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DS30BA101: Impact of ground baunce

na na78
Guru 16770 points
Part Number: DS30BA101

Hi

We are considering remote gate driving of FET.

A length of cable would be 3 meter.  Signal is 100MHz pulse.

As one of cases, following is our assumption.

If gate is driven, 50A current will flow instantaneously. (20nsec to 50nsec )

So we concerned that ground bounce due to instant current flow would be impact to pulse signal if any.

We assume single-ended transmission with coaxial cable but it is not decided.

Actually, what do you think of this configuration?  Is there any other concern?

BestRegards

  • 0
    TI__Mastermind 43795 points

    Greetings,

    It is possible there will be some GND and power supply movement.  I would try to provide local filtering to these areas on the EA101 to help stabilize the device.  You could use ferrite beads and local capacitive decoupling as well as local power supply regulation to give several layers of filtering.

    Gate drivers usually require a larger input swing.  I would double check that the 400 mV swing on the OUT+ of the EA101 will be enough.

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    Guru 16770 points
    Hi Lee

    Thank you.

    As you said, the issue of output swing you pointed out had violated specification of gate driver.
    2.1V was required as Vih. So I have to review.

    Normally, what is the good way to extend transmission distance for analog signal?
    It is simple pulse signal for driving gate.

    BestRegards
  • 0 in reply to na na78
    TI__Mastermind 43795 points

    Hi,

    In this case I think you could drive a signal across the coaxial cable directly with a LVCMOS signal.  The attenuation at 100 MHz will not be enough to reduce the amplitude.

    Regards,

    Lee