile_2d.lvds.cfg as attachement above:
        it is based on C:\ti\mmwave_sdk_03_03_00_03\packages\ti\demo\xwr68xx\mmw\profiles\profile_2d.cfg
       and change with "lvdsStreamCfg -1 0 1 0", others are same.

    2.

    And the DC Component singal strength for 4Rx is different:

    certain is 4.5*10^5,

    certain is 15*10^5;

  • 0 in reply to user6378202
    TI__Mastermind 25835 points

    user6378202,

        Due to Tx to Rx coupling at the antenna and board traces, It is possible to get high DC component due to this leakage.

    You could change the HPF filtering corner frequency to reduce the DC component levels. Also you may try to increase the ADC_start time as well.

    Thanks and regards,

    CHETHAN KUMAR Y.B.