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AWRL6432: Is there ground separation guide document?

Victor Park
Intellectual 1950 points
Part Number: AWRL6432
Other Parts Discussed in Thread: , AWR1843

Hello team,

I'm writing to ask your help on ground separation technique of our RADAR device. As RADAR device consumes power on chirping, it draws current periodically and it makes some noise on input power line. For example, our AWRL6432Boost EVM shows around 150mV drop noise on 5V power rail. This noise level is similar to customer's RADAR board. It looks not that much drop but this noise passes to customer's other board(SERDES module), and makes unstable operation. Especially, one of supply for SERDES is 1.0V rail and around 150mV is quite big drop. Customer is looking for some solutions like adding bead, UVLO setting but they also wants our guide on Analog ground and Power ground separation to minimize such noise. Do we have any guide document for ground separation?

Regards,

Victor Park

  • 0
    TI__Intellectual 1860 points

    Hi Victor,

    Power supply/block of AWRL6432 should be separate from the power supply of SERDES module.
    Then can you please explain what did you exactly meant by "noise passes to customer's other board(SERDES module)"

    Regards,
    Sivaprasad

  • 0 in reply to Sivaprasad K L
    TI__Intellectual 1950 points

    Hello Sivaprasad,

    As I said, they are looking for solutions for other side. Their question is about ground separation on our RADAR side. Can we focus on this point?

    To answer your question, they are checking how the noise passes to other board. I guess the noise is not caused by radiation. Their boards are connected by board to board DIP type connector which has Ground, 3.7V power, I2C signal. So far, both boards are separated each other except this one point connection. One clear point is that the noise happens on both RADAR PCB side and SERDES PCB side only when RADAR is operating. 

    Again, customer is looking for other method to reduce the noise from other side. From TI side, can we provide suggestions and guidance how to minimize noise on RADAR board power rail when chirping? 

    To avoid back and forth ping-pong, if you have other questions, let's have conf-call. I think it would be much efficient way.

    Regards,

    Victor Park

  • 0 in reply to Victor Park
    TI__Intellectual 1950 points

    FYI, RADAR PCB receives 3.7V power and SERDES IC uses 1V power. Meaning, power supply on RADAR and SERDES IC is literally separated already. 150mV drop by noise on 3.7V might be okay but 150mV drop on 1V is quite big portion.

  • 0 in reply to Victor Park
    TI__Intellectual 1860 points

    Hi Vicktor,
    Closest guide which is available is Hardware Design Checklist of AWR1843.You can refer to the GND isolation
    techniques mentioned in the Layout guidelines section. Hope this helps.
    /cfs-file/__key/communityserver-discussions-components-files/1023/HardwareDesignChecklist_5F00_V0p1_5F00_xWR1843.xlsx

    Regards,
    Sivaprasad