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LMH6559: Snubber Circuit for LMH61559

Jehangir Parvereshi
Intellectual 510 points
Part Number: LMH6559

We plan to operate the LMH6559 at frequencies ~1.2 GHz.

Is there a need for snubber circuit to avoid stray coupling in to output at > 1 Ghz?

Thanks.

JP

  • 0
    Intellectual 510 points
    A few more details. Using it in direct coupled mode and operating with split supply rails: +5,-5V. The input signal is 0 -1.8V low frequency clock with superimposed 500 MHz - 1 GHz noise (-40 dBm) spectra.
  • 0 in reply to Jehangir Parvereshi
    TI__Genius 15975 points

    Hi Jehangir,

    If you are only planning to buffer the 500MHz to 1GHz -40dBm noise spectra that is riding on top of the 0-1.8V low frequency clock signal, then I think operating the LMH6559 in dc coupled mode and +/-5V supply should be okay. However, I don't think that the LMH6559 would be suitable for large signals (>0.4Vpp) in the 500MHz to 1 GHz band. I don't think you would specifically need a snubber circuit at > 1GHz as the buffer frequency roll-off should take care of any spurs beyond the -3dB bandwidth of the part.

    Best Regards,

    Rohit