**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.

The closed loop gain A_{F }= V_{o}/V_{in}

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

But V_{1} = V_{in }and V_{2} = V_{F}, V_{F} can be found by using the voltage divider law.

Substituting values of V_{1} and V_{2} Eq. (14.2) we have,

Generally A is very large typically 10^{5} hence A R_{1} > (R_{1} + R_{F})

Therefore,

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