Quick question about op amps

Discussion in 'Homework Help' started by de1337ed, Feb 27, 2012.

  1. de1337ed

    Thread Starter New Member

    Mar 6, 2011
    23
    0
    I'm referring to the following image:
    [​IMG]

    This is a general op amp, I was wondering what the gain would be if R2 didn't exist, and it was just a feedback loop with r1?
    I assume that it's the same as a unity gain buffer right? So Av would just be 1?
    Thank you.
     
  2. jimkeith

    Active Member

    Oct 26, 2011
    539
    99
    you are correct--Av = 1
     
  3. crutschow

    Expert

    Mar 14, 2008
    13,018
    3,235
    The formula tells you that. Av = 1 + R1/∞ = 1. (Mathematically the limit value of R1/R2 is 0 as the resistance of R2 approaches open circuit/infinity).
     
    Last edited: Feb 28, 2012
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