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 V₁ = V_in and V₂ = V_F, V_F can be found by using the voltage divider law.

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

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

Therefore,

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