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Instrumentational Amplifier

Discussion in 'Electronic Basics' started by tuurbo46, Apr 13, 2004.

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  1. tuurbo46

    tuurbo46 Guest


    Im currently trying to alter the input impedance of an operational
    amplifier, but cant find the right page on google. I think impedance
    means, there must be an RC circuit in series with the amplifier? Does
    anybody have any ideas?
  2. Impedance is the net impediment to current. It can be a function of many
    things. It is not exclusively the result of R's and C's.
    Yes. Explain what problem you are trying to solve, don't ask questions
    on your preconceived solution to the problem. From your post it is clear
    that you don't understand impedance at all, i.e. what it even is. Since
    this is the case, how do you know that you want to "alter the input
    impedance of an operational amplifier" at all? Incidentally, this
    statement makes no sense. You cant alter the input impedance of an
    op-amp at all. You can only alter the impendence at a node that the
    op-amp is connected to. The input impedance of an op-amp, is whatever it
    is, usually Mohms.

    Kevin Aylward
    SuperSpice, a very affordable Mixed-Mode
    Windows Simulator with Schematic Capture,
    Waveform Display, FFT's and Filter Design.
  3. tuurbo46

    tuurbo46 Guest


    i will read my uni assignment again and i will get back to you with
    the correct question!

    Cheers Turbo46
  4. tuurbo46

    tuurbo46 Guest

    The above question was in relation to one of my recent uni
    assignments. The assignment was to design an Audio premaplifier
    question. The part i didnt understand and still dont is how you
    change the input impedance to an operational amplifier? I have
    enclosed the question below:

    Input 1: Design a low inpedance source(1.2k) balanced(i.e.
    differential i/p plus ground).

    At this point i choose the operational amplifier, but i was lost on
    the input impedance part. My misusderstand was that impedance was AC
    resistance, but i was wrong.
  5. Rich Grise

    Rich Grise Guest

    Howcome you can't ask your teacher? Isn't that what they're there for?

    Good Luck,
  6. JeffM

    JeffM Guest

    Input 1: Design a low inpedance source(1.2k)
    You're getting warm.
    Cold again.

    It appears you slept thru several semesters of basic electricity
    (ELC 102 AC Circuits, ELC 103 Applied AC Circuits).
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