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A basic non-inverting operational amplifier uses just two resistors: RIN and RF which define the voltage gain of the amplifier. Unlike the basic inverting amplifier, the input resistance of this amplifier is very high.
The closed loop voltage gain is given by:
Voltage gain, AV = 1 + RF/RIN
Since the input signal is taken to the non-inverting '+' input of the operational amplifier, the output is said to be in phase with the input.
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