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IWR1843: IWR1843 Data TX cause voltage noise

Joey Lin1
Prodigy 40 points
Part Number: IWR1843

Hi Sir:

Please provide suggestions and solutions to assist us in Pre-Production

I use IWR1843 on heartbeat detection application accuracy is not good, so we observe the waveform, we can see when Date TX(pin F14) work my power system have noticed we can see the waveform, we have the following test
1.RF open Data TX work 3.3V have noise
2.RF open Config RX work 3.3V have noise
3.RF close Config RX work 3.3V have noise
4.RF open Config TX work 3.3V no noise
5.RF open TX/RX stop work 3.3Vno noise

  • 0
    Prodigy 40 points

    Hi Sir:

    I use the heatmap to observe, we can see the video has noise shadow.

  • 0 in reply to Joey Lin1
    TI__Guru 50240 points

    Hi Joey can you clarify which software you are running on your IWR1843 device?

    Regards,

    AG

  • 0 in reply to Akash Gondalia
    Prodigy 40 points

    Hi AG:

    We use occupancy_plus_vital_signs Lab

  • 0 in reply to Joey Lin1
    TI__Guru 50240 points

    Thanks Joey

    We'll need some time to look into this, please allow a few days for a response.

    Regards,

    AG

  • 0 in reply to Joey Lin1
    TI__Mastermind 23925 points

    Hello,

    Is this on an EVM or on a custom board?

    Noise is not very important on the 3.3V supply, this supply will not impact the RF. The RF is sensitive to noise on the 1.8V and 1.0V supplies only. 

    Regards,

    Adrian