Operational Amplifier as Difference Amplifier (Voltage Subtractor)

Introduction:

Operational Amplifiers can be used to perform mathematical operations. It can also be used as voltage subtractor by adding two extra resistors to non-inverting input of inverting amplifier. Consider the following Circuit.

Expression:

                V­_out is dependent 0n both V₁ and V_2. Superposition Theorem can be used to find out V_out.

Operational Amplifier as Difference Amplifier (Voltage Subtractor)