Operational amplifier is the core component in electronic engineering and plays a vital role in various circuits. In this paper, the working principle of operational amplifier will be discussed in depth to help readers better understand the relationship between its input and output and how it affects our daily life.

The relationship between input and output

The working principle of operational amplifier is based on the relationship between its input and output. Output values of uo 1 and uo2 can be obtained by calculating resistors RF and R 1.

Concept of imaginary fault

In the process of calculating ui+ and ui-, the concept of virtual break is involved, that is, it is assumed that the voltage and current in the circuit remain unchanged. Through this assumption, we can establish a series of equations to get the value of Uo.

Simple mathematical operation

Finally, the final value of Uo can be obtained by substituting the value of U into the formula. This calculation process seems complicated, but in fact only a few simple mathematical operations are needed to complete it.