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For application part, in inverting amplifier...it says input impedance is infinite so current in R(in) is equal to the current in R(f)
I dont get why? can someone plz explain this? :s
Input impedance is infinite means no current enters the input,
so current has just one path to follow (i.e. through feedback resistor), therefore all of the current goes to feedback resistor.
Thus, current in R(in) is equal to the current in R(f)