Inverting operational amplifier

Introduction

This example presents the operation of a standard inverting operational amplifier circuit.

Model description

In the above model, the feedback impedance is , the input impedance is . Hence, the gain is defined as .

Since the operational amplifier block realises an ideal device (i.e. with infinite gain), the defined gain is independent of the output load. Thus, when the input voltage amplitude is , the output voltage increases to the amplitude .

Modelling results

As a result of the simulation, the plots of input and output voltages will be as shown in the figure below.

As can be seen from the graphs, the instantaneous voltage at the output of the operational amplifier is inverted and amplified by a factor of 10.

Conclusion

In the example discussed, the circuit of an ideal inverting operational amplifier has been assembled and modelled.