The Non Inverting Amplifier Circuit Diagram shown in Fig. 14.7 is commonly known as a Non-Inverting amplifier with feedback (or closed loop 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 of the non-inverting amplifier can be found as follows:
The closed loop gain AF = AF=Vo/Vin
From the circuit (Fig. 14.7), the output voltage is given by
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,
Generally A is very large typically 105 hence