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what's the design consideration for Cout

Discussion in 'Electronic Design' started by [email protected], Aug 8, 2008.

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  1. Guest

    Here is the question: if I want to switch AC and (AC+DC) signal from a
    high speed op-amp, the output load is 50 ohm, I want to put a
    capacitor between op-amp output and the 49.9 ohm resistor, how to
    choose the capacitance?

    thanks.
     
  2. Eeyore

    Eeyore Guest

    Do you mean *couple* not switch ?

    Your question isn't clear.

    Graham
     
  3. Guest

    sorry it's a "coupling" question. I don't want both signal at the same
    time.

    this is a TIA (transimpedance), bandwidth I designed was DC-122MHz, I
    could redesign upto 500MHz.
    The cap as far as I know is small package with low inductance, other
    than that I don't know.
    How to choose the capacitance?

    If it's a load it is a pole, but right now it 's in series with the
    transmission line, any hidden problem here?
     
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