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Inverting Operational amplifier

  1. Feb 19, 2007 #1
    1. The problem statement, all variables and given/known data
    1) Consider an inverting operational amplifier as shown in figure. Suppose R1= 1000 ohm & Rf = 10^6 ohm. It is said that the input impedance=R1=1000 ohm and the Output impedance= 0.

    2) Consider a non inverting operational amplifier as shown in figure. Suppose R1= 3500 ohm & Rf = 15000 ohm. It is said that the input impedance=infinite. Why is it so? Here Rf is the feedback resistor.But only for an ideal Op-Amp, the input impedance is infinite and not for a real one, isn’t it? So, can R1 be taken as the input impedance of the Op-Amp in both cases?


    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

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  3. Feb 19, 2007 #2

    ranger

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