Inverting Opamp Question

Discussion in 'Homework Help' started by rkrutz, Oct 18, 2012.

  1. rkrutz

    Thread Starter New Member

    Dec 2, 2009
    29
    1
    Hello,

    I have a question about solving for Rin. Normally when we have been given a problem to solve for Rin there is a resistor after it. In this case since there is no resistor I have assumed that Rin would be infinite, would this still be true since A is a finite gain? Since when I do the calculation A=Rf/Rin having A=10000 ohms and Rf 10k ohms so that would say Rin is 1 ohm, which I feel is too small.

    Thanks in advance for your help.
     
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