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Homework Help: Non-inverting amplifier

  1. Sep 30, 2010 #1
    1. The problem statement, all variables and given/known data

    How does a non-inverting op-amp circuit work?

    What happens if you make a non-inverting amplifier with Rf=Ri = 0? What would be the
    purpose of such a circuit?
  2. jcsd
  3. Sep 30, 2010 #2


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  4. Sep 30, 2010 #3
    Yes, there is a point to having R1=R2=0! You can isolate a part of a system that might need to have a certain impedance by placing a voltage buffer (sometimes also called a voltage follower) in the circuit.

    As far as how the non-inverting amplifier works, do a node-voltage analysis using ideal op-amp rules. This is one of the simplest amplifiers to solve, so you ought to know how to do it.
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