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Non inverting amplifier

Discussion in 'Homework Help' started by Wjs, Jun 1, 2016.

  1. Wjs

    Wjs New Member

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    If Rf short circuited, Vo itzzt 6V
     

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  2. ronsimpson

    ronsimpson Well-Known Member Most Helpful Member

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    Do you know the answer now?
    +input=6V
    What is Vo?
    upload_2016-6-1_20-25-29.png
     
  3. Kerim

    Kerim Member

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    As you know, in this case, the gain, Gv = V(out)/V(in+), is:
    Gv = 1 + R2/R1
    where
    R1 is the resistance between in- and ground
    R2 is the resistance between in- and output

    If R2 = 0 (shorted), Gv = ...
    V(out) = V(in+) * Gv = ...


    Another approach:
    Due to the very high gain, Gopen = V(out) / [ V(in+) -V(in-) ], of an opamp, the difference voltage at its inputs, V(in+) - V(in-), is close to zero since V(out) is usually a few volts only.
     
    Last edited: Jun 2, 2016

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