Op amp Transfer function

Discussion in 'Homework Help' started by callum2510, Aug 26, 2015.

  1. callum2510

    Thread Starter New Member

    Aug 26, 2015
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    0
    Not entirely sure on how to incorporate the third resistor on the positive terminal into the transfer function? Any ideas
     
  2. #12

    Expert

    Nov 30, 2010
    16,257
    6,757
    The third resistor is not part of the transfer function. It is a DC current path and voltage reference necessary for the op-amp to function at all. R3 does not affect the gain at any frequency.

    Peek inside the op-amp and see how this works. (Pretend I drew a push-pull output on the op-amp.)
     
    Last edited: Aug 26, 2015
  3. callum2510

    Thread Starter New Member

    Aug 26, 2015
    9
    0
    I also thought the same. Just wanted to verify with someone else. Cheers!
     
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