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Does TI have reference design for differential Probe AFE application

Jimmy WANG
Genius 4685 points

Hi team,

Does TI have a reference design for differential Probe  AFE application? thx 

Spec as below.

  1. Input Resistance/Impedance: 1Mohm||<1pF
  2. Analog BW: 1~2GHz
  3. Input Differential Voltage Range: ~ +/-5V
  4. Common Mode Range: +/-8V or Same as above
  • 0
    Genius 4685 points

    hi team,

    Any someone can reply to my question?

  • 0 in reply to Jimmy WANG
    TI__Mastermind 45670 points

    Hi Jimmy,

    I think this might be in the wrong forum. I am moving this to the amplifier group.

    Regards,

    Rob

  • 0
    TI__Expert 8720 points

    Hi Jimmy, 

    We don't currently have a specific reference design for differential probes, however I can suggest some parts that may work. 

    The biggest challenge with the specs you listed is finding a part with the needed common mode range that also has enough speed and low input capacitance. Typically higher voltage transistors have larger capacitances. 

    If you can use a part with a lower voltage input, two OPA859s in a differential configuration may work well for this application. Although they are only 5V parts, they are 1.8GHz unity gain bandwidth and 0.8pF input capacitance. 

    Regards, 

    Jacob