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inverting amplifier

Discussion in 'Electronic Basics' started by smokie, Apr 1, 2005.

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  1. smokie

    smokie Guest

    what happens if you short the output on an inverting amplifier to its
    inverting input?
     
  2. Lord Garth

    Lord Garth Guest

    Here's a place that will explain it to you:

    http://www.williamson-labs.com/480_opam.htm

    Your text indicates the feedback is zero ohms, drop that into the equation
    for an inverting amp and get back to us.
     
  3. It is programmed to have zero voltage gain.
     
  4. Bob Eldred

    Bob Eldred Guest

    Gain from the input resistor becomes zero. But, it turns into a
    non-inverting, unity gain amp relative to the plus input of the amp.
    Inverting gain = Rf/Ri = 0/Ri = 0. Non-inverting gain = Rf/Ri + 1 = 0/Ri + 1
    = +1.
    Bob
     
  5. Active8

    Active8 Guest

    It always amazes me... the little things you can learn from the most
    basic books and articles. Like... no one ever told me god created
    PNP transitors. Is this more persecution, Dr. Laura, and how should
    I smite them?

    Seriously, I have a real basic book which wouldn't have taught me
    much except that it has a chapter on components. Different types of
    Rs, Cs, etc. Or there's my physics book that's short on words and
    big on equations contrasted with an EE series (9 volumes) which
    covers 1st year physics with more explanatory words. It just adds a
    bit.
     
  6. Rich Grise

    Rich Grise Guest

    You get a zero-gain inverter. I saw one of these in use once, and
    my engineer was baffled by it. "What the heck is a zero-gain inverter
    for?" and you could almost see the question marks around his head
    like in the cartoons.

    It provides a virtual ground. I believe that the reason for doing
    it that way has something to do with temperature compensation or
    input offset current of the downstream devices.

    Or, if you lift the non-inverting input, it's a voltage follower.

    Cheers!
    Rich
     
  7. smokie

    smokie Guest

    Thank you everyone
     
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