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Non-inverting operational amplifier

Introduction

This example presents the operation of a non-inverting operational amplifier.

Model description

The resistances in the non-inverting operational amplifier circuit are defined as $R_1 = 1 кОм,\ R_2 = 10 кОм$. Hence, the gain is defined as $1+\frac{R_2}{R_1} = 1+\frac{10^4}{10^3}=11$.

ampnoninv_mod_2.png

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 $0.1 В$, the output voltage increases to the amplitude $1.1 В$.

Modelling results

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

ampnoninv_graph.png

As can be seen from the graphs, the instantaneous value of the voltage at the output of the operational amplifier is amplified by a factor of 11.

Conclusion

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