Operational amplifiers are used in many circuits - one of the main applications is in amplifiers. Here the operational amplifier gain is of key importance.

Although there are both inverting and non-inverting amplifiers which have their own calculations, there is a generic equation for these circuits. The generic formula can be used to develop the equations for the inverting and non-inverting configurations.

The gain of these operational amplifier circuits is governed by the level of negative feedback. Applying negative feedback provides a defined level of gain, wider bandwidth, lower distortion as well as a number of other advantages. However it is often the operational amplifier gain that is of major importance.

When looking at the inverting amplifier circuit, the equation for the circuit can be calculated from the simple formula Av = R2/R1.

For the non-inverting amplifier the gain is slightly different and can be calculated from the formula Av = 1+ (R2/R1).

It is also possible to use the non-inverting amplifier as a buffer amplifier with a unity voltage gain by looping the output back to the inverting input, i.e. R1 = infinity and R2 = zero. In this way the voltage gain can be calculated to be 1.

So in summary both inverting and non-inverting amplifier gain is easy to calculate using the simple formulas.

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