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LMH6629 Signal Routing

Peter Gatchell
Intellectual 260 points
Other Parts Discussed in Thread: LMH6629

Hooman,

For the LMH6629 layout, I plan to clear the ground plane directly underneath IN- and IN+ to minimize input capacitance relative to ground. This is for the entire front-end circuit that feeds IN- and IN+.

For the output, I have a series R feeding into a second stage LMH6629. Here I am not clearing the ground plane directly underneath the circuitry, there is a ground plane from the first stage output all the way to the input of the second stage LMH6629. This trace capacitance to ground will tend to roll the frequency off ever so slightly.

For maximum bandwidth, would you recommend removing the ground plane directly underneath the signal feeding the 2nd stage?

Thank you for your feedback.

  • 0
    TI__Mastermind 22825 points

    Hi Peter,

    In my opinion, keeping ground plane away from all sensitive nodes make a lot of sense. The only reason you may keep the ground plane under the output trace feeding the 2nd stage would be to somehow keep a controlled impedance (in case there is "significant" distance (>1 inch) involved?) to minimize signal reflection. Keeping the distances as short as possible is also a good thing.

    Regards,

    Hooman