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Closed Loop Gain of Non Inverting Amplifier:

The circuit shown in Fig. 14.7 is commonly known as a Non-Inverting amplifier with feedback (or closed loop Gain Non-inverting amplifier), because it used a feedback and the input signal is applied to the non-inverting input terminal of the opamp.

Closed Loop Gain of Non Inverting Amplifier

The closed loop gain AF = Vo/Vin

From the circuit (Fig. 14.7), the output voltage is given by

Closed Loop Gain of Non Inverting Amplifier

But V1 = Vin and V2 = VF, VF can be found by using the voltage divider law.

Substituting values of V1 and V2 Eq. (14.2) we have,

Closed Loop Gain of Non Inverting Amplifier

Generally A is very large typically 105 hence A R1 > (R1 + RF)

Therefore,

Closed Loop Gain of Non Inverting Amplifier

Therefore, the closed loop voltage gain for an non-inverting amplifier is

Closed Loop Gain of Non Inverting Amplifier