Solving for Transfer Function of Op Amp

Discussion in 'Homework Help' started by insanepenguin5908, Sep 10, 2012.

  1. insanepenguin5908

    Thread Starter New Member

    Sep 10, 2012
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    This showed up on a pop quiz today and couldn't figure it out. Been looking around on the internet and it doesn't seem to fit into a type so I'm not sure how to go about solving it. See picture. My guess was v0=-Rf/R1 + R2 but I don't think that is right. Help would be greatly appreciated!
     
  2. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    If the opamp is powered and if the input voltage fits within its allowed input voltage range then R2 does not affect the output voltage unless it is many megohms.

    It is an ordinary non-inverting amplifier.
    The output voltage is V2 x [(Rf/R1) +1].
     
  3. insanepenguin5908

    Thread Starter New Member

    Sep 10, 2012
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    Thanks for your help!
     
  4. ramancini8

    Member

    Jul 18, 2012
    442
    118
    The input current in an ideal op amp is defined as zero. The gain is then Vout= 1+Rf/R1.
     
  5. mlog

    Member

    Feb 11, 2012
    276
    36
    It's the configuration shown at the top of the page in the link below.

    http://www.allaboutcircuits.com/vol_3/chpt_8/5.html
     
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