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OPA856: 90MHz sinewave at voltage follower

Yasushi Fujiwara
Genius 11755 points
Part Number: OPA856
Other Parts Discussed in Thread: BUF602, OPA695

Hello Experts,

My customer would like to design a voltage follower circuit for 90MHz sinewave input signal(3~4Vpp). I think OPA856 is one of candidate, but I would like to ask you that you have other recommended device. Do you have any other recommended device?

Best Regards,
Fujiwara

  • +1
    Guru 47495 points

    Well Yasushi, that unity gain stable OPA856 looks promising, but probably too low on slew rate. 

    A 90MHz 4Vpp sine wave requires a minimum SR of 1130V/usec and the OPA856 only has 350V/usec.

    And, you will need some margin to make sure the signal comes through clean, maybe a minimum of 2000V/usec. 

    Not sure there is anything like that on single 5V supply

    If +/-5V is ok, look at the

    BUF602

    And then most current feedback parts can make pretty good buffers, 

    OPA695