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LMH5401: High Frequency Single Ended Output

Ryan.Bishop
Expert 3900 points
Part Number: LMH5401

Hello,

I am trying to use 6GHz of the LMH5401's 8GHz bandwidth. We would like to DC couple the output from a TI DAC that has an internal balun.

This would be a SE input, SE output application.

It seems that it is possible to use the LMH5401 as a SE output, but that might compromise the high frequency performance we will be needing. (from this blog)

Is the LMH5401 still our best device for this? Or is there a different amp you can recommend?

Thank you!

Regards,
Ryan B.

  • 0
    TI__Expert 8540 points

    Hi Ryan, 

    In terms of speed, the LMH5401 is the highest bandwidth DC amplifier that we have, but you may run into a couple of issues here. As you've already noted, the performance drops when using a single ended output, but also the LMH5401's large signal response is only 4.4 GHz so depending on how large of a signal you are trying to send it might not hit 6 GHz. 

    Regards, 

  • 0 in reply to Jacob Freet
    TI__Expert 3900 points

    Hi Jacob,

    Thanks, that answers my question.

    A quick follow up though: Is there any other TI solution that could help here? Is this something that can be done with without semiconductors (passives, balun, etc?).

    Thanks again,
    Ryan B.

  • 0 in reply to Ryan.Bishop
    Guru 48395 points

    If the DAC has an internal balun, why do you want to DC couple. If AC coupled RF amplifiers are ok, you have lots of choices.